Secretion of GH by the pituitary into the bloodstream stimulates the liver to produce another hormone called insulin-like growth factor I (IGF-I). IGF-I is what actually causes tissue growth in the body. High levels of IGF-I, in turn, signal the pituitary to reduce GH production.
Site and Spacing. 1  The pawpaw is a small tree that typically grows to about 20 feet high and less broad. 2  In an orchard setting, tree centers should be at least 10 feet apart. Row widths depend on the size of tractors and equipment -- 20 foot rows may be a minimum width.
Paw Paw. The Paw Paw is an ornamental, fruit-bearing tree. Itâs sure to turn heads if planted near your street or by the front entrance of your home. Planting a Paw Paw is a great way to bring a bit of tropical allure to your yard without concerns about harsh weather. The Paw Paw can tolerate cold temperatures, even as low as -25F.