Cannabis growing medium ph levels - Ask Extension
I’m growing cannabis in a peat based soilless medium. I recently limed the medium to raise the ph of the soil but raised the ph to 7.1 one whole ph ...
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Cannabis growing medium ph levels #892317
Asked February 05, 2025, 8:59 AM EST
I’m growing cannabis in a peat based soilless medium. I recently limed the medium to raise the ph of the soil but raised the ph to 7.1 one whole ph point more than I wanted. Is a ph of 7.1 too high for cannabis growing medium? I read it should be 5.8 to 6.2, how big of a sin is a ph of 7.1?
Hubbard County Minnesota
Expert Response
You may not notice a difference. If the leaves show veinal chlorosis adding acidic fertilizer will probably be enough to correct the problem. A higher pH can reduce growth but it is unlikely to stop growth. Cannabis is a weed.
https://fluence-led.com/monitoring-ph-for-cannabis/#:~:text=Cannabis%252C%2520like%2520many%2520plants%252C%2520prefers,5.8%2520%E2%80%93%25206.2%2520will%2520limit%2520growth.
https://fluence-led.com/monitoring-ph-for-cannabis/#:~:text=Cannabis%252C%2520like%2520many%2520plants%252C%2520prefers,5.8%2520%E2%80%93%25206.2%2520will%2520limit%2520growth.
