Kerria japonica ‘Pleniflora’
Habit: Upright normal shrub, 1.5-2 m tall and wide; fast-growing.
Flowers: Like little roses, double, golden yellow flower balls in May, with second blossoms.
Roots: Flat, many runners, up to 1.5 m from shrub.
Other: See K. japonica.
Note: To secure flower production, cut off old shoots.
Hardiness: Zone 5a