Hydroponic Marijuana Grow Guide

How to Grow Hydroponic Marijuana or Weed

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What is Marijuana Hydroponics and How to Grow Weed with Hydroponics?

Growing marijuana hydroponically simply means that you grow the plants in an inert, sterile growing medium instead of in soil. All of the plants’ nutrient requirements are supplied when you mix water with the nutrient solution. Plants are 80% to 95% water; the remaining parts are carbon, oxygen and hydrogen. Plants extract these elements from the air and water so nutrients are actually a very small amount of the total weight of a plant. It is the plants entire atmosphere that needs to be controlled within the hydroponic environment to produce perfect crops.

Indoor marijuana
Marijuana plants, and in fact all plants, do not need to be in a living soil, they require nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S). Those are the macroelements (the big ones) and the small elements known as microelements are iron (Fe), chlorine (Cl), manganese (Mn), boron (B), zinc (Zn), copper (Cu) and molybdenum (Mo). Hydroponics introduces the water, nutrients and air to the roots through the growing mediums and since using hydroponics bypasses the web of roots and the energy required for the plant to acquire the nutrients you get faster growing plants.

Hydroponic marijuana set ups

All growing described on this page is done using the Ebb and Flow system. The Ebb and Flow system is one of, if not the most popular hydroponic methods for growing weed. It is simple and easy to use. It works like this: A reservoir containing nutrient solution is located below a growing tray. The tray contains the plants that are in containers with growing medium like Rockwool. The growing bed is filled with nutrient solution by a small pump on a timer to feed and water the plants. The timer then shuts the pump off and the nutrient solution drains freely back into the reservoir. Ebb and Flow systems’ are favored because of their low maintenance, high productivity, and ease of use. Ideal not only for the beginner, but for the advanced gardener as well. Sea of Green (SOG) and Screen of Green SCOG – growing systems are used more by commercial operations where speed and yields are paramount but can be used in smaller home grows. The equipment is different and you need cannabis strains that are capable of flowering after a short vegetation period, read more. If you would rather buy a ready built grow room rather than grab all the gear from the hardware store (they will know what you are making), it may cost a little more but all parts will be included and you will save time by getting everything at once. It’s possible to get an 8 plant unit setup for around $300, ebay has a lot of inexpensive gear. More about hydroponic grow systems.

Marijuana lighting

Since modern hydroponics began people have used high intensity discharge (HID) lights like metal halide (MH) or high pressure sodium (HPS) to grow marijuana. Metal halide light is close to regular room light or cool fluorescent light and is more abundant in the blue and green spectrum’s which is best for vegetative growth. While high pressure sodium is in the orange, amber and red end of the spectrum which is best for flowering stage (later) growth. Growers often use these two lights in tandem, MH for vegging and HPS for flowering or both at the same time. Marijuana grows well from 420 through 730 nanometres which can be covered in this method. HID lamps like the MH and HPS offer a lot of light but just as much wasted energy is emitted as heat. You will need to manage that heat with a good ventilation system. HIDs also require a ballast to operate so make sure you buy one of them. Expect to pay about $250 for a 250W HPS/MH digital ballast, bulb and reflector combo. Broad spectrum LED grow lights are the new breed and offer a number of advantages over HIDs. Broad spectrum LEDs cover the 420 to 730 nanometres growing range and run on 82% less electricity. A 1000W HPS is the equivalent to approximately 185W LED. Good LEDs run cool and emit very little heat; the LEDs last for an amazing 50,000 to 60,000 hours and don’t require a ballast. LED grow lights are a great solution to the old HIDs. Much more on grow lighting.

Marijuana growing seeds or clones

If you know someone who grows, ask them for a few clones. If you don’t have access to clones you will have to buy marijuana seeds. If you don’t already have some, you can ask you friends to save you seeds out of any good weed they may come across. If you need seeds we totally recommend reading this cannabis seeds guide.

Germinate the marijuana seeds

Set up your hydroponic garden before you germinate the seeds. Make sure everything works fine. If you are using clones, skip this section. There are various types of media available to grow in. Rockwool is one, but there are many others. Media simply means the substance that the roots grow in. Since you aren’t using soil in a hydroponic garden, you need a substitute. The media will provide no nutrition; it is just a support for the roots. All nutrition comes from the hydroponic solution. The standard thing to do is use a Rockwool cube to start the seed on and surround it with whatever growing media you use. Keep the Rockwool cube so that the bottom 70% or so is submerged when the water is at its maximum, but keep the top part above the water so that the seed is never submerged. After the seeds have germinated and the root is about a quarter of an inch long, place the seed, root down, on your grow cube or media in your hydroponic cups.

