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Hardiness: USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Sun Exposure: Light Shade
Danger: N/A
Bloom Color: Bright Yellow
Bloom Time: Late Winter/Early Spring Mid Winter
Foliage: Deciduous Good Fall Color
Other details: Flowers are fragrant Average Water Needs; Water regularly; do not overwater Provides winter interest
Soil pH requirements: 5.1 to 5.5 (strongly acidic) 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic)
On Mar 9, 2008, ViburnumValley from Scott County, KY (Zone 5b) wrote:
'Arnold Promise' witch hazel is the first of this fine species that I had the pleasure to become acquainted with (and plant for myself) back in the 1980s.
I have enjoyed this large-growing shrub to small tree sized plant and its copious late winter and early spring fragrant bright yellow blooms. The only downside to 'Arnold Promise' performance is that it often overlaps in bloom time with the ubiquitous forsythia around central KY. Given the choice, most gardeners know what a forsythia is, and nurseries will sell them a thousand to each one witch hazel.
This is a fine plant, but it is rapidly being superceded by newer selections that bloom earlier in the winter when there is little to no competition.
On Nov 22, 2004, Todd_Boland from St. John's, NL (Zone 5b) wrote:
This is probably the most well known witch hazel and rightly so; the flowers are among the largest of the witch hazels and are a brilliant yellow. It was a selection made at the Arnold Arboretum, Mass., in 1963. This cultivar also has excellent fall colour.
Regional...
This plant has been said to grow in the following regions:
Little Rock, Arkansas Peoria, Illinois Clermont, Kentucky Georgetown, Kentucky Lexington, Kentucky Louisville, Kentucky Dearborn Heights, Michigan Scotch Plains, New Jersey Corvallis, Oregon Coatesville, Pennsylvania Port Orchard, Washington Seattle, Washington