Q: I have accumulated a number of lawn and garden treatments like Triazicide, Immunox, Sevin, and assorted weed killers. How long do things like this remain effective?

A: Freezing and high heat cause some, but not all, pesticides to degrade. If yours haven’t experienced extreme temperatures, they are probably still useful. If you simply want to get rid of the partially-filled containers, triple-bag dry pesticides in heavy duty plastic garbage bags. Solidify liquid pesticides by pouring them into a sealable container of kitty litter. Wrap empty glass containers with several layers of newspaper before triple-bagging. Then put the items in the garbage for pickup.