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How to Sex Marijuana Plants

Marijuana Preflowering

Although generally considered one of the trickiest parts of growing your own marijuana, sexing is quite straightforward and will become easier as you gain more experience. The reason for sexing your plants is so that you can remove male plants before they have a chance to pollinate the females. If this occurs the females will start to develop seeds and this will divert their energy from THC production. Pollinated weed is still smokable, we’ve all had weed with seeds, but the potency will be significantly decreased.

Careful observation of flowering is the only true way to sex your plants, although you may get a clue from their growth patterns. Male plants tend to be leggier than female plants with a longer internodal length. Female plants are squatter with more leaves and a bushier aspect.

Towards the end of the summer, as the hours of daylight decrease, changing light levels will trigger your plants to produce flowers. The appearance of pre-flowers at branch junctions is what you are looking for.

Male pre-flowers should be clearly visible to the eye, although a magnifying glass will make your job easier. Male flowers form at the junctions of the branches and stem and the pollen sacs form little balls.

How to sex marijuana plants

Female pre-flowers will also form at the junction of branches and stem and will normally start to form at the fourth or fifth branches up from the base. They are easily distinguished by the appearance of pairs of tiny white hairs, known as pistils.

Marijuana Preflowering

At this stage your plant is just about to enter the flowering phase of growth and now is the time to remove the males if you wish to.

Flowering

As the plant enters the flowering stage its growth patterns and nutrient requirements will change. The vigorous vegetative growth will slow, stems will elongate and flower formation will begin rapidly at first before slowing. Your plant now needs less nitrogen but more potassium and phosphorous so now is a good time to add some ‘super bloom’ fertilizer. Follow the packet instructions for fruiting or flowering plants.

Flowering

The female flowers will start to form kolas around the branch junctions with a main one at the growing tip of the plants. If you look closely you will see the seed pods and these will swell; either with seeds if your plant has been pollinated or with THC as false pods if you have removed the males.

Kolas

As the flowers become ready for harvest the pistils will darken and the seed pods will be swollen and sticky with resin and THC trichomes.

Ready to harvest

HowtoGrowMarijuana.com has a wealth of information for growers. We hope you now understand how to sex your marijuana plants. It might be worth reading some of the questions and answers made by our visitors below.

 

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How to Grow Marijuana Forum - Growing Marijuana Indoors & Hydroponics

95 thoughts on “How to Sex Marijuana Plants

  1. I have one plant that has the female up top but at bottom it has male parts im tryin 2 figure out if it a female male or hermaphrodite

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  2. Would someone mind helping me classify my plants either male or female. I have 4, one is definitely female with the white hairs..but the others look as though they are growing the same white hairs at the end of little sacs. I’m confused as frick, this is my first time growing. Thankyou :)

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  3. hi,im jakes from namibia africa..i just planted my seed now with a river pit soil and i hope it will grow outdoor…but it not ligile in our country

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    • Elsie ChipOil

      Be careful Jakes. It would be horrible to get caught there.

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      • It’s illegal here in the us to…. Well most of it, espically if you on gulf coast

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  4. Hi all,

    I found wild plants and need a little help!

    Okay I live and work in China as an English teacher with my partner. I live in the south in a small school about 40 minutes walk outside of the town, and we were walking into town for dinner yesterday and came upon 4 wild plants just growing on the side of the road.

    We are trying to determine wether it would be viable to take the plants and replant on our balcony (no one would see because we overlook a mountain and we are the only foreigners in town so not a large social life!) have photos of the plants, but because it’s December I can’t really tell if they are male/female/bisexual …

    Also we want to act on this ASAP because, as the school is still being built, there are a lot of workers around at the moment and we know for a fact they have been smoking … Have come back from class a few times and smelt that sweet sweet aroma with enormous feelings of envy! So we know that someone knows what they look like (and maybe these are the workers plants) and we don’t want to miss an opportunity! We’ve been here 3 years and I’m sure you can imagine what 3 years will do to someone when they love and appreciate the beauty of this plant.

