Progesterone. Print | Email article to a friend | Last updated: January 14, 2015. Progesterone is a hormone released by the corpus luteum in the ovary. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. It may also be involved in the growth of certain cancers.
Maple helicopters fall before the leaves drop from the trees. Maple trees (Acer spp.) produce winged seeds called double samaras, which twirl to the ground in late summer or early fall. They resemble helicopters in motion, earning them the common name of helicopters or whirligigs.
Collards and kaleâSeed at the same time as lettuce and. other early spring crops. Direct-seed in early July for a fall crop. CarrotsâSeeds can be sown from early April to August 1. Plant. every 3 to 4 weeks for a continuous harvest. Beets and Swiss chardâ Seeds can be sown from early.