Companion is an organic solution extracted from seaweed. It consists of highly concentrated bacillus bacteria. This bacteria has been shown to work as an anti-fungal inoculate. We do not believe anything kills fungus once it invades an orchid (except cutting it out) but the best cure is to never get it in the first place. Companion strengthens the orchid raising its level of defense to resist the first infection. Partnered with Essentials it aids in the branching of roots. Partnered with Vermi-liquid (natural beneficial microbes) it makes a powerful three way punch.