Organic workshop, all-day workshops on composting, planting and growing organically, natural pest and weed control and good bugs for your garden, O’Donal’s Nurseries, Gorham, free. 839-4262. 10 a.m. to 3:30 p.m. today.

Growing Fruit Trees, Merryspring Nature Center, Camden, $5, Free for members. 236-2239. www.merryspring.org. With Dr. Renae Moran of the University of Maine Cooperative Extension, noon Tuesday.

Roof runoff, rain gardens, and rain barrels, Sebago Lake Ecology Center, Standish, Free. 6:30 to 8 p.m. Wednesday.

National Public Gardens Day, visitors who bring in a coupon available in a spring issue of Better Homes and Gardens or at www.BHG.com, will receive two admissions for the price of one, Coastal Maine Botanical Gardens, Boothbay. www.MaineGardens.org. 9 a.m. to 5 p.m. Friday.