Continue to use leek roots - let the leek regrow
Leek Roots - Free Harvest - Grow Leeks:
If there are just a few empty flowerpots left and you are in the kitchen cleaning vegetables (leeks, the hairy end), it is worth trying to plant these remnants of leek roots.
First, put only a small amount of soil in the pot and insert the roots so that the top piece still looks good. When the plant has gained a few inches, continue to pile up soil. Possibly. pour with some liquid vegetable fertilizer. Continue until the flower pot is filled with soil. In better weather, of course, in the fresh air - balcony box or terrace.
After about 3-4 weeks, enough has grown, so you have a free harvest of tenderly grown leeks.