To sanitize is to reduce microbes on tools, jars, trays, or other equipment to a level considered safe for food-safe use. In home gardening for sprouts and microgreens, sanitizing is a routine step before each growing cycle because the warm, moist conditions that support germination also support bacterial growth.
Common sanitizing methods for home growing equipment include: soaking in a dilute bleach solution (one tablespoon per gallon of water, followed by thorough rinsing), washing with hot soapy water and air-drying, or using food-grade hydrogen peroxide. The choice depends on the material — glass and stainless steel tolerate bleach solutions well; some plastics degrade with repeated bleach exposure. Seeds themselves can be sanitized before soaking by brief immersion in a dilute hydrogen peroxide or vinegar solution, which reduces surface-borne pathogens without damaging the seed’s ability to germinate.
Sanitizing is distinct from sterilizing. Sterilization eliminates all microbial life; sanitizing reduces it to safe levels. Home growing does not require sterile conditions — the goal is to prevent pathogenic bacteria (particularly Salmonella and E. coli) from reaching populations large enough to cause illness. Regular sanitizing of equipment between batches, combined with consistent rinse cycles during growth, keeps microbial loads manageable without the specialized equipment that sterilization requires.