Use a quality Rose type fertilizer' to feed them. Of course, read and follow application directions on the label. Grows about 3 feet tall and 4 feet wide. This one only grows about a foot high, but may spread two or three feet in width. An excellent ground cover variety.
Flowers are a bright yellow.
Red Ace - Open flowers are red, with the underside of the flower petals being yellow. Entire flower color may turn yellow in extreme heat. In addition to the shrub type Potentillas there are several perennial varieties that certainly merit a place in the northwest garden. If you're looking for a shrub that flowers most of the summer, you should take a good look at the various varieties of Potentilla fruiticosa.