Plant immune booster for indoor and outdoor plants high tide contains our all natural shellfish extract. High tide enhances your plants’ growth when used as an adjuvant. High tide meets USDA national organic standards sec. 205.601.High tide’s active ingredient is chitin/chitosan, which is what the exoskeletons of insects are made of. Introducing this to your plants triggers your plants immune response, which increases the size and resin/sap/essential oil production of your plants while also increasing their resilience to pests.