Liquid extracts made by steeping plant material (herbs, flowers, leaves) in water, used for various gardening purposes including pest control, disease suppression, and nutrient provision.
Botanical teas (compost tea, herb teas, specialty extracts) are water-based brews of plants or compost. Some suppress diseases (compost tea contains beneficial microbes); others deter pests (neem tea, garlic tea); others provide nutrients (nettle tea, comfrey tea). They're organic, safe, but evidence for efficacy varies. Some are well-researched (compost tea); others are traditional but less proven.
Botanical teas are organic alternatives to synthetic sprays. Some are effective; others are more folklore than science. Understanding which work matters.