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Cannabis plants can only uptake nutrients in a set pH range. Recommended pH range for soil is 6.0-7.0 pH and soilless and hydro is 5.5-6.5 pH.
Understanding and knowing what pH your nutrients need to be is the second factor your grow medium will decide. Your plant’s roots can only absorb nutrients within a pH range. The nutrient itself will decide that range and your plant has unique ranges for each nute. This means you shoot for a general pH instead of a set one.
A neutral pH is 7.0. and if you collect rainwater and test its pH, it will come out to that or just under.
For soil growers anywhere between 6.0 - 7.0 pH when watering your plants is great. You’ll want to always pH your water and make sure it's within that range regardless if you’re feeding nutrients or not. You won’t always water with nutrients.
Soilless and hydro users will aim for a range of 5.5 - 6.5 pH.