Pleniflorus (Double Buttercup). 15".
Vigorous and handsome groundcover for sun, part shade. Z4.
Gold variegated Buttered
Popcorn needs restraint!
RHEUM (Rhubarb). We have the edible kind, and palmatum
which is chiefly ornamental, having showy reddish flowers
and purple-tinged leaves. This makes a fine large specimen
plant for full sun. TIP: Even on the edible varieties, the
leaves are poisonous if eaten; best to cut them off right
in the patch, and lay them around the base of the plant; they
will smother weeds and return nutrients to the soil.
RODGERSIA. Large, bold plants with summer flower plumes similar
to Astilbe. Aesculifolia
has palmate leaves and broad pyramids of creamy pink flowers.
supposedly more refined. Needs rich, but well-drained,
soil and light shade. See also Astilboides.
Matthew says he bought it because everybody needs a plant
named Roscoe, but its really part of his scheme to make rock
gardeners of us all. Large, purple, hooded flowers. Its described
as robust by growers.
RUDBECKIA (Yellow Coneflower, Black Eyed Susan). Black
Beauty is a unique tall (to 48) selection, named for its
black cones, ringed by a gold band. New in 2003. PPAF.
Storm) is the best known cultivar. Its foliage is dark green
and neat while the flowers have the delicacy of the wild Black
Eyed Susan, which is a biennial with poor foliage. Goldsturm
is truly perennial and multiplies by crown growth as well
as by seed (though there will be slight differences in plants
from seed). We are very fond, too, of the species triloba--many
small flowers on a 3-4' bush. It just keeps going and going...but
seeds a lot!
Let's not forget the large-flowered, rough-foliaged species
known popularly as Gloriosa Daisy. The Indian
Summer strain puts on a good show, as does Toto--Indian
Summer's little brother, at 12-15". The gloriosa daisies
are often short-lived, but promote themselves from seed.
is a 5-ft beauty with grayish leaves and dark yellow petals
surrounding a large cone. Our absolute favorite is nitida
Sun). It has lemon yellow single blooms with a lime green
cone; it flowers for a long period. It has behaved well here
for several years, making a 5 ft. plant that stands tall through
all kinds of weather. Propagate it by division; seedlings
are not as sturdy.
RUELLIA humilis (Wild Petunia) is a 12-24 Midwest native
with 1-2 lavender flowers in July and August. Half hardy.
(Red-Veined Dock). 15. This is a member of the sorrell family
which has striking young leaves and makes a nice accent or
groundcover in sun. Zones 5 9.
RUTA (Rue). Blue
Mound attains similar size and shape to Silver Mound artemisia.
Its blue-green foliage is similar to that of columbine, but
finer. A welcome variation in texture and color. Yellow flowers
are insignificant. Sun and sandy soil make it happiest.