    Any advise would be greatly appreciated! And apologies for the very large post!! Can forward pics if necessary. We are planning to go down tonight and further investigate under the cover of darkness, so as to avoid the suspicions of two foreigners paying very close attention to a bunch of plants on the side of the road!!

    Thanks in advance!! (happy growing to all!!)

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    • i am sorry i only came across this site now…. if i was you i would take them and replant them…

      i am also an English teacher in China (Shaanxi Province). i moved here just over a year ago… i made a few friends that managed to bring me a parcel of “leaf” – the main stuff we get here where i am is what they call “hash” (fine powder – mid to dark green in colour)

      anyway back to my story … from the parcel i managed to save 7 seeds . when i planted them only 1 has grown ( i am hoping the plant will be bisexual – so i can eventually cultivate more) its gonna be a long process but i am willing to torture myself now for the great rewards in the long run

      if you have taken the plants already and are happily growing them at home

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    • Omg,u sound like a shill so the legit cause of marijuana/ cannabis is demonized.Your representing the USA teaching in a foreign country an like to know how to make a wise an proper decision?Quit teaching anmove to seatle or the parts of Denver where they need schooling.

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  5. First year, first time grower…. Indoors
    Plant started in May and is 3 ft high.
    Thick leaves, oak size trunk and stems, BEAUTIFUL buds… and it seems VERY healthy…
    Used a combo miracle Grow cactus (for drainage) and miracle soil, as well as fert….
    So, now the bud trichomes are turning red….
    Where do i get the ph balanced water for flushing… I have to be close to harvest..?
    Help?

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    • Its probably rag/dirt weed. Filled with seeds and will give you a bad head ache. Odds of finding a grade weed just growing on the side of the road are slim to none.

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    • Collect rainwater. This is usually very pure. pH is normally a little less than 7 due to pollution and natural CO2 in the atmosphere. But in the absence of the pH balanced water you refer to. it would certainly help.
      Tap water can also be left to stand for a day or two to allows contaminants to either settle or evaporate.

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  6. how do you know when to take male away from female,to have no seeds?

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    • as soon as you know it’s a male ….it’s taking up space and it may be keeping your girls from more light

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  7. Is the girl scourt cookie with seed? I have the cookie flowering for ten weeks and now I get the harvest. But my staff come with some seed in the flower

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    • No, none come with seeds. Seeds are produced when the female plant is breed with the male plant.

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  8. This is my second year growing. Last year I ended up with one female, and I had planted it too late to get the full grow season. This year I set them out the first week of april and they are 2 plants 9 feet tall. One has wierd leaves. they look like weed the whole way but the leaves are kind of webbed, almost like a maple leaf. I know it is marijuana, you can tell from all the buds, but the leaves are deformed. has anyone else had this happen to them before?
    I also woukld like to know the best way to cure it. Last year it smelled a little homegrowny and I want it to smell skunky, what can I do?

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    • Paw Paw Poppie

      The smell come from which strain it is, you can not change the smell. The leaves grew like that from the genics of the strain, nothing you can do. Just finish it out.

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  9. I have grown about 24 plants all over 10ft tall growing outside, the only problem i have with detection is other pot heads finding it and stealing it. My concern with my babies is that i cant figure out how old they are and when should i harvest. A quick Answer to my questions would be VERY much appriciated! thank you fellow farmers.

