The only place I have a problem with Henbit is where the soil is bare. The areas with a good mulch do not allow the seeds to germinate. Never have bare, exposed soil in the garden. Always cover any soil with a mulch for fewer "weed" problems.

Henbit is a cool season weed that produces seeds in the fall. To kill henbit you have to treat with a pre-emergent in the fall to early spring. The best is Isoxaben, just follow the instructions on the container.

I have found great results with covering the soil with 4 sheets of newspaper and then putting mulch on top. This blocks weeds from growing again and seeds from sprouting. But it stills allows water and air to get in.

Try a small area and see how you like it!

"To kill henbit you have to treat with a pre-emergent in the fall to early spring. "
No. A good mulch would be far better then any pre emergent plant poison, and much less expensive.

Is it really Henbit? Lamium purpureaum keeps getting ided as Lamium amplexicaule on these forums. Not that it makes much difference to the strategy. They're both annuals and can be forked out quite easily. Once that's done a think mulch will prevent the rest of the seeds germinating.