Redbud Crabapple - Malus x zumi 'Calocarpa'
Redbud Crabapple grows at a moderate rate to 25 feet tall and 15 feet wide [4]
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Redbud Crabapple
A hybrid of Malus baccata and Malus sieboldii, Redbud Crabapple grows at a moderate rate to 25 feet tall and 15 feet wide (can grow 30 feet wide), creating a dense, pyramidal form with weeping branch tips. True to its name, the blossoms of Redbud Crabapple start out as red buds in spring which open to soft pink flowers, eventually fading to white. These blooms are delightfully fragrant and open in spring before the new leaves appear. The small, shiny, bright orange/red fruits which follow, persist on the tree well into the winter if not first eaten by birds.  [4]

USDA hardiness zones: 4 through 8A / Planting month for zone 7: year round / Planting month for zone 8: year round

Height: to 30 feet / Spread: 15-30 feet. Plant habit: spreading / Plant density: dense. Growth rate: moderate / Texture: medium. Flower color: pink, white; very showy; pleasant fragrance .  Fruit shape: round, < .5 inch / Fruit covering: fleshy Fruit color: orange- red. Fruit characteristics: attracts birds; significant litter problem; persistent on the tree; showy [4].

Redbud crab has been described as one of the best crabapples for street tree planting. When specifying trees for street or parking lot planting, be sure to order single trunked trees with major branches located as high on the trunk as possible. This will reduce the need to prune off lower limbs to provide clearance for vehicles and pedestrians. However, branches will still need to be removed as the tree grows older due to the slightly drooping habit of the tree.

Suckers from the root system may also need to be occasionally removed. Trees planted away from walks and streets can be pruned and trained any way you like. They often look nice with branches left to the ground, forming a solid, thick, mounding shape with age. Redbud Crabapple should be grown in full sun on well-drained, acid soil. They are adapted to a variety of soils, including clays. It is recommended that you purchase trees propagated on their own roots.

No pests are of major concern. Aphids can usually be found infesting a variety of Crabapples, including this one. Control of pests is usually not needed. Although resistant to scab, Redbud Crabapple is susceptible to fire blight and mildew. [4]
References
  1. Morton Arboretum, Crabapple: A Tree For All Seasons
  2. Redbud Crabapple  Morton Arboretum acc. 105-90* 3,  Photos: Bruce J. Marlin
  3. Morton Arboretum, Crabapples for the Home Landscape
  4. Edward F. Gilman and Dennis G. Watson, USDA,  Fact Sheet ST-403, Malus x zumi 'Calocarpa'
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Family Rosaceae - Rose Family; Fruit Trees
Containing Hawthorns, Apples, Pears, Cherries, Plums, Peach, Almond, Mountain-Ash and Whitebeam. Rosaceae is a large family of plants with about 3,000 species in ~100 genera. Crabapple and other fruit trees provide some of our most outstanding flowering ornamentals, as well as food for birds and other wildlife.
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