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    • Michael Hardie

      The idea is NOT to see how tall you can grow the plant. Much better is to use the power of threes. By this I mean cut or “pinch” the tops as they grow. The first set of small round leaves do not count. The next set of leaves that grows on the young plant will look like real marijuana leaves with the jagged edges. The next will be your “second” set. When the third set grows out enough to have a small stem it is time to pinch the top. Use a razor blade or small sharp scissors (I prefer the scissors). This will result in two new sets of branches to replace the one. This means your plant will become wider and not as tall. You repeat this process on the the two new branches. Allow the next set to grow on each one. Then the second. And when the third grows out enough to have a bit of space on the stem then pinch them like you did on the first step. Repeat this one more time. Three sets of new leaves on the new branches and pinch the third. This will result in a bushier plant, give you more buds and allow the plant to put it’s energy into the buds as opposed to just making it taller. It is also much harder to detect as it is not so tall and resembles other plants more so than a plant that simply grows tall. In simple terms, you cut the third set of leaves at the stem and you do this three times. The power of the triangle. I got this tip from a real pro. And it really works.

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    • Paw Paw Poppie

      You will not be able to tell their age. Get a jewers loop and check the trics when they are 25% to 50% amber its time to harvest.

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  10. To The Daddy. I’m a first time grower anything that u can suggest.? plant is about 6inchs high

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  11. well How about use water and water you mother ******s, Thats how they grow in the wild why the f**k adding s**t is going to make them better,bigger,stronger its all crap, LIGHT,WATER and TLC and end result will be a pure non toxic other than weed it self smoke. Come on stop feeding ppl crap. PEACE

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  12. you can get some CFL lights for about $16/ea. at lowes,home depot or any hardware store. Get the 65watt bulbs but a 65 watt cfl is like a 300 watts and they energy savers…hopes this helps

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  13. I never had my buds tast like crap when i used bat shit nor when i used fish did they tast like fish LOL.

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  14. Senior weedman

    Could bat guano used to help flowering cause bud to taste like crap also? But it is dry and sets 24 hours in a gallon of water. Once a week feedings.

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  15. So can anyone tell me what the odds of getting a female? I started 12 plant which is my limit in the state I live in, I just hope I don’t get all male’s. by the time they sex it will be so late in the season starting more will be useless.

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  16. I am trying to grow indoors & can NOT afford grow lights. Do I stand a chance of growing anything or am I wasting my time ? I have one that is at least 6-7″, and I put some seeds outdoors in little plant starters. I could NOT believe how quick they sprouted & afew of them the leaves are HUGE. Help me to take care of them. I live in a HOT town & I am afraid to put them in direct sunlight. And if I put them in DIRECT SUNLIGHT, should I do it early before it gets too HOT? HELP ME PLEASE !!! Thank you BIG TIME!

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    • WATER WATER WATER WATER WATER–SUNLIGHT SUNLIGHT SUNLIGHT–SEXING SEXING SEXING
      GOD OR MOTHER EARTH OR WHOMEVER GAVE US THIS WONDERFULL MEDICATION THAT IS SO SIMPLE THAT IT IS DIFFICULT… I AM SO SORRY THAT YOU ARE HAVING A ROUGH GO AT IT… GO TO http://WWW.ONLINEPOT.COM AND CHECK OUT WHAT OTHERS GOING THRU WHAT YOU ARE GOING THRU ARE DOING. I CAN NOT STRESS ENOUGH ON WATERING BUT NOT OVERWATERING… HOPE THIS HELPS…I WISH YOU A WONDERFULL GROW… AND DO NOT WORRY YOU WILL INDEED HAVE SOME YUMMY BIG FAT WONDERFULL BUDDAGE(I JUST KNOW YOU CAN DO IT…)
      MOST GRATEFULL,
      PERK1
      SORRY ‘BOUT THE “ALL CAPS” I PROMISE I AM NOT YELLING. I AM JUST SO STONED FROM THIS DADGUM *A.S.H.* FROM “MR. NICE SEEDBANK” THAT I AM TO LAZY TO RE-TYPE–PLEASE, KNOW THAT *A.S.H.* DOES THIS TO A FELLA…CERTAINLY NOT FOR THE FAINT AT HEART…

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  17. So I heard that after a plant gets so big u shoulders pinch the top off is this true and what? Or how much? Do u pinch off?

