Ossining: Wildflower Island Tours. Reservations; access to the island only on tours. Children must be 12 years or older. $6. 10 a.m. Teatown Lake Reservation, 1600 Spring Valley Road. 914-762-2912.
Scarsdale: Garden Conservancyâ€™s Open Days Program. Self-guided tour of six Westchester County private gardens. Tour begins at the Zimbard Garden, or the Sieh-Takata Garden, 100 Little Town Lane, Bedford; the Warden Garden, 531 Bedford Center Road, Bedford Hills (10 a.m. to 6 p.m.). Additionally, directions will be provided to the Merrin Garden in Cortlandt (10 a.m. to 2 p.m.), the Shanti Garden in Bronxville and the Spiro Garden in New Rochelle at each location. No reservations required; rain or shine. $5 per garden. 10 a.m.-4 p.m. Garden of Fran and Alan Zimbard, 91 Penn Road. 888-842-2442.
Valhalla: Lady Bird Johnson Demonstration Garden and the Stone Cottage Garden Tours. Free. Noon to 4 p.m. Native Plant Center, Westchester Community College, 75 Grasslands Road. 914-606-7870.
Ossining: Wildflower Island Tours. Reservations; access to the island only on tours. Children must be 12 years or older. $6. 10 a.m. Teatown Lake Reservation, 1600 Spring Valley Road. 914-762-2912. Also Aug. 2, 9 and 16.
Stony Point: Home Gardening Classes. Topic: Gardening with Herbs. Registration. $5. 2 p.m. Cornell Cooperative Extension of Rockland County, 10 Patriot Hills Drive. 845-429-7085.
Chappaqua: Saw Mill River Audubon, Butterflies at Pruyn. Trudy Battaly leads a walk of the garden and meadow at the height of the butterfly season. Meet at the garden/office entrance. Free. 10 a.m. to noon Pruyn Sanctuary, 275 Millwood Road. 914-666-6503.
Cold Spring: Evening in the Garden. Self-guided tour through an English-style flower garden, alpine and rock gardens, a bamboo grove. $5. 5 to 8:15 p.m. Stonecrop Gardens, 81 Stonecrop Lane. 845-265-2000.