well I found with my lettuce earlier this year, since mine grew until august before I started pulling them up and feeding them to the chickens that they have dropped seeds and well those seeds took to sprouting in sept in the old chicken coop so now I will have lettuce once again with out planting the tiny seeds. for the ones I thought about saving I pulled them and hung the plants up side down with a garbage bag over the seed pods so when they dried they would be captured. this worked well and will plant them in spring.