How to choose soil for growing cannabis
These will initially be supplied by your compost mix. Avoid peat and choose a multipurpose loam or organic-based compost. Mix it 50/50 with perlite. Your compost will have enough nutrients within it to sustain plant growth for several weeks depending on the pot size used, after which time you will need to feed the plants. Plant fertilizers have what is known as an N-P-K rating, which refers to the percentages of (N) nitrogen, (P) phosphorus, and (K) potassium that the mix contains. During the vegetative stage, cannabis uses more nitrogen, whilst during the flowering stage more phosphorous is required. Any compost mix or plant food recommended for tomatoes is fine to use for your crop, but specialist organic “Grow” and “Bloom” fertilizers specifically designed for cannabis are recommended and available online. Do not overfeed your plants–little and often is best– and follow the manufacturer’s recommendations. As soil quality can vary enormously, outdoor plants are better cultivated in large pots containing a compost and Perlite mix.
pH level for better cannabis growth
Cannabis does not like acidic soil, so the compost mix pH should be between 6.0 and 7.0. You can purchase a simple test probe at your garden store. Compost mixes are very forgiving as they naturally buffer pH themselves. Home remedies to raise or lower pH ar
pH up: Baking soda. Water plants with ½ teaspoon/gallon.
pH down: Lemon juice. Water plants with 1 to 2 teaspoons/gallon.