Jackman Cinquefoil Potentilla needs full sun or light shade. A little shade during the heat of the day keeps the plant blooming longer. It prefers moist, fertile, well-drained soil, but tolerates, clay, rocky, alkaline, dry or poor soils. Strong disease and insect resistance makes growing Potentilla easy. Here are some tips on how to care for Potentilla: Water Potentilla shrubs during prolonged dry spells. The plant survives without consistent watering but thrives when it gets plenty of moisture. This Native American shrub grows wild in boggy soils. Give the shrub a shovelful of compost in late spring as the flower buds begin to swell, or fertilize it with a complete fertilizer. At the end of the flowering season, cut out the old branches at ground level or rejuvenate the shrub by cutting the entire plant back to ground level and allowing it to regrow. After a few years, it takes on an awkward shape unless you cut it all the way back. Use organic mulch to help the soil retain moisture and discourage weeds. Pull back the mulch before the first freeze, and then push it back around the plant when the ground is frozen. Typically grows 3' x 3'.