Master Gardeners

In 2003, Warren County held its first Master Gardener program. Since that time, the Master Gardeners have taken on several community projects. One of those projects include maintaining the landscaping and grounds around the Schowengerdt Historical Home in Warrenton. 

photo: Schowengerdt Historical Home

Schowengerdt Historical Home in Warrenton,
a Master Gardener project

Master Gardeners are individuals who enjoy learning and sharing their gardening knowledge with others. There are no prerequisites to participate in Master Gardener training, except to have an interest in gardening, a willingness to learn and a desire to give back to local communities through volunteer service and education.

After completing training, Master Gardeners expand the reach of University of Missouri Extension using research-based horticultural information to answer gardening questions in their local communities.

We are proud to announce that the Master Gardener training course is now available online at:


Train online to be a Missouri Master Gardener


June Garden To-Do List  

Fruit drop: Early fruit drop is a natural thinning process. Prop up heavy branches to prevent breaking. Fruit should be spaced 6 to 8 inches apart on a branch.

Tomatoes: For staked tomatoes, remove suckers when they are 1 – 1.5 inches long.

Stop harvesting: Stop harvesting asparagus and rhubarb by the end of the month. This permits plenty of time to store nutrients for next year.

Cauliflower: Block light from cauliflower when heads are 2 inches across and tie leaves over the developing heads.

Phlox: Trim back garden phlox stems to improve air circulation. Thin out all but the 5 strongest stems on each plant to prevent mildew.

Insects: Use floating row covers as an insect barrier for spinach, beets, carrots and the cabbage family. This acts as a barrier to keep adults from laying eggs.

Greens: Harvest cool season crops like lettuce, radishes and spinach to prevent bolting. Replant with summer vegetables or a cover crop like buckwheat.

Weeds: Use 100% vinegar to kill annual weeds like foxtail, pigweed, and Canada thistle. Use full strength and spray directly on young weeds as they appear.

Houseplants: Move houseplants outside for the summer. Be sure to water as needed and watch for insects.

Strawberries: Keep birds away by covering with netting.

Compost tea: Place several shovels of compost into a burlap bag. Tie the bag & soak in a 30-gallon trash can full of water. Cover and allow to set for several weeks before using.

For any questions please contact the Warren County Extension Center 636-456-3444