The setting: house in a clearing in mature hardwood forest, the clearing
ringed by 70 to 80-foot tall oaks, maples, hickories, etc. Zone 6b. The
front 2/3 of the clearing, in front of the one-story house, is a "lawn"
comprised of a nice mess of weeds, grass, etc. - and, in the spring, wild
Claytonia virginica that looks lovely - that does OK being mowed. The
driveway is two gravel strips that run from the front of the lot (north),
about half way across the lawn towards the house (and have a huge red oak
between them). The lawn is punctuated by several large tree-stumps that have
nice things on or around them: one is a natural planter for petunias and
mums, one has mint, another has wild roses and one has rotted away and
yielded to a mass of intertwined 4 o'clocks and moonflowers I planted.
Looking toward the house, there's a garden frame for herbs, rhubarb, etc. on
the right (west) side of the clearing, with a small (16' x 2') flower border
in front of it. Along the front of the house are several boxwoods and a
couple of arborvitaes that were here before I was, azaleas, lilacs, hostas,
bleeding hearts, hellebores, pulmonaria, sweet box and Asarum canadense;
along the left (east) side of the house is northern bay and sweet woodruff.

The area I want to do something with, because it's so interesting-looking,
is on the left (east) side of the clearing. It's an approximately 16-foot
wide part of a slope down from a small knoll on which are two gigantic
chestnut oaks, two small maples and a gum tree. Jutting out of the slope at
an upward angle is an irregular shelf of shale, which runs for about 10 feet
of the area. There's a foot to a foot and a half of space between the rock
and the big trees, and about 3 feet width from the bottom of the
outcropping, to the driveway. The soil on top of the rocks is really just
oak leaf mold, with a lot of smaller pieces of shale that I've been picking
out of it. Dig in 6 to 8 inches, and you hit the big rock shelf. I've just
torn out a mass of honeysuckle that had overrun the area. Behind the big
trees is an understory featuring sassafras, Virginia creeper, poison ivy,
chokecherry, hackberry, more honeysuckle, and, in the spring, garlic mustard
that I've been hand-pulling each year.

I'd be interested in suggestions for two things:

* Ground-cover that would trail down over the rocks. Creeping thyme would do
OK, I think, but it's rather a long shelf to do all in one cover. I might
try some creeping phlox, except I doubt there's enough sun, even in spring.
The area gets about 3-4 hours of direct sun from the southeast, from midday
to late afternoon. The afternoon sun was enough that daylilies did OK, apart
from being eaten by deer, on the adjacent section of the slope. What about
Lamium and Woolly Veronica? I wouldn't mind encouraging the rampant Virginia
creeper to come down this way, though it would require digging up and moving
chunks of it from elsewhere, I suppose. I would try partridgeberry, except
it's been very disappointing in other areas where I'm trying to get it
started as a groundcover.

* Plants for below the shale outcropping. I don't want to tear up and
replace the soil, but will amend it. It's currently oak-leaf mold on top of
hard clay, with intermittent shale. Will leave intact a nice stand of starry
false Solomon's seal. Maybe I should just echo what's along the front of the
house and in my flower border (hellebores, hostas, sweet woodruff, Asarum
canadense, lamb's ears, columbine, bleeding hearts, coreopsis) - or, maybe
someone has other ideas? Lilies of the valley? I don't want anything too
tall, or it will obscure the outcropping, which is about 18-24" high. And I
don't want non-natives that will become invasive - although with
decades-worth of garlic mustard and honeysuckle in the woods, not to mention
a 60-foot high Norway maple, it's somewhat of a losing battle. I picked up a
couple of pots of soapwort (deadnettle) on sale the other day, but then read
more about it and destroyed those plants.