Lava Rock in Cannabis Containers: Pros, Cons and Use
Lava rock adds weight, air and drainage to cannabis containers. See how to screen, rinse and blend it into a mix and why a bottom layer fails.
Rice Hulls for Cannabis Soil: A Perlite Alternative
Parboiled rice hulls add drainage and air space to cannabis potting mixes. Learn how they compare with perlite and what share of the mix to use.
Pumice for Cannabis Soil Mixes: Aeration and Drainage
Pumice is a porous volcanic rock that adds air and drainage to cannabis potting mixes. See how it compares with perlite and what share to blend in.
Sulfate of Potash for Cannabis: A Low Salt Potassium Source
Sulfate of potash supplies potassium with less salt than muriate of potash. Learn its analysis, when cannabis needs it and how much to apply.
Langbeinite for Cannabis: Potassium and Magnesium in One
Langbeinite is a mined mineral that supplies potassium, magnesium and sulfate without shifting pH. See its analysis and how to use it on cannabis.
Humic and Fulvic Acids for Cannabis: What Research Shows
Humic and fulvic acids are sold as cannabis growth boosters. Learn what they are, what a Utah State study found and when they might be worth it.
Crab Meal for Cannabis: Nitrogen, Calcium and Lime
Crab meal is ground crab shell that adds nitrogen, phosphate and lime. See its typical analysis, how fast it works and how to use it in cannabis soil.
Oyster Shell Flour for Cannabis: Calcium and Soil pH
Oyster shell flour adds calcium and slowly raises soil pH. Learn how fine it must be, when cannabis beds need it and how much to mix into the soil.
Insect Frass for Cannabis: What Growers Should Know
Insect frass is the residue left from raising black soldier flies. See how it works as a cannabis soil amendment, what it adds and where it falls short.