It pertains to the growing medium or nutrient solution that has a higher pH level. Keep in mind that the pH level must be between 6.0 and 7.0 only for the optimum health of your plants. If you use soil and its pH level exceeds normal, it means the soil is alkaline type. This type of soil normally consists of different kinds of materials like calcium carbonate.
“Alkaline soil is not different from the acidic kind. Fix it as soon as you can for the sake of your cannabis plants.”
“As a grower, one of the biggest things you should do is to ensure the environment and growing condition of your cannabis plants. These include making sure the soil you use is not acidic or alkaline.”