Vegetative marijuana growth

The first phase of marijuana growth is called the vegetative phase. If you plan on using LED, MH or HPS right away, Start with about 20 inches or more above the top of the plant (less for LEDs) and lower the light an inch or so daily until you think the height is right. Too close and the plants will dry and turn brown. Too far and the plants grow too tall as they stretch to get closer to their light source. That is a waste of space. Start high and lower the light an inch or two daily until you think the height is right and the light emitted is being caught well by the plants. During the first stage of growth, the vegetative stage, keep the light on 18 to 24 hours a day minimum. The longer it is on, the faster the plants will grow, but the higher your electricity bill will be. More on marijuana vegetative growth. More on marijuana vegetative growth.

Marijuana flowering

Flowering is the phase of marijuana growth that produces the most THC, CBN and CBD; these are the active ingredients that produce a high when the female buds are smoked. Once flowering begins, the height of the plants will taper off as the plant energy is used in the flowering process itself. You can start flowering when the plants are a minimum of about 6 inches high and have at least 4 sets of leaves. This will take 2 weeks to a month of vegetative growth in most hydroponic gardens. When you want to start flowering, cut the light back to 12 hours a day. If you start the flowering when the plant is very small say 6 inches the height of the plant will continue to increase for about two to four weeks after flowering has been started, after that all the plants energy will be used for flower production. If you start the flowering when the plant is a bit more mature it will start in around 10 days. Limiting the height of a marijuana plant has always been a difficult task, so one easy method is to raise the height of the light as the plant grows. There are methods of limiting the height of a plant, but none of them are really easy. We recommend one of the Marijuana Growers Guide which has the most comprehensive descriptions I have seen on limiting the height of weed. The flowering cycle lasts about two months, sometimes a little longer, depending on the type of seed. So the total length of time to raise a crop should be 3 to 4 months in a hydroponic garden but much less if you use the Sea of Green or Screen of Green methods. During flowering the dark period must be perfectly dark. No room light, sun light, or any other light should reach the plant in the 12 hours of darkness that the plant must get everyday. The strongest light that should reach the plant during flowering would equal that of moonlight. Stronger light than this will delay flowering, and if it continues there is a chance that the plant will not flower, but stay in the vegetative phase. You will know the plants are flowering when you see what look like little white hairs developing at bud sites. They should be visible after about 10 to 14 days of the flowering light cycle. This is when you need to remove the male plants, not required if you have female clones. These pistils will eventually be the red or white hairs that you see turn into nice big buds. More about marijuana flowering and sexing.

Start of How to grow marijuana indoors with grow room planning >>>

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To enjoy the ultimate is seeds from we always use Sensi and recommend talking with the grow gurus as Fullbloom hydroponics – they will sort you out a monster grow tent kit

Industry Friends

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66 responses to “Hydroponic Marijuana Grow Guide

  1. Ok stupid questions but I am new to this. What seeds do will specifically work with the hydroponics grow cabinets? I am going to buy 2 of them so if the bottom holds 60 babies should I buy 60 seeds or just clone 1 seed? Please leave a few comments with a few pointer as if I had seeds and 2 grow boxes right in front of me now. Just the basics help me out here.

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  2. It has been a month I put a seed with root in my cube in my hydroponics set up now it grew say 5 inchs and only has two of the vegge leaves.Now is there something wrong

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  3. do you need air stones in a deep water hydro unit, if the water if flowing and falling into the bucket.

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  4. i need to know why my clones,they are in dirt now.but they are babbies and showing their gender already?will they still grow and produce?i might have waited too long to do my cloning?is the mother plant of this any good?

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  5. i have my seedlings under fluresent strip lites proper grow lites but i dnt really know how close 2 put them as this is my first grow any advise wud b gr8

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  6. More useful crops? Thank you, you made me laugh.

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  7. YOU CAN NOT TURN A MALE INTO A FEMALE. What you can do, is make a female produce seeds like a male. However, that plant will no longer be able to be able to be used for smoking. But the seeds formed this way will be certain to produce a female plant genetically identical to the “mother plant.” The new plants you can smoke like other buds.

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  8. I know that you can grow anything with hydroponics. But why marijuana if you can grow other more useful crops? I’m really astonished to see that a lot of people are actually interested in doing this (or are already into it) marijuana hydroponics. But I guess only a few countries are allowed to grow and use marijuana.

