Leeks are biennial plants, which means their natural life cycle is two years long. They will produce a seed stalk in their second year. Cover your stalks for seed saving over the winter if you live in a cold climate.

Do leeks seed themselves?

When many plants bolt or go to seed, like broccoli or basil, it is due to warm temperatures. With leeks, it’s different. When leeks go to seed, it is normally due to being exposed to optimal temperatures followed by cold temperatures.

Do leeks grow forever?

Leeks will continue growing without fertilizer, even in water, although they may grow more slowly and grow thinner stalks since they won’t have enough nutrients for proper growth.