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  18. GREAT ADVICE GOOD WAY TO REMEMBER AND BEST TO CATCH ‘EM EARLY!!

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  19. Cool thanks, actually that almost exactly the ratio I got. I bought Super Bloom from home depot. They seem to be flowering pretty good now. Thanks again.

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  20. Hey Bastardo, you want a nute that is rich in phosphorous. All the hydro nute manufacturers sell them as ‘bloom’ or ‘flower’. If you are buying from a garden shop look at the NPK code on the side. You want a high middle number, something like (very approximately) 10-50-10.

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  21. Ive been using a basic 10/10/10 during veg state, indoors under about an equivalant of 600watts, I have 6 plants, and they have been growing pretty decent. I am now switching to 12/12 light cycle and I was wondering if it is necessary to also Switch to a fertilizer without nitrogen. Ive already switched my cfls to 2500k bulbs and have approx 750watts. Does this sound ok? First time grow and so far going good.

    switch to a nute without nitrogen, ive read to do so. Ive switched to the 2500k cfl’s for flowering, and I have about 750 eq watts

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  22. Normally 3-10 days but I am no expert at seeds but I believe you would want to wait to give your plants any nutrients until they are bigger, honestly after you get some females get yourself a clone bucket and clone, it’s much quicker with no chance for male plants if you want a fool proof cloning method that will net on average 85-100$% success rate I’d be Willing to help

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    • ….YES… I WOULD LOVE SOME ADVICE AS EVERY CLONEING I HAVE TRIED TO DO DIED:(

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  23. i just planted my seed a few mins ago and iam an newbie to this how many times do i need to water it and how long do i have to wait to see results and i also put so miracle-gro on it is that going to affect the plant its orchid food but iam trying to grow a cannabis plant need info

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  24. It’s easy to tell, the females seem to have 1-2 thick hairs on each side of the node aka primary to secondary branch intersection and males have round balls that turn into polen
    Once u complete vedge cycle and have grown your girls to the size you want then switch your lights to 12on 12off by week
    3so or so on a predominantly indica fast growing plant you should have dime to quarter size puff balls
    the fastest flowering plant I know finishes in 6 weeks
    when the hairs are 40-60% red on most plants and the tri combs are half milky half amber it’s time to harvest
    Get good at reading your plants!
    I water about every 30 hours in 3 gallon pots but ultimately the weight of the pot and how the plant looks determines watering
    good vedge food is grow terra and good flower Food is bloom terra and you can add other nutes if wanted
    Use a heaping 1/3 cup to 5 gallons of water that will do ten plants in 3 galon pots and always watch for burnt leaf tips this means you’re over nuting fwiw

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  25. Hey, I’m growing Swiss miss, New purple power and Holland’s hope, I am going to need more seeds for next year but of course I need some good smoking material. How should I proceed?

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  26. i have been growiong for 2 months now my plants are in a hydro system the roots are growing in the water and they are very big and long i check the PH leve; everyday and change the nurtinates and water every 5 days they are at least 2ft tall when will they start buding they have started growing alot of hairs on the stems and they are begining to smell rank.

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  27. der are round balls near d stem,wid seeds in em jus lik d one’s in bud.is it a male,female or Hermaphrodite???

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  28. Have a question if someone could Please take a few minuites for a reply.
    Now I live near NewEngland where it is about 50degrees these days in April but its freezing somedays then warm others.I have 2 pots one has 2 plants in it which is a 5gallon bucket.The 2 fermenized seeds allready sprouted,they both are looking good.In my other 2 and a half gallon is prob a 5-6′ and a 4-5′ so there in there very early stages.
    But I’m trying to keep them inside because I wanted to start my grow process even though the weather.Now in a month or so when the weather starts to get A lot Hotter and Nicer is it perfectly fine to bring these indoor plants outside.What stage can it be to grow indoors then transplant to outdoors.Smoke uP!!!

