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Marijuana pH and water

All plants need a plentiful supply of good clean water to grow. Tap water works ok but can often be high in alkalinity; if you are going to use tap water without a filter system then it is recommended that you leave tap water to stand for a couple of days to allow it to dechlorinate. You should also test its PH and make changes as necessary. Some growers prefer to use rain water, however, rainwater contains many pollutants and can vary wildly in its PH values and is therefore not recommended. It is possible to use tap water by providing optional calcium and magnesium components to the feed program, just check what amounts you have so far.

Supplying water to your plants is at the heart of your grow room. There are a whole range of automated watering systems to choose from.

If you are growing in soil and watering by hand your plants will need good drainage to enable flushing and avoid a build up of salts from the nutrients, they should not be left in standing water.

The exact frequency for watering your plant will vary according to size, strain, growth rate, temperature, size of pot and other variables. You should avoid saturating the plants while at the same time preventing them drying out. Put your finger an inch or two (2.5cm – 5cm) into the top of the soil. If this is dry then the plants need to be watered. With young plants this will be every few days. As the plants get bigger you will need to water more often with larger amounts. A large plant may require daily watering.

Observe the plants. Plants requiring water will begin to wilt and the leaves will droop. If you water when this happens your plants will revive within the hour. With practice, once you become familiar with your plant, you can catch it before wilting happens. Give enough water, directly onto the soil, so that it just begins to come out of the drainage holes at the base of the pot.

Water is used most efficiently if you give it during the plant’s morning photo period (remember its cycle may be different than the actual daylight cycle). A spray of the leaves during its evening is also beneficial. Remember to use water at room temperature to avoid shocking the plant.

pH for Marijuana

pH is the measure of acidity of any given substance. A pH of 7.0 is totally neutral, 1.0 to 6.9 is acidic and 7.1 to 14.0 is alkaline. An increase in pH from 7 to 8 is actually a tenfold increase, so be aware! The average pH of American tap water is around 8.0 Marijuana responds best to a pH level of between 5.5 and 6.5 when it is grown hydroponically. There are products available known as pH Up and pH Down. These will help you to regulate the pH of water and nutrient solutions. If you are constrained by budget you can use baking powder to raise pH or vinegar to lower it but this is not advised. You need to note that it is natural for the pH level of a reservoir to climb over time as the plant takes up more water than nutrients. This will usually take between 5 and 10 days to move the pH up from 5.5 to 6.5.

Most growers use a continuous pH monitoring device, there are lots on the market but you should never totally rely on this one system. You should use a backup system to spot check and calibrate the original… if both are reading the same pH then all is good but if both are different you really need a third device to see which one is actually right!

Reverse Osmosis

These machines actually block molecule sized substances that can measure as low as 0.0005 microns. The systems have membranes with trillions of little holes and the water is pushed through them with two outputs, one of brine or waste water and the other of pure water. You want a nice even flow of water through the reverse osmosis machine at a rate of around 60 pounds per square inch; if you find the pressure in your flow gets too low then you need a back up pump to stabilize it. Reverse osmosis machines do waste a lot of water though at around 10 parts per 1 or 2 parts of pure water produced. These are complicated machines and we would advise that you look at systems that include both a booster and a permeate pump. We have a full run down on reverse osmosis machines read more.

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From the forum

How to Grow Marijuana Forum - Growing Marijuana Indoors & Hydroponics

22 thoughts on “Marijuana pH and water

    • Impossible to tell without pics etc, but the most common cause of yellowing leaves is nitrogen deficiency. Although be careful that it is not just the natural loss of the lower fan leaves which is a normal part of marijuana cultivation. Also, if they are approaching the end of the flowering cycle, yellowing leaves due to lack of nitrogen is totally normal.
      Try joining the forum where you will be able to post pictures so people can have a proper look at your problem.

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  1. For Spider Mites – Use a spray bottle with a weak dish soap solution. Spray the leaves (usually the underside), wait a while then rinse off. And this came from an insect biologist type.

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  2. Im a first time grower. And need advice my plant looks healthy and is almost 20 inches tall but i just added some miracle grow and two of my bug leaves are purple or brown on the edges. What am i doing wrong what can i do to keeo it healthy outdoors???

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  3. iam growing outside and it looks really good right now it exactly one month and the smell is starting to rise the corners off the branchs are growing leaves as welli had watered it early in the day and then it started to rain and i covered them and now they started to filt are they messed up what should i do.

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  4. (HBK) TREELOC

    ME and THE Friend are growing inside and outdoor but my question is about my outdoor some of my leaves are turning green with white but they look a little pail what does this mean?

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  5. Damn man…i juss got done planting outdoors and i need to know how often i need to water and how much to give?

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  6. ive been searching the net for a while now an im tired of it!can someone tell me how much to feed my baybies an what are the best organic feeding solutions.thanks a lot dudes

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  7. I’m helping my friend grow, and we are growing outside, he doesn’t want to bring water for the plant so he wants to use water that is close by. But to me the water looks stagnant is it going to hurt the plant, I have a feeling that it will

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  8. im just starting out and have just bought (according to shop) everything i need, i have grown in soil before but never hydro, the shop sold me an ECmeter, can anyone share some wisdom with me about this?

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  9. i use a product called liquid ladybug its awsome kils on contact and leaves no residue use even on last day of harvest google liquid ladybug
    and good luck

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  10. I just germinated a bunch of seeds and ive pod planted all of them I have some good sprouts what should I use for a good grow boost and does anyone know where to find worm castings in San Antonio?

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  11. The best way to get rid of spider mites is to buy neem oil. It will be sprayed on your leaves. The spider mites will eat the neem oil and die. No harm to your plants and it is organic. Also spray your leaves every 3 days with ice water. This will keep them away and will not hurt your plants at all.

    Pug Weed Colorado

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  12. i got a outdoor girl and its startin to bud do i want to start giving it some 20-20-20 fertilizer in ts water.

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  13. I have a female for sure and she’s huge,almost 5′. The tops are still producing veg. growth as far as I can tell. The newest leaves are curling up, the rest of the plant is bright green and healthy. Any clues?

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  14. In response to bill. You can use any shop vac or vacuum cleaner with a long nozzle tip. It’ll suck the spider mites and their web without hurting your buds.

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  15. your plant needs to mature more for the buds to increase in density. when the buds are fluffy the plant is not yet actually done some ppl will crop out with fluffy buds just so they can start a new crop and get rid of that one but the bud quality will be much better quality and higher in potentcy and yield if you just let it propreley finish

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  16. I hav a bud plant that was almost done but was stil 2 fluffy an i cut aout 3/4 of it off an cliped the tips.it is now getting very big with only levs how long will it tak 2get the buds or wat is hapining is it ruined

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