2026 Plant America Garden Expo
Saturday, May 16, 2026
10 a.m. to 3 p.m.
The Weldon Spring Site Interpretive Center welcomes the O’Fallon Garden Club, Boone Country Garden Club, and MOGreen Future for the 2026 Plant America Garden Expo on Saturday, May 16, 2026, from 10 a.m. to 3 p.m. CST. This event is free and open to all, and features more than 30 vendors, guest speakers, demonstrations, and several family-friendly activities.
Visitors can learn about gardening, nature, and biodiversity in your backyard. Vendors will have plants and crafts for sale, and food trucks will be available during the event.
In addition to the Plant America Garden Expo festivities, Weldon Spring Site Interpretive Center will be hosting family-friendly educational activities with a focus on biodiversity.
Boone Country Garden Club
MOGreenFuture (Life Cycle of a Tree)
O’Fallon Garden Club
Missouri Prairie Foundation/ Grow Native
St. Charles Master Gardeners
Missouri River Bird Observatory
Three Rivers Beekeepers
Forest ReLeaf
Wild Ones St. Charles
Frisella Nursery
Purple Martin Coaching
Pollinator Partnership
World Space Conservation
Vibrant Spruce Herbals
St. Louis Carnivorous Plant Society
MOGreenFuture (Waste Less/ Plastic Pollution)
Missouri Bluebird Society
Wild Birds Unlimited St. Charles
Forrest Keeling
St. Charles County Parks
Sweetie Pie Blooms
3rd Rock Riches Rock Shop
Jost Greenhouse/Live-Roof Midwest
Farmers and Artisans Market
Humane Wildlife Solutions
Flora Foundry
Jennifer (Crazy Snake Lady)
Karma Soil Company
Master Naturalist Confluence Chapter
Miller’s Homestead
Dark-Sky Missouri Chapter
Xerces Society
Flutterby Interactive
Missouri American Water
El Mezon Taco Truck
Lyons Frozen Custard
Boone Country Garden Club
O’Fallon Garden Club
MoGreen Future
10:30 a.m. - Dr. Erin Hladilek, St. Charles County Master Gardener Program: Bees, Butterflies and Other Friendly Bugs: Helping Pollinators Thrive in Your Backyard Garden
11:30 a.m. - Kaylee Woelfel, Missouri River Bird Observatory: Building Bird-friendly Backyards
12:30 p.m. - Teresa Hessel – LiveRoof Midwest / Jost Greenhouses: Improving Our World, One Roof at a Time
1:30 p.m. - Carol Davit, Missouri Prairie Foundation/Missouri Invasive Plant Council: Invasive Plants in Missouri: Threats, Opportunities, and Resources
The Weldon Spring Site Interpretive Center is located in southwestern St. Charles County, Missouri,
approximately 30 miles west of St. Louis. It is located on Missouri State Route 94, 2 miles south of the Route 94 and U.S. Highway 40/61 junction.
Parking is free and available steps away from the interpretive center and the event.
Visitor safety is LM’s utmost priority - this event is outdoors, so please wear weather-appropriate clothing and bring sunscreen. Drink plenty of water to stay hydrated throughout the day. Visitors are welcome to bring water bottles to the event and can purchase water and nonalcoholic beverages at participating food trucks. Alcoholic beverages are not permitted.
The 2026 Plant America Garden Expo is a rain or shine event. However, the event may be paused, evacuated, or cancelled because of inclement weather, including but not limited to flooding, tornadoes, or as directed by emergency personnel. Weldon Spring Site Interpretive Center staff will monitor weather conditions to ensure the safest event possible. If severe weather requires an evacuation or visitors to seek temporarily shelter, please follow interpretive center staff’s instructions.
For more information on the Weldon Spring Site Interpretive Center, visit: www.energy.gov/lm/weldon-spring-site-interpretive-center. For more information on the event, please contact: PlantAmericaGardenExpoMO@gmail.com