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  9. Marijuana plants, and in fact all plants, do not need to be in a living soil, they require nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S). Those are the macroelements (the big ones) and the small elements known as microelements are iron (Fe), chlorine (Cl), manganese (Mn), boron (B), zinc (Zn), copper (Cu) and molybdenum (Mo).

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  10. how big should the storage tank be,have 6-5gal pals with top drip my ec/ph are hard to keep stable. 2nd day after water change it starts to change,add ro water every day.have 10gal storage tank is this to small

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    • sorry can,t help u

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  11. i purchased clones and they are 2 weeks old now i have them under a 600 watt light how high should it be away from them?. i would also appreciate some help on how long i should have the feeding pump on for at the minute i have them feeding for 1 hour then the pump is off for 3 hours and then back on for an hour and so on throughout the 18 hours that the light is on is that enough? any help on this matter would be helpful as this is my 1st time growing hydroponically.

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  12. this is an brilliant tutorial on indoor gowing with hydroponics. will definately subscribe to your feed once our blog is up and running for hydroville.co.uk.

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  13. The best way is to cut off a clone from the mother. And dip it in some root solution after that let the plant recover from the shock. Then feed it medium solution on the nutrients after recovered from the shock. Now u can put it in the flowering invoronment. Once 2 to 3 weeks go by u will start seiing either little cristals or hairs on the stubs of the plants and the leaff that will be ur female. Ur males are useless unless u want seeds. A male will have little pods on the stubs of ur plant. .

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  14. Hydroponics was derived from the Greek word hydro, which means “water” and ponos, which means “labor or water-working”. Hydroponics gardening involves growing plants with their roots in other nutrient solutions and without soil.

    Hydroponics gardening is as simple as ordinary gardening. Both of them necessitate sufficient light, water, temperature, light, and humidity. But with hydroponics, no soil is used. Instead a soil substitute holds the roots while nutrients are carried by the water. Indoor hydroponic gardening is not that hard and plants respond well to this method of growing.

    This is one of the major considerations in hydroponics gardening since it sustains the plants. One has to make sure that this nutrient solution maintains a pH level of 5 to 6 after dilution. In hydroponics gardening, the plants should be watered more than three times a day. this is usually done using a pump and timer.

    If your hydroponics garden is located indoors, the most suitable temperature is between 71 to 76 degrees Fahrenheit. Of course, this temperature may change depending on the different types of plant you are working on, e.g. tropical plants.

    Place your plants somewhere they can receive ample amount of light. Otherwise artificial light must be used. High pressure Sodium lights or bulbs are a suitable substitute for natural light.

    Humidity is good. When the room’s temperature rises, the air will be able to hold the sufficient amount of moisture your plants will need.

    A hydroponics system can be fully automated. Since it is water-based, the gardener has no soil to dig or weeds to pull. Also, the water can be re-used to prevent wastage.

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  15. Im growing swag ive grew before but i dont really know to much about growing, and im growing outside Help!

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  16. hey little guy, you save an love that plant, it came to you, happy days man. i wish i could see it.

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  17. don’t give up. it’s not as easy or AS FAST as you may have heard. but very rewarding. go to, how to grow marijuana.com all the tips, an advice you need. just to watch them grow!!

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  18. How many times a day do you water your marijuana plant when growing hydro? what is a good watering schedual?

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  19. G you prob are watering too frequent if you have flood system if its a drip system then its a low or lack of a micro nutrient. Yellow tips on new growth means too much nitrogen. Yellow tips on old growth is common but keep an eye on those nutrient levels! Your plants will tell you what’s up! Solid yellow leaves at base of plants could realate to high ph too. check all levels

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  20. bottoms of the plants are going yellow, including the buds. can you help give me the reasons for this.

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    • i have a problem with my plants the leaves underneath are going yellow the ph is ok and the food levels are ok .can you tell me what els to look for please.

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  21. Mr Old Man would u mind emailing me ? I have a science question

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  22. how do i set up a system to grow hydroponicaly. im new at growing hydroponicaly

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  23. you can tell the sex of your seeds. Female seeds have a volcano like crater on one end. If the crater is a perfect circle then you have yourself a female seed, if its oval, or wavy, or not a perfect circle, then its a male.

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  24. Hydroponic, working with some feminized, auto-flowering lowryder variant. Any benefit to trimming lower leaves, or have genetics predetermined height of these plants?

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  25. Hon’ble Sir, kindly inform easiest way to grow vegetable crops under

    HYDROPONICS and which crops can be grown easily and successfully. THANKS

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  26. is thier anyone in boston area that i can consult with that has a sucsessful grow. i have had several failed attempts with a1 seeds.

