March 14
Bronx: The Orchid Show: Brazilian Modern. Feb. 28-April 12. In the Enid A. Haupt Conservatory. $20, $18 seniors and students, $7 children. 10 a.m.-6 p.m. New York Botanical Garden, 200th Street and Kazimiroff Boulevard. 718-817-8700.

Patterson: Basics of Garden Design. Speaker: a representative from Cornell Cooperative Extension of Putnam . Free. 2 p.m. Patterson Library, 1167 Route 311. 845-878-6121.

March 15
Bronx: The Orchid Show: Brazilian Modern. Feb. 28-April 12. In the Enid A. Haupt Conservatory. $20, $18 seniors and students, $7 children. 10 a.m.-6 p.m. New York Botanical Garden, 200th Street and Kazimiroff Boulevard. 718-817-8700.

March 16
Valhalla: Landscaping Conference: Investing in Ecology: Native Gardens and Natural Processes. $122. 9 a.m.-5 p.m. Native Plant Center, Westchester Community College, 75 Grasslands Road. 914-606-7870.

March 17
Ossining: “Greening” Your Backyard. Instructor: Linsay Cochran. Topic: how you can care for your lawn and garden using ecologically responsible methods. $20. 7 p.m. Teatown Lake Reservation, 1600 Spring Valley Road. 914-762-2912.

March 18
Chappaqua: Native Plants. Speaker: Barbara Fischer. Free. 12:45 p.m. First Congregational Church, 210 Orchard Ridge Road. 914-242-3799.

March 19
White Plains: Bronx River-Sound Shore Audubon Society. Speaker: Micky Cohen presents a slide illustrated walk along Long Island beaches. Free. 7:30 p.m. Church Street Elementary School, 295 Church St. 914-834-5203.

March 25
Yonkers: Butterfly Garden. Sponsor: Hudson River Audubon Society. Free. 7:30 p.m. Lenoir Nature Preserve, 19 Dudley St. 914-237-9331.

March 26
West Nyack: Applying Ecology to Landscape. Speaker: Donna Cooke of Cornell Cooperative Extension. Topic: techniques for improving lawns and gardens. Registration. Free. 7:30 p.m. West Nyack Free Library, 65 Strawtown Road. 845-358-6081.

March 28
Yorktown Heights: Composting with Worms. Topic: learn how to build a worm bin and set your worms up in a comfortable environment. Registration. Free. 10 a.m.-noon Hilltop Hanover Farm and Environmental Center, 1275 Hanover St. 914-962-2368.

March 31
Palisades: Flower Arranging. Free. 7 p.m. Palisades Free Library, 19 Closter Road. 845-359-0136.

April 1
West Nyack: Annuals and Perennials. Speaker: a representative from Cornell Cooperative Extension. Topic: how different types of plants create a beautiful garden. Registration. Free. 7:30 p.m. West Nyack Free Library, 65 Strawtown Road. 845-358-6081.

Yorktown Heights: Garden Club of Yorkown. Speaker: Patricia du Plessis of Rainbow’s End Butterfly Farm and Nursery. Topic: “Attracting Butterflies — Backyard Habitat and Sustainable Gardening.” Free. 7:30 p.m. Yorktown Community & Cultural Center, 1974 Commerce St. 914-393-8759.

April 6
Montrose: Create an Easter/Spring Floral Arrangement. Instructor: Lisa Cesarini. Reservations. $20 material fee. 7 p.m. Hendrick Hudson Free Library, 185 Kings Ferry Road. 914-739-5654.

April 12
Bronx: The Orchid Show: Brazilian Modern. Feb. 28-April 12. In the Enid A. Haupt Conservatory. $20, $18 seniors and students, $7 children. 10 a.m.-6 p.m. New York Botanical Garden, 200th Street and Kazimiroff Boulevard. 718-817-8700.