How to Burn a Prairie
Burning is one of the most important management practices for native plantings
Most native plantings, after two or three growing seasons, need to be burned annually for the next five or more years to become well established. Burning yields better growth and more flowers. Mature prairies with no weed problems may need burning only once every three years.
When a large planting reaches seven years, it can be divided into three sections with mowed paths between them. Burn a different section each year, thereby protecting over-wintering butterflies and other insects. If a planting is not periodically burned, a thatch layer can build up over the years, causing some native species to grow poorly or even to die out completely.
Burning in March or April will stimulate growth of native plants and give them a competitive edge over weeds. Always use caution and common-sense when burning. Follow local fire regulations, obtain permits and have plenty of tools and help on hand. For more detailed information, we recommend the booklet How to Manage Small Prairie Fires by Wayne R. Pauly.
More good burning information is available from the Prairie Enthusiasts.
Always plan fire safety into plantings, even if you will not be using burn management. Prairie fires, accidental or intentional, can burn very rapidly during spring or fall dormancy. Use existing features, such as roads, driveways, streams, lakes and mowed lawns, as firebreaks. Include a wide path around the perimeter as well as paths through your planting. We advise a mowed lawn buffer at least 40 feet wide between buildings and prairie.
An alternative to burning
If burning is not permitted at your site or if you prefer not to use this method, you can mow or manually remove thatch in early spring (late February to mid-April). Last year’s dead stems will not hide the new growth and flowers, and the sun’s rays still will be able to warm the soil.