March 31: 32nd annual Gardener's Gathering. Workshops, community garden awards and more. 11 a.m.-5 p.m. Curry Student Center, Northeastern University, 360 Huntington Ave., Boston. 617-542-7696 or bostonnatural.org.

April 1: Annual Spring Open House at Tower Hill Botanic Garden. 10 a.m.-5 p.m. 11 French Drive, Boylston. 508-869-6111 X10 or towerhillbg.org.

April 4: ``A Pattern Garden: The Essential Elements of Garden-Making,'' a class with author Valerie Easton. 7-8:30 p.m. $20 Arnold Arboretum member, $25 nonmember. Arnold Arboretum, 125 Arborway, Jamaica Plain. 617-524-1718 or arboretum.harvard.edu.

April 5: ``Rain Gardens: Beautiful Water-Saving Designs,'' a class with landscape designer Dori Smith. 6:30-8:30 p.m. $40 Arnold Arboretum member, $50 nonmember. Arnold Arboretum, 125 Arborway, Jamaica Plain. 617-524-1718 or arboretum.harvard.edu.

April 14: 75th anniversary season at Garden in the Woods. Trails open; plant sales begin. Open daily, 9 a.m.-7 p.m., rain or shine. $7 adults, $5 seniors, $3 youths ages 6-18. 180 Hemenway Road, Framingham. 508-877-7630 or www.newfs.org.

April 20: Native plant sales begin at Nasami Farm, New England Wildflower Society's native plant nursery. Free seminars May 6, 13, 20, 27 and June 3 at 1 p.m. 128 North St., Whately. 508-877-7630 or www.newfs.org.

April 27-28: Spring Plant Sale, Middlesex Conservation District. Tree and shrub seedlings, perennials, fruits, herbs, groundcovers and garden supplies. Proceeds benefit conservation programs. Friday, 3-6 p.m.; Saturday, 8 a.m.-noon. 4-H Fairgrounds, South Chelmsford Road, Westford. 978-692-9395 or middlesexconservation.org.

May 6: Annual Plant Society Sale. Choice gesneriads, begonias and perennials. 10 a.m.-3 p.m. University of Massachusetts Eastern Extension Center, 240 Beaver St., Waltham. 617-479-3680 or www.bostongardens.com.

May 8: Breakfast with the Curator. Meet the Massachusetts Horticultural Society's Gardens Curator, Peter Hinrichs, and pick up practical gardening tips. 9-11 a.m. Elm Bank Horticultural Center, 900 Washington St. (Rte. 16), Wellesley. 617-933-4900 or masshort.org.

May 12: Plant sale sponsored by Country Gardeners of Georgetown. 9 a.m.-1 p.m., corner of Park and Main streets.

May 12: Plant sale sponsored by Holliston Garden Club. Congregational Church Green, Rte. 16. 9 a.m.-noon. www.hollistongardenclub.org.

May 12: Plant sale sponsored by Littleton Country Gardeners. Littleton Town Common. 8:30 a.m.-2:30 p.m. (Rain date May 19.)

May 12: Plant sale sponsored by Open Gate Garden Club. First Parish Unitarian-Universalist Church, 2 Westford St., Chelmsford. 9 a.m.-2 p.m.

May 12-13: Mother's Day Weekend (free admission for moms!) at Tower Hill Botanic Garden. 10 a.m.-5 p.m. $8 adults, $5 seniors and youths ages 6-18. 11 French Drive, Boylston. 508-869-6111 or towerhillbg.org.

May 13: Lilac Sunday at Arnold Arboretum. Tour the world-famous lilac collection and picnic on the lawns. Dawn-dusk. Arnold Arboretum, 125 Arborway, Jamaica Plain. 617-524-1718 or arboretum.harvard.edu.

May 16: Plant and garden-tool sale sponsored by Lexington Field and Garden Club. 8 a.m.-1:30 p.m. National Heritage Museum, 33 Marrett Road, Lexington. lexgardenclub.org.

May 17: 78th annual tour of Hidden Gardens of Beacon Hill. 9 a.m.-5 p.m., rain or shine. $25 in advance, $30 on day of the tour. Send check and self-addressed stamped envelope to Beacon Hill Garden Club 2007 Tour, Box 302, Charles St. Station, Boston 02114. 617-227-4392 or beaconhillgardenclub.org.

