Q: I thought this was henbit but the leaves are furry purple/magenta besides being green. Do you know what this sort of invasive plant is?
A: It’s purple deadnettle, which has a similar appearance to henbit. Both broadleafed weeds sprout in October and become rampant in early spring.
The best treatment in winter and spring is to dig it or spot-spray with a broadleaf weed killer (click for sources).
You could also apply imazaquin (click for sources) but be sure to read and follow the label directions.
Next September, apply a pre-emergent (click for sources) that specifically lists henbit or deadnettle on the label.
Henbit vs Deadnettle ID
Purple deadnettle
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