Through Sunday, September 7: Clearance at the Herb Lyceum, in Groton. Thymes, Echinacea, culinary herbs: three plants for $5. (978) 448-6499.

Tuesday, September 9: deadline for receipt of preorders (mailed or faxed) for the Middlesex Conservation District Fall Sale (see September 26, below). (978) 692-9395.

Sunday, September 14, 10 am -3 pm: "Society Row" Sale. Waltham Field Station (UMass), 240 Beaver St. Waltham MA. Members of organizations for the following subjects will be presenting information and selling thousands of rare and unusual plants: African Violet, Bamboo, Begonia, Bromeliad, Cacti and Succulents, Carnivorous Plants, Chestnut, Conifer, Daffodil, Daylily, Epimedium, Gardeners and Florists, Gloxinia and Gesneriad, Indoor Gardeners / Hobby Greenhouse, Holly, Horticultural Therapy, HortResources Network, Hosta, Iris, Landscape Design, Lilac, Magnolia, Miniature Plants, Orchid, Primrose, Peony, Rock Garden, Rhododendron, Rose and Wildflower. Contact Art Scarpa, (781) 944-5959.

Saturday, September 20, noon - 3:30 pm: The Annual Plant Show and Sale of the American Begonia Society (Buxton/Boston Branch) and the American Gloxinia and Gesneriad Society (New England Chapter). Waltham Field Station. Anyone may enter plants in a judged competition. Many unusual varieties for sale, most grown by Society members (often from cuttings of plants in the show). Contact Jane Snellman at (617) 680-0081.

Friday, September 26, 2 - 6 pm and Saturday, September 27, 8 am - noon: Middlesex Conservation District Fall Bulb and Perennial Sale — including fall-blooming asters and mums. Proceeds fund conservation work. See their website at <http://www.middlesexconservation.org/> (there will be additional plants not listed on the preorder form on the Web ). On Route 110 north from Westford towards Chelmsford, take the first right onto South Chelmsford Road (there'll be a sign at the turn), proceed to the 4-H Fairgrounds.

Until Tuesday, September 30: Sale at Groton Nursery, on a large selection of trees and shrubs (25% - 40% off) and perennials (50% off). (978) 448-5761.

While supplies last:

• Central Mass Garden Center (Lunenburg): Most perennials, buy two, get one free; roses half price; 25% off selected shrubs.(978) 582-9400.
• Kirk Farm, 21 Wyman Road, Groton: Rosemary, $5 for a six-inch pot. 9-6:30, 7 days. (978) 448-5871.
• Lakeview Nurseries (Lunenburg): Selected trees, shrubs and perennials, 20% off. (978) 342-3770.
• Nashoba Valley Garden Center (Lunenburg): roses and potted dahlias (in bloom till frost), buy two and get two free. Selected perennials 25% - 50% off. Wooden planters and outdoor furniture; also Coast of Maine organic potting soil: 25% off. (978) 433-5570.

Middlesex Conservation District

Directions to the Waltham Field Station

The American Gloxinia and Gesneriad Society

The American Begonia Society

The Herb Lyceum at Gilson's

Kirk Farm