Today

Heronswood Open, Heronswood Nursery event with rare-plant sales, garden talks, featured speaker Steve Silk (of Fine Gardening magazine), tour of nearby private gardens and Fordhook Farm's trial and display gardens; 10 a.m to 5 p.m. today and tomorrow. $5 per day; (talks $10 each; registration required); benefits Garden Conservancy Open Days Program. Burpee's Fordhook Farm, 105 New Britain Rd., Doylestown; 215-674-4900, Ext. 1401.

Tomorrow

Auction and picnic: members' plants and garden items, orchids from Walter Annenberg greenhouses, tropical plants from the Barnes Foundation, perennials; picnic sponsored by the Hobby Greenhouse Association, Delaware Valley Chapter; 10 a.m. to 1 p.m. Free; bring own food for picnic, garden trays or boxes for plants. Horticultural Center, North Horticultural Drive and Montgomery Avenue, Fairmount Park; 610-446-2160, wiener1@verizon.net.

Monday, May 21

Slide talk on ferns photographed in their natural habitat in various U.S. states by fern expert Jack Schieber at the Trevose Horticultural Society's meeting; 7:30 p.m. Fee: $2. Wood River Village Auditorium, Hulmeville Road and Bensalem Boulevard, Bensalem; 856-866-9163.

Plant sales

Montgomery County Master Gardeners, at the Montgomery County 4-H Center parking lot, 1015 Bridge Rd. (Route 113), Skippack; 610-489-4315. Free. Woody plants, perennials, herbs, annuals, pond plants, vegetables, fruits; used garden items; plus auction (11 a.m.), kids' activities, more; 9 a.m. to 3 p.m. tomorrow.

Tamanend Park Herb Club, at Tamanend Park, Second Street Pike south of Bristol Road, Upper Southampton. Call 215-442-1679 no later than noon today for directions or to reserve plants. Free. Culinary, medicinal, ornamental and fragrant herbs, plus tea and scones (tomorrow only), herbal crafts, tours of herb garden; 9 a.m. to 5 p.m. tomorrow and 9 a.m. to 3 p.m. Sunday.

Bowman's Hill Wildflower Preserve, River Road (Route 32), New Hope; 215-862-2924; www.bhwp.org. Nursery-propagated wildflowers, vines, ferns, shrubs, trees; 10 a.m. to 4 p.m. tomorrow and Sunday.

Up ahead

Amateur iris growers are invited to exhibit all types at the Delaware Valley Iris Society's Iris Spectacular May 26 at Tyler Arboretum, but must make arrangements to enter their iris prior to the show with the chairperson; 610-334-8003, dbsawer@nni.com.

Creating garden structures, hands-on class from 10 a.m. to 2 p.m. June 2. Fee: $50; pre-registration required; bring clippers, loppers, pruning saw and hammer if available. Morris Arboretum, 100 Northwestern Ave.; 215-247-5777, Ext. 125 or 156; www.morrisarboretum.org.

Pennsylvania Horticultural Society requests nominees for its City Gardens Contest by June 10. Free. Categories include flower, vegetable, or container gardens, parks and sitting parks, garden blocks, community gardens, churches, schools, businesses, rooftops, decks and patios. For information and entry form: 215-988-8897; www.pennsylvaniahorticultural society.org/events/city_contest.html.

- Jerene Schroeder

Submit items for "Garden Calendar" three weeks in advance to jschroeder@phillynews.com or at The Inquirer, Box 8263, Philadelphia 19101. Include a contact person, address and phone number.