March 28
Bronx: The Orchid Show: Brazilian Modern. Through 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.

Garrison: Volunteer Landscape Day. Topic: Caring for trees with arborist with Chris Galligan. Free. 9 a.m.-2 p.m. Manitoga/The Russel Wright Design Center, 584 Route 9D. 845-424-3812.

Yorktown Heights: Composting with Worms. Topic: learn how to build a worm bin and care for them. Registration. Free. 10 a.m.-noon Hilltop Hanover Farm and Environmental Center, 1275 Hanover St. 914-962-2368.

March 29
Bronx: The Orchid Show: Brazilian Modern. Through 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 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 2
Mahopac: Master Gardener’s Secrets. Speaker: Cornell Cooperative Extension master gardeners. Topic: soil, conifers, perennials. Registration. Free. 7 p.m. Mahopac Public Library, 668 Route 6. 845-628-2009.

April 3
Congers: Rockland Audubon Society Nature Program. Speaker: Charlotte Zoe Walker. Topic: “John Burroughs and the Art of Seeing Things.” Free. 8 p.m. Rockland Country Day School, 34 Kings Highway. 845-639-9216.

April 4
Valley Cottage: Getting the Lawn and Garden Ready for Spring. Speaker: Master gardeners from Cornell Cooperative Extension. Topic: tips on cleanup, when and how to fertilize, plant and care for your lawn and garden. Free. 10-11 a.m. Valley Cottage Library, 110 Route 303. 845-268-7700.

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 8
New Rochelle: Garden Club of New Rochelle Meeting. Speaker: Barbara Schaefer. Topic: handbook designs. Free. 2 p.m. Elks Lodge, 19 The Boulevard. 914-630-0111.

April 11
New City: In Search of Spring. Walk in Kennedy Dells with Andy Smith. Meet at the New City Library. Free. 9:30 a.m. New City Library, 220 N. Main St. 845-634-4997.

Tarrytown: Spring Bulbs. Speaker: John Lonsdale: Topic: slide presentation on unusual bulbs; how to grow and propagate them. Free. 10 a.m. Lyndhurst, 635 S. Broadway/Route 9. 914-738-1156.

April 13
Rye: Bridge to an Organic Future: Steps to a Safe Home, Diet and Community Without Pesticides. Speaker: Jay Feldman, executive director of Beyond Pesticides, Washington D.C. Free. 8 p.m. Community Synagogue of Rye, 200 Forest Ave. 914-967-6262.

April 14
Rye: Westchester Fairfield Horticultural Society meeting. Speaker: Carol Gracie, botanist, author, photographer. Topic: “Spring Wildflowers of the Northeast: A Closer Look.” Free. 6 p.m. Rye Free Reading Room, 1061 Boston Post Road. 203-661-8626.

April 15
Chappaqua: Chappaqua Garden Club. Speaker: Bernie Gastrich, former president of the Yama Ki Bonsai Society. Topic: how to grow bonsai from nursery stock and the scupltural aspects of bonsai. Free. 12:45 p.m. First Congregational Church, 210 Orchard Ridge Road. 914-242-3799.

Ossining: Cornell Home Gardening Lecture Series. Speaker: Joan Gussow. Topic: “Confessions of a Suburban Homesteader.” $12 in advance, $15 at the door. 10 a.m.-noon Mariandale Retreat and Conference Center, 299 N. Highland Ave. 914-285-3590.

April 18
Garrison: Volunteer Landscape Day. Topic: Woodland paths of Manitoga with landscape designer Grace Kennedy. Free. 9 a.m.-2 p.m. Manitoga/The Russel Wright Design Center, 584 Route 9D. 845-424-3812.

April 19
Bedford: Butterfly Gardening. Registration. $8. 1 p.m. Westmoreland Sanctuary, 260 Chestnut Ridge Road. 914-666-8448.

Ossining: The Early Birder. Meet at Cliffdale Farm to search the fields for bluebirds and early spring migrants. Registration. Free. 9 a.m. Teatown Lake Reservation, 1600 Spring Valley Road. 914-762-2912.

April 20
Pearl River: Tree Care. Speaker: A representative from Ira Wickes Arborists. Topic: proper way to plant and care for trees. Free. 7 p.m. Pearl River Public Library, 80 Franklin Ave. 845-735-4084.

April 22
Chappaqua: Rocky Hills Lecture Series. Speaker: garden writer and photographer Ken Druse discusses his latest book, “Planthropology: The Myths, Mysteries, and Miracles of My Garden Favorites.” Free. 7:30 p.m. Chappaqua Public Library, 195 S. Greeley Ave. 914-238-4779.

April 23
Mahopac: Healthy Gardens, Healthy Children, Healthy Planet. Speaker: a representative from Cornell Cooperative Extension. Topic: learn how you can grow a lush green lawn, beautiful flowers and lots of vegetables without exposing children to fertilizers and pesticides. Registration. Free. 7 p.m. Mahopac Public Library, 668 Route 6. 845-628-2009.

April 25
Ossining: Backyard Birding. Instructor: Phyllis Bock. Topics: identification skills, use of binoculars and bird guides along with information on attracting and feeding birds. A portion of the program will be outdoors. Registration. $30. 9 a.m. Teatown Lake Reservation, 1600 Spring Valley Road. 914-762-2912.

Valhalla: Wildflower and Native Plant Sale. 11 a.m. Native Plant Center, Westchester Community College, 75 Grasslands Road. 914-606-7870.