The discovery that weeds like it outside the south wall of the greenhouse. So, today I took a spray bottle of vinegar to them and had at it! They are small enough that it should only take the one application to get rid of them. All I had was household vinegar which is diluted, but have been told that you can get horticultural grade vinegar which is full strength, but haven't gotten my hands on it yet. Hot sunny days seem to work best.
Talk about organic weed killer!
I am thinking that this spring I will plant some groundcover here to help with the weed control. No light, no germination. Ha HA! It all depends on how much of the irrigation system we get put it before it gets too hot out. Got to love the desert heat!