Beneficial bacteria are microorganisms that, when introduced to the root zone or growing medium, actively improve plant health, nutrient availability, and disease resistance. The most well-studied genera in hydroponics include Bacillus subtilis (suppresses Pythium and other root pathogens), Trichoderma (a beneficial fungus that colonises roots and outcompetes harmful fungi), and Mycorrhizal fungi (form symbiotic networks that dramatically extend the root's nutrient-absorbing surface area).
Key Facts
- Bacillus subtilis: produces antifungal compounds that suppress Pythium root rot
- Trichoderma: colonises root surfaces and outcompetes harmful pathogens for space and nutrients
- Mycorrhizae: form symbiotic networks extending effective root surface area up to 1000Γ
- Beneficial microbes are incompatible with hydrogen peroxide, bleach, and strong oxidising treatments
- Most effective in media-based systems (coco, rockwool, perlite) β harder to maintain in DWC
- Products: Great White, Tarantula, Hydroguard (Bacillus amyloliquefaciens) β apply at transplant