Arnold Promise Witchhazel is bathed in stunning fragrant yellow strap-like flowers with red calyces along the branches from late winter to early spring before the leaves. It has green deciduous foliage. The serrated round leaves turn an outstanding yellow in the fall.
Arnold Promise Witchhazel is a multi-stemmed deciduous shrub with a ground-hugging habit of growth. Its average texture blends into the landscape, but can be balanced by one or two finer or coarser trees or shrubs for an effective composition.
Arnold Promise Witchhazel will grow to be about 15 feet tall at maturity, with a spread of 15 feet. It has a low canopy with a typical clearance of 2 feet from the ground, and is suitable for planting under power lines. It grows at a medium rate, and under ideal conditions can be expected to live for 40 years or more.
This shrub performs well in both full sun and full shade. It is quite adaptable, prefering to grow in average to wet conditions, and will even tolerate some standing water. It is not particular as to soil type, but has a definite preference for acidic soils, and is subject to chlorosis (yellowing) of the foliage in alkaline soils. It is somewhat tolerant of urban pollution. This particular variety is an interspecific hybrid.