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.
Peas âSow seeds in early spring as soon as the soil can be worked. Plants stop bearing when hot weather arrives. A fall planting may be made about August 1 to 10. Spinach âSow seeds in April as plants become bitter and form seed heads with the onset of hot weather. A fall crop may be planted about August 10. Cabbages âSet out transplants from early April to May 1 for a summer crop.