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.
Bloodgood. Japanese maples leaf out early in the spring. If the winter was unseasonably warm, the tree may think it is spring and leaf out too early. Even if they leaf out on schedule, there may be a late cold spell in the spring.ater. Too little water will stress your maple, causing leaves to wilt, brown and drop. In hot or dry weather, supplemental irrigation is necessary to keep the maple healthy. Water the tree deeply and keep the soil moist but not wet.