May 17-19: Heirloom plant sale at Gore Place. New England natives, perennials, annuals, peppers, eggplants, herbs. 9 a.m.-3 p.m. 52 Gore St., Waltham. 781-894-2798 or goreplace.org.

May 19: ``Lilac Care and Culture,'' a workshop with Stephen Schneider, Associate Manager of Horticulture at Arnold Arboretum. 9-11:30 a.m. $25 Arnold Arboretum member, $30 nonmember. Arnold Arboretum, 125 Arborway, Jamaica Plain. 617-524-1718 or arboretum.harvard.edu.

May 19: Plant sale, sponsored by Community Garden Club of Cohasset. 9 a.m.-1 p.m. Cohasset Historical Society, 106 South Main St.

May 19: Plant sale, sponsored by Hopkinton Garden Club. 8-10 a.m. Hopkinton Town Common. (Rain date May 20.)

May 19: Plant sale, sponsored by Garden Club of Mansfield. 9-11 a.m. Town Hall parking lot, 6 Park Row.

May 19: Plant sale sponsored by Reading Garden Club. 9 a.m.-1 p.m. Reading Public Library, 64 Middlesex Ave.

May 19: Spring plant swap, gardener's market and perennial divide, sponsored by Boston Natural Areas Network. 10 a.m.-2 p.m. City Natives Nursery, 30 Edgewater Drive, Mattapan. 617-542-7696 or bostonnatural.org.

May 20: Elm Bank Summer Kick-Off and Society Row Plant Sale sponsored by Massachusetts Horticultural Society. 10 a.m.-2 p.m. Elm Bank Horticultural Center, 900 Washington St. (Rte. 16), Wellesley. 617-933-4900 or masshort.org.

May 24: Floral Way Festival and plant sale sponsored by Wakefield Garden Club. 9 a.m.-2:30 p.m. Hartshorne House, 41 Church St., Wakefield.

June 2: 22nd Annual Plant Sale at Tower Hill Botanic Garden. Perennials, herbs, shrubs and trees, native plants, houseplants, annuals, vegetables and Tower Hill souvenir plants. 11 a.m.-4 p.m. $1 parking. 11 French Drive, Boylston. 508-869-6111 or towerhillbg.org.

June 2: Container planting workshop with master gardener Gretchen LeTowt. 9 a.m.-noon. $80 MassHort members, $96 nonmembers. Elm Bank Horticultural Center, 900 Washington St. (Rte. 16), Wellesley. 617-933-4900 or masshort.org.

June 6: ``Thinking Outside the Box - Creative Approaches to Container Gardening,'' a class with Deborah Trickett of The Captured Garden. 6:30-8:30 p.m. $30 Arnold Arboretum member, $36 nonmember. Arnold Arboretum, 125 Arborway, Jamaica Plain. 617-524-1718 or arboretum.harvard.edu.

June 9: Garden tour sponsored by Lexington Field and Garden Club, featuring 10 Lexington gardens. Tickets: $20 at local garden centers or by mail (check for $21 to LFGC) from LFGC, 9 Tyler Road, Lexington 02420. lexgardenclub.org.

June 10: Plant sale at Garden in the Woods. Largest plant sale in the Northeast. 180 Hemenway Road, Framingham. 508-877-7630 or www.newfs.org.

    Mark your calendar for two April events to benefit the Virginia Thurston Healing Garden in Harvard, which provides nonmedical services for women with breast cancer and their families:

     Wine 101: Wine and wisdom from seven California vintners, plus hors d'ouevres and a raffle for designer shoes. April 27, 6-8 p.m. Back Bay Events Center, 180 Berkley St., Boston. Tickets: $50; 978-456-3532 or healinggarden.net.

     Wine, Women and Shoes: A gala night of shoes and accessories from Nordstrom, Napa Valley wines and delicacies by area chefs. Shoe fashion show emceed by Lisa Hughes of WBZ-TV. April 28, 6:45-10 p.m. Back Bay Events Center, 180 Berkeley Street, Boston. Tickets: $150; 978-456-3532 or healinggarden.net