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  29. so i have a plant going as of right now an i have 3 or 4 branches of three an just got my first 5 fingred leaves ,
    an inbetween my branches i have little leaves growing IS it female ???
    CAN ANY body help me with this question it smell like some dank its my first grown i dont see any little balls between any branches yet tho so thats a good sign

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  30. hey how do i identife a malefemale tree a tree that makes both buds and male flowers

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  31. Do you think you can determin sex early, like 5 inches tall by the direction of the bigger leaves. I notice some leaves are north to south and others are east to west. It might be an indicator, do you agree?

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  32. mid January started plants in “Aeroponics” indoor system. I just changed light cycle, so hope for nice crop. 2 plants… one a clone of the mother, the other a seed from same plant. White widow.. the new plant is producing nine-bladed leafs! Today; this plant is 5 feet tall,the clone about 4-1/2 feet tall.

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  33. Hi I’m a newbie with 7 plants in 4′ x 4 ft. closet is that enough space, also when do I start sexing the plant they are 2″ to 4″ in.

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  34. mistermac, wait til evening one hour before dark. You dont want to hurt those presious babes.You want to be able to see what you are doing.
    Take A shovel, stay six inches from the plant.Make A circle around the plant. then ever so gently push the shovel under the plant and pry up. Pick up the ball and transplant to your planter. Make sure there is fresh dirt under the roots in the potter.Water imediatly with A rooting solution, to remove air pockets. I sujjest you wait till dark to bring them in your house.

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  35. Jerome you have what they call a hermaphidite plant. It will have rhe male pode and thisles with white hares. you dont want that plant in your garden.I hope you have only one, they are pretty rare.

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  36. It usually takes stress to cause a mutation that signifigant. It must be warm where you are. You should watch yours real tight when sexing though. January is a 12 hour light month so you did experience some form of stress. even now there’s probably only 14 hours of light a day. I would think your plants would have started flowering right out of the pot. I know they didn’t but your veg stage had to be something less than standard start. Take that shit indoors and you play mother nature. Good luck brother.

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  37. i am interested in what technique you used this time around to have such healthy and fast producing plants.Any advice you could give me would be so greatly appreciated .
    I like yourself had a fairly good season last yearw5 mp.But with the time and energy used I felt with a little more research I probally should of done several things different,including my soil,and quite honestly several more things.
    normally I never send or ask for information on something this personal But after reading your post i really couldn’t resist not trying to seek any help you might could give me.Thanks so much for your time.and information you’ve already posted.

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  38. I planted late in january, but doing well in pots outside.I have heard that females can change sex to become males and pollinate the other females.Any truth in this?

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  39. If ya want to grow a shorter plant loaded with buds apply some PIX Not only for shorter plants also it will change the IR signature Triple super phosphate will increase the yield Dap is great also cheers

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  40. hey listen i got a little plant its growing taller except more leaves its a week or more now so help me out

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  41. im going to put this straight in order to see if there male or female they need to be well on there way to flowering
    to start that you need 12 hours of light 12 hours of dark and for you biginers simple plant food is a good place to start when vegetatin which is 18 to 24 hours of light per day
    warning when flowering no fertilizer or your bud will tast like shit

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  42. ive got some plants going but i would like to no if mi plant is male or maf i have seeds pods on mi buds but no where eles

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  43. hello i live in holland moved here from the statesi have a plant that is 6feet tall.and buds just starting its end sept and my plants just started budding how much longer. before i can cultivate. worried about frost.

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  44. thnx man ive been growin regs since may now its september nd i think its starting to bud yeay

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  45. Hi guys … try this… when the plat is still very young ( months before the “balls” appear ) look where the branches intersect the stem. You will see 2 (two) tiny shoots on either side of the stem. On a male plant they will try to cross forming a “X”. If the shoots grow away from each other they are girls. ( I remember this because a girl has to open her legs to become pregnant ) I don’t mean to be crude and I hope I didn’t offend anyone. Good luck. It’s almost the start of the season here so I’ll let you know how I get on.

