I've planted vinca over dead grass before, and it turned into a big 'ol mess. I actually spent today digging out all the grass that somehow lived/grew, etc., in between my vinca. I'm so sore I can barely move. 200' is a loooot of digging...Hope somebody else has a better solution. You could always try, though, and cross your fingers!

So the Vinca grew -- it was the dead grass that wouldn't die that was a problem. How long did you wait before you went back to knock out the grass?

I'd like to plan now, and deal with any remaining live grass next spring. I don't have time to rip out the grass this fall, and most of it is dead. I'm concerned about whether Rooted Cuttings of Vinca would survive through the dead grass in Zone 6, if I do it now.

I planted in April (roundabouts) and pulled it up just last weekend. I don't see the harm in waiting and seeing...you never know, yours might work out just right.