Arnold Promise™ Witch Hazel

‘Arnold Promise’ witch hazel is a deciduous hybrid shrub recognized for large, fragrant yellow flowers with long, curling petals and a reddish-green base. The flowers appear on bare branches in late winter, and the vase-shaped plant was selected at the Arnold Arboretum for its especially abundant, long-lasting bloom ([Arnold Arboretum](https://arboretum.harvard.edu/plant-bios/arnold-promise-witch-hazel-2/); [Oregon State University](https://landscapeplants.oregonstate.edu/plants/hamamelis-intermedia-arnold-promise)). ## Landscape Use Use this cultivar as a specimen or anchor in a winter garden, mixed shrub border, or open woodland edge. Give it space for its spreading outline and place it where fragrance and flower color can be enjoyed in the colder months. Its oval leaves provide a green summer backdrop before turning yellow to orange in autumn. ## Growing Conditions Plant in full sun to partial shade in moist, well-drained soil. The [RHS cultivar profile](https://www.rhs.org.uk/plants/89444/hamamelis-%C3%97-intermedia-arnold-promise/details) describes acid to neutral soil and mature height and spread of 2.5–4 m; Oregon State University reports sun to part shade and USDA zone 5, while the [Arnold Arboretum cultivar sheet](https://arboretum.harvard.edu/wp-content/uploads/2024/02/2024-ADS-Arnold-Promise-1.pdf) gives zones 5–8. These sources support the catalog’s broad 8–13-foot display range and the existing 4 m dimensions at the upper end, while other U.S. horticultural references report larger mature plants. Allow for climate, age, and growing conditions when siting it. ## Maintenance Water through dry periods during establishment and renew a light mulch around the root zone. Prune sparingly just after flowering to remove dead, crossing, or misplaced branches; flowers form on older growth, so heavy pruning can reduce the next display.