Juniper blue carpet...it will take 3 or 4 years to get established and you will be weeding during that time....but it will fill in with a dense cover that allows nothing to grow through.
Linda C

Sweet Woodruff and our native Wild Ginger are both good ground covers for shady spots. Some of the Tiarellas are runners as is Primula kisoana. Creeping phlox for part shade. Thyme and sedums for sunny areas.

I purchased 16 groundcover junipers to fill in the largest portion of 'the hill from lleh'. I'm going to keep the groundcover on the section that I've already done and give it a couple of years to fill in.

I kept resisting using junipers because everyone says they are ordinary. I've decided that a plant is never ordinary when it is the perfect solution!

Thanks for your help.

Cricket

My last house had a slope planted in vinca and crown vetch (love the vinca, hate the crown vetch). Both were there when I bought the place...and both seem to be thriving! Now I'm in a new house, and it seems that the ground covers are having a hard time on the slopes. Here I have Bishop's Weed (Snow on the Mountain) and the yellow archangel you have...but neither seem to have a good hold, and they were planted three years ago.

A north hill is probably too shady for juniper, which does best in full sun. I did well with vinca major, an evergreen trailing vine. A few prostrate gardenias might work IF you get enough sun. But, those only spread a few feet. There are a few types of ferns that are considered 'runners', but those will prefer more moisture and may be better for near the bottom of the hill.