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  46. ok here is my issue and im open to responses from anyone that sees this.. I recently received a plant already grown, the smell is very strong with this one..Its about to 2ft tall.. leaves are thin and long. I see the female hairs that i read about here.. i wouldnt say im growning indoor.. i have a big balcony that gets sunlight from 10a-6p during the summer and about an hour less during the Fall..

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  47. My plants are outside in the backyard.The tallest is about 27 inches.They are on my deck which gets alot of heat. Is that ok? Also what should I use as a fertilizer to produce a great plant. This is my first time growing. Thanks.

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  48. i’m having a hard time determing how to tell the sex. my plants are 5′ tall now and they have littel pods like a male but thet have lots of wite hairs too, can they have both? first time growing. need help in california!!!!!!!!!!!!!!!

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  49. its been almost 4 months i just noticed the white hairs i use to keep it outside but its been real hot outside so i keep it inside and sun gets it that way through the window, good or bad. a plant is a male or a female it cant be both on the plant can it. it has a hydro smell found it growing in a planter 6 inches tall now around 5 feet tall, really dont no what im doing

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  50. i have 3 plants growing outdoors. my wife is worried about detection. they are about 2 1/2 ft now. i have a shed i can grow then in but it gets hot in there during the day. can they live in 95-105 heat? thank you

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  51. I am doing purple outside suppose to be ready in november but i started them bout a month in a half ago when is the best time to top them and how long before i can tell the sex of them? Can somebody please give me some advice

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  52. My plants are 8 weeks old and are outside in my vegetable garden. I plan on bringing them in the house in the next few weeks. I am getting too paranoid. I have topped them twice in an attempt to keep them from growing too tall. But they are about 4ft tall now and starting to bush out. When will I be able to tell the sex of the plants? Also, what is the best time of day to transplant to the house?

    Admin says: Please see this section http://howtogrowmarijuana.com/marijuana-sexing

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    • Lst. Pinch and bend makes low plants. Its super cropping. Stunts growth a bit but you get more bid sites

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  53. My plants are 6 to 7 wks. Just added miracle gro liquafeed and just plucked one male. How many times a week should I water???

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  54. how old do my plants have to be to tell the sex? And do u have any tips for me for outdoors growing and when is the best time to top the plant

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  55. so i got these plants from some guy and their sprouted ones about 4″ the others about 2″ and im not sure how to find out what they are or what sex they are can anyone help me out im completly new at this

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  56. this is my first batch im growing outside its only about 4inches out the ground i need this to produce a good crop where do i go from here

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  57. now i know .. but my plant is not long or short its kinda stuby ant long at the same time . bow do i know im not waystin my time on a meal plant .

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  58. at which point do i sex? I am approx at 4 weeks, some are 3 inches, some are 8 inches. Ive seen no evidence of “balls” or “pistals”. Please advise

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  59. Last season was ok with these methods”
    This season I have gone step by step and I’m amazed,,
    Realy third season growing and ” I can say second month
    And they are five footers pretty nice ….. Great info : haffa@702

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  60. One other question: U don’t get too specific about watering if u have them in pots outside. What is the average # of times per 7 day week?
    Caj

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  61. Wow, my plants are looking so good with your advise. I did top mine because of height restictions and now they are about 25″ tall and full of branches, they are just 6 weeks old and they also smell like good sensimillian.
    Thanks for the info
    Caju

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  62. at what time can you sex your plants ? 6 weeks ? 30 weeks ? ??? reply plz

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  63. Man you are awsome, i have just started growing my babies and they are 6″ tall now, I have 8 pots 1 gallone for each baby on the roof top, I live in India and I have 12hrs of great sunlight and I am hoping to hunt a big bounty.. :) Thanks for all this valuble info..

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