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, Lamium purpureum, which has a similar appearance to henbit, Lamium amplexicaule. 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 Bioadvanced Season Long Weed Control (click for source), Weed B Gon (click for source), or Bonide Weed Beater Ultra (click for source)
You could also apply Image Kills Nutsedge (click for source) but be sure to read and follow the label directions.
Next September, apply a pre=emergent, like Fertilome Broadleaf Weed Control with Gallery (click for source) that specifically lists henbit or deadnettle on the label.