: Bt is a biological product and can expire; many home gardeners find that a small bottle lasts a year or more.
: Walmart features various Bt formulations including concentrates and ready-to-use sprays from several different brands. Key Considerations for Your Purchase
: Concentrates are more cost-effective for larger gardens but require mixing with water in a sprayer (typically 2–4 teaspoons per gallon). Ready-to-use (RTU) bottles are convenient for small, targeted treatments.
: Home Depot and Lowe’s carry major brands like Monterey and Bonide.
Do you have a you're trying to get rid of, or a certain type of plant you need to protect?