Sentinel Crabapple - Malus 'Sentinel'
Sentinel crab has an outstanding, upright vase shape, "upstanding like a sentinel."
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Sentinel Crabs covered in blooms, May 4th, near Chicago

Opening from pink buds, Sentinel crabapple's snow-white flowers are a spring highlight. The tree's lovely, upright vase-shaped crown make this an outstanding ornamental for smaller spaces. Sentinel is susceptible to fire blight and apple-scab but good resitence to rust and powdery mildew [3].

There are about 55 different species in the genus Malus, and there are innumerable cultivars available in the landscape trade. The Arboretum's Crabapple Collection was started in 1924. Part of this collection on the West Side participated in the National Crabapple Evaluation Program which evaluated new and disease-resistant varieties. As a result of the multi-year evaluation and additions, it has transformed into the West Side Malus collection which now contains 60 different kinds and over 140 specimens with highly desirable qualities. 

Some of the specimens in this collection are almost large enough to be considered shade trees, while others are quite small. There is a great variety of shape as well, from wide to upright and narrow, weeping, and multi-stemmed. There is variety in flower color, ranging from white to pink, red, purple, and crimson. Some flower buds will be one color, and then open up to a completely different color! Fruits range in size from smaller than a pea, to nearly the size of most apples; they can be red, purple, orange, yellow, or green. Some of the smaller fruits persist on the tree throughout winter, providing a splash of color in the cold months. [1]

Crabapples thrive in full sun and grow best in well drained, slightly acidic soils (pH 5.5-6.5); however, they will grow well in many soil types. Most crabapple selections tolerate the cold winters and hot, dry summers prevalent in the Midwest.

For many years, crabapple cultivars have been selected on the basis of their flowers, but with some cultivars, undesirable features, such as disease problems and early fruit drop, outweigh their short-lived spring beauty. No single cultivar can fulfill every landscaping need.  [3]

Sentinel Crabapple Trio - Malus 'Sentinel' , Morton Arboretum acc. 45-84*1, 2 & 3 from plantings, are 25 years old [2]