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  27. Never had a prob using water straight from the tap, spose to to age it, boil it, but doesnt make too much a diff.. if you found a plant in the street with buds on, smoke up, theres nothin to save..

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  28. @DeAndre – the only way to increase the speed is to induct CO2.

    As far as water goes get some distilled water from the grocery store and add your nutes to that.
    And for everyone on here asking how do i grow pot? for real go to a legit grow site, some were mentioned my personal favorite is rollitup.org, the growers on here have done it for years upon years, also if you are having problems i have posted pics to rollitup and gotten replies to what my plant problems are in less then two minutes after posting.

    Find a site like that for all your NEW-B questions and buy a book or two. Dont get me wrong i remember the first time i started growing, but growing isnt just a quick get in get out, you have to take time. Your Plant= Your Baby. Respect them and they will respect you.

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  29. I knew to this and I am growing in a wardrobe with a 600 watt lamp any advice for which soil to use?

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  30. You can use de-chlorinated water, or you could just add H2O2 instead of aging the water. Much quicker, and more sterile that way.

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  31. I need to know how u can i grow weed and if i can make weed grow faster please i need to know?

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  32. Been growin for 43 years-Refer to the guidelines in this web site- they are most accurate-The rest is a matter of trial and error on your own part.

    Purified water/ Lights Mh first (Vegatative) HPS second (Bloom) Good air circulation and constant temperature-DONT be stupid and/ take pictures /tell anyone you are doing it/brag when you have had a drink/think that no-one will recognize that smell (Use air filters) Other than that HAPPY GROWING!!!

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  33. reading all this is kinda helpfull my self being a 16 yr old female yeah im hella interested in learning how to grow this lovely plant hmmm…i needa study on this shizz more

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  34. Just curious, but what is the reason for using aged water? I assume it’s to do with chlorine/chloramines in tap water but I’d like to know for sure.
    The reason I ask is, say life gets ahead of you and you forget to put water out to age, and the reason for aging is indeed to allow time for chlorine etc to evaporate, could you use a dechlorinator intended for use in aquariums?

    I run a planted aquarium and I age water for it too, but find the dechlorinators do work very nicely when I forget. I’m down with plant care, fertilisers, substrates etc. I don’t grow pot, but I’m researching. There was that fateful summer when I was away and my mother discovered a rogue plant in the garden(roaches flicked into flowerbeds make good germination pods? LOL), subsequently killing it when she attempted to care for it(she knew was it was, she thought it was pretty, bless her).

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  35. grow marijuana, sunshine is most important,i think you can try to use led grow light

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  36. Actually these people are wrong you can determine sex as early as a month old, look up what pistils are males have one pistole one each side females have multiple there little nodes that grow up against the stock by where new branches come out and such

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  37. I did a stupid thing. I was walking down the street here in Northern China and I spotted a plant growing out of the crack between a sidewalk and a concrete wall. I took a picture of it and then asked the people who owned the shop if I could have it. They didn’t know what it was so they said “yes”. I was in such a rush to get it out and get it home that I just pulled it up (stupid me!)… not really thinking about what I was going to do with it. I got only one half of a good root and a few small web-like roots. First thing when I got home, I put it in a vase where I have some hydroponic bamboo growing. But this should only be temporary. It’s about 26″ tall, with about 75 leaves and a stalk about 3/16″ diameter. It’s even got buds! It’s amazing that it lasted this long because the temperatures are almost down to “freezing” in the daytime. I walked down the streets of this major city, crowded with people, and even walked by the very front of police station, and “nobody” gave me anything more than a curious look, which is quite natural when they see an American. I’m a Viet Nam vet, so I couldn’t believe what I saw when I found it. What should I do? Did I kill it already, or can it be saved…poor little guy :(

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  38. if im using the ebb and flow monster (55gallon) reservoir and the 12 5 gallon buckets,,How much do i fill the reservoir and how much median goes in the 5 gallon buckets or does it just go in the netted bucket inside the 5 gallon,,im very confused still i need help,,please respond @ my email adress cjacksina@yahoo.com

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  39. What type of nutrients should I look to buy if I am growing in a water culture system?

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  40. What shall the temperature around my plants be ?

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  41. at this point your roots are going to determine your growth rate. Make sure no light is getting to the roots and that no damage has occured. I like to use floresence lighting so plant can be clocer to light without burning.

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  42. broke off single head from plant in bloom. What can i do to try and save it

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  43. btw i do have 2 air stones so plenty of air…using led lights …what do i have to do !!! and how do u kill spider mites i’m using that soap spray now but its not working

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  44. i’m a rookie grower as well and my plants r dying i got root rot due to me just sitting my plants in the resavor with nutriants…anyone know what i can do besides proxcide to fix…i also cut roots but still persistant and i flushed and cleaned resavor sereveral times already…plz i don’t wanna waste the money i spent on my clones cuz i’m a broke white boy…open to any suggestions..anything to improve my babies status..plz help

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  45. Lol I swear, I’m 16 and I know more about growing pot then most of you lol, do your homework. I’m not tryin to sound like a dick. I just have seen a lot of ppl put lots of money in and fail and loose a lot of money. Go to like hempfest and hempstock and learn from pros lol that’s what I did.

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  46. Okay all you ppl who just one day wake up, ima grow ganja and do hydroponics. Do your fucking research first. I have taken many horticulture classes and have spent hours reading. Do your homework before you think you can grow. Also stealth is a big thing.

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  47. my plants are kinda wilty whs up can someboby help?

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  48. Okay I”m completely new to the growing. All I know is I have a lamp in my basement, and I’m probably gonna be getting some NY Diesel seeds. Someone wanna give me a tutorial so I can have a good first plant? Basically I need to know how to plant, how and when to water/give light, and how to progress from stage to stage. HELP PLEASE! Thanks.

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  49. I have like silk worms or small caterpillars in my buds what’s up with that? They are very small

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  50. I just set up my Aeroponics system, and my white widoe plant is only a half inch tall and it hasn’t grown in 4 weeks, the person that sold me the set up told me to use these dirt like shape hockey Pucks. the light I’m using is MH 600 wt. what am i doing wrong

    thank steve

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  51. i know why you clone from mother plant before flowering starts,but clones root in 10 days, mother only two weeks into flowering, flowering takes 8 to 10 weeks. clones will be to big for cloneing area ? im not getting how continuous rotation from ready to flower mom, cut clones , bye time mom is finished, clones will be moms there self. or is that the whole idea ! no because then you would clon twice . could someone help set me strait on rotation cycle and how it work , new at this ha ha! PLEASE HELP !!!!

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  52. I was told that you need a male plant to make a female plant bud is that true cause all mine are female?

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  53. hello all im a newb to growing hydroponic pot and i have built my own system but now i dont know where to go from there… what i need to know is what type of fertlizers(micro nuitrents)do i need? i live buy a store in gainsevillie fl, called gardners edege. heres the link – they have so many ferts/nutrients i dontknow what i need to run a basic 5 plant system. my system is a dip basket with pea pebbles/stones and insted of rock cube i used cotton balls. with a basic fishtank air pump. im going to that store as soon as i can figure out what things i nned to get for ferts.
    so if anyone could please help me i would greatly appreciate it. i left the link so anyone who wants to help me can go on that website and see all the fert’s they have. if someone could just find what i would need on there and tell me that would help me so mch, and after that im going to buy the stuff. thanks – nick

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  54. The best way to tell if a young plant is female is after the first couple pairs of food leaves, the leaves start to alternate. They no longer grow out in pairs, but single leaves shoot out from the main stalk, rotating around it.

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  55. Ok so I’m grow some pot using hydroponic system Nd i started two days ago…the only thing is i don’t know if i started it right..i just put it in on of those rapied rooter and put it in the hydroponic system will it work that way..i kinda hope so cuz what a wast if not..lol of “money”

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  56. How much water do i give her ? Shes about a foot long. Do i give her water every day? Its my first plant !!!

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  57. How long does it take to grow and to be able to smoke it

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  58. Ppl like you get all the brains. I just get to say tahkns for he answer.

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  59. The easiest way to determine the gender of an cannabis plant is to examine its flowers. To initiate flowering, most strains require 12 hours of day (=light) and 12 of night(=uninterrupted darkness). Female or Pistillate flowers are easily distinguished from the males by the long white ‘pistils’ protruding from the calyxii (bottom far right on the last picture). Male or Staminate inflorescences are like tiny bells hanging on the limbs of the flowers
    weed prices

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  60. There really isn’t a best way, just a female buds and males don’t, but if you know what you’re doing you can turn a male into a female.

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  61. WHAT IS THE BEST WAY TO DISTINGUISH SEX IN CANIBUS?

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  62. Pingback: Original Kush Weed Seed Strain For Sale and Reviewed. Marijuana seeds strain lists.

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