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All these veggies will go to
All these veggies will go to seed eventually. Lettuce can need some help for the flowering stalk to emerge. Try using a knife to slit the heads partially open. The seeds will start to ripen though it may take 2 weeks. Your broccoli should throw up a tall flower stalk covered in lots of small yellow flowers. The flowers should form slender seed pods. Once they begin to look dry, cut the plant and remove the seeds from the pods.