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Virginia Cooperative Extension
Horticulture Classes

Weather reminder: If Prince William County Schools close early or are closed due to inclement weather, classes and programs will be cancelled and will be rescheduled. Please call 703-792-7747 for more information.

Environment and Natural Resources (ENR) Classes

Virginia Cooperative Extension Horticulture classes are free (unless noted) and are open to the public. Pre-registration is required for classes. Note that class cancellations are determined by the weather and number of registrations. For more information or to register, call the Extension Master Gardener Help Desk at 703-792-7747 or register online using our Horticulture Class Registration Form.

Saturday in the Garden - Taught by VCE - Prince William Master Gardener Volunteers at the Teaching Garden at St. Benedict Monastery, 9535 Linton Hall Road, Bristow, 20136. All programs are free and run from 9 a.m. - noon. Registration is requested. Please call 703-792-7747 or email

May 9 - Good Guys and Bad Guys – When you see an insect on your plant do you immediately squish it? You may be targeting an ally instead of your enemy! Learn about the many insects that help us in the garden. Tips and Tricks in the organic vegetable garden. Secrets from Cooks’ Garden volunteers. MGPW Plant Sale – find some new plants for your garden! Proceeds support the Teaching Garden.

June 13 - A Walk Through the Native Bed with bed leaders, Jannell and Karen - Want to save water and have a garden that survives our dry summers? Join Master Gardener Volunteers, Linda and Sally for tips and tricks used in the Drought Tolerant bed.

July 11 - Composting - Learn how to make “black gold” by turning grass, leaves and clippings into dark brown, crumbly, sweet-smelling soil conditioner. Compost also holds moisture and nutrients for the garden so flowers and vegetables are more beautiful and abundant. Join Joe and the Master Gardener Compost team for the full story on compost. Starting Fall Vegetable Garden – Now is the time to plan to have fall salad greens and sweet root crops growing for weeks beyond the first frost. Get tips from Cooks’ Garden Master Gardener Volunteers to help you extend your vegetable season long beyond the heat of summer.

August 8 - What’s that Weed? - Get help for identifying those troublesome weeds in your lawn and garden. Sniff your way through the Fragrance garden with Ruth Johnston as she shares wisdom and experiences with plant selection and care in this beautiful garden bed.

September 12 - Fall Chores in the Garden – Join Master Gardener Volunteers as they prepare for fall and winter in the garden. Topics for discussion include clean up, plant division, soil preparation. Fall Cover Crops in the Cooks Garden – Cover crops protect soil from erosion and enhance soil productivity and health, yielding better vegetables. Cooks’ Garden Master Gardeners show you how. MGPW Plant Sale – Add some new plants to your fall garden! Proceeds support the Teaching Garden.

October 10 - Living Soil - Healthy soil is a web, retaining and cycling nutrients into the right forms at the right rates, building soil structure, suppressing disease-causing organisms, protecting plants, and decomposing toxic compounds. Learn about the necessary elements of a healthy soil web. Join the Cooks’ Garden team and learn seed saving tips.

Ask a Master Gardener your Gardening Questions - 

  • Local garden centers, 10 a.m. to 1 p.m. at Southern States, Lowe’s - Woodbridge, Lowe’s - Gainesville, Merrifield (Saturdays: May 2, 16)
  • Manassas City Farmers’ Market - 9 a.m. to 1 p.m. (Saturdays beginning April 4)
  • Dale City Farmers’ Market - 9 a.m. to 1 p.m. (Sundays beginning April 5)

Call 703-792-7747 for more information.

Full Circle of Gardening by David Roos - Wednesday, May 13th, 6:30 p.m. at the Old Courthouse (9248 Lee Avenue, Manassas) 
Join us for a very popular garden talk discussing the full circle of gardening (preparing, maintaining, and wrapping up the garden), as well as the role of natives. This talk is sponsored by Master Gardeners of Prince William. David Roos inherited his gardening and other lifelong passions from both sides of his family. He has a gardening design and consulting practice, gives garden lectures, worked in nurseries, and wrote a newspaper column. He received his design training at the New York Botanical Garden's Landscape Design certificate program in New York City. Mr. Roos' gardening philosophy emphasizes a hands-on approach and common sense practicality. Known for his strident views, Mr. Roos favors the elimination of Latin, petrochemicals, white-tailed deer, and mechanized equipment from the garden.
Please reserve your space with the Horticulture Help Desk at 703-792-7747 or

Prince William County Fair - August 14 - 22, 2015 (10624 Dumfries Road,  Manassas, VA 20112)
Have your gardening, insect and wildlife questions answered by VCE Prince William Master Gardener Volunteers at the Prince William County Fair. Check out the Master Gardener booth in the Agri-Culture Barn. Visit the Prince William 4-H Children’s Barn for hand’s on activities. Please click here for the link to the Prince William County Fair Website.

Extension Horticulture Help Desk - Drop off samples at the office or leave a message about your insect disease or gardening question. Staffed by Master Gardener Volunteers. Call 703-792-7747 or email

Help us go GREEN & save more than just a tree! For FREE lawn, landscape, and garden updates register to receive notifications by email.

Virginia Cooperative Extension complies with the Americans with Disabilities Act. If you are a person with a disability and require accommodations for a workshop, meeting or event, call (703-792-6285/TDD PC 1-800-828-1120) at least five days prior to the event.


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