This section will have some general shots of unknown cultivars.
Soil & Site
yellow flowers in early spring before the leaves emerge
simple green leaves, can have nice purple fall color
twigs yellowish brown with distinct lenticels, reminds me of pretzels
depending on cultivar 6-10 by 6-10, a rank growing shrub unless pruned to shape
flowers are produced on new wood, so prune immediately after flowering, can be pruned hard
Most of the newer cultivars have much hardier buds than the older cultivars
On the older cultivars during rough winters, only the buds on the branches buried in the snow would survive. It was a strange sight with the bottom 1/3-1/4 of the shrub yellow with flowers and the rest of the shrub none.
Notes & Reference
#01-Manual of Woody Landscape Plants (Michael Dirr),
#226-Shrubs and Vines for American Gardens (Donald Wyman)