Tom's Blog

Wednesday, July 8, 2015

Woodland sunflower invasion

Woodland sunflower (Helianthus divaricatus) is definitely an invasive species and can take over prairies, savannas, pastures, and even backyards. I get questions about how to control it.

The only way I have found to control it is with herbicide. For large patches, spray with glyphosate, since this herbicide does not leave any residual activity in soil. Then burn the thatch and replant the bare area.

For small areas, use the Garlon 4 spritz technique, which is described in this link. Time-consuming but effective. However, you must return next year and catch any new plants that may pop up from underground roots.


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