Noted for its green winter stems and yellow spring flowers, Kerria japonica 'Pleniflora' (Japanese Kerria) is a vigorous suckering deciduous shrub of great beauty. In spring, it gets covered with bright yellow, pom-pom-like flowers, 2 in. across (5 cm). Borne on slender, arching stems, the blossoms resemble small roses. Easy …
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