Proper pH for cloning

I have a large garden and do a lot of cloning. For the most part I use expanding peat pots. Sometimes I use coconut fiber plugs, but I don’t get as much success with the coconut as the peat. What pH is proper for cloning? I have heard a lot of different suggestions.

The coir plugs are produced from coconut husks and are considered a renewable resource. They have a neutral pH and don’t seem to affect the pH of the water. Peat plugs are produced by stripping layers or mining bogs. In the last decade ecological questions have arisen about this practice. Peat has a low, or acidic, pH. Obviously, the pH should be adjusted for the different conditions. Coir has some of the same qualities of Oasis, a foamed plastic used as starter cubes. Clones do best in both coir and the plastic cubes at a pH of 6.3.

Peat cubes lower the pH of the water so the pH should be raised to 6.4 or even 6.5. To find out exactly what pH to use, check the peat’s pH. Figure out how much lower than 6.3 the peat measures. Then raise the water’s pH by that amount. Finally, after watering, check the pH of the drain water. It should be about 6.3. If it’s off, tinker around with the irrigation water pH, until the drain water does measure 6.3

Many people use Rockwool starter cubes for cloning. They are made from spun basalt rock. There are ecological problems related to their disposal. A lot of used rockwool winds up in dumps. Rockwool has a very high pH, especially when it’s new. I found that it produced spectacularly when it was buffered in a low pH water, 5.8, for at least 12 hours before it was used. The irrigation water was adjusted to 6.1.

Readers with grow questions (or answers) should send them to Ed at: Ask Ed, PMB 147, 530 Divisadero St., San Francisco, California 94117, USA. You can also email Ed at [email protected], and send queries via his websites at All featured questions will be rewarded with a copy of Ed’s new book, Best of Ask Ed: Your Marijuana Questions Answered. Sorry, Ed cannot send personal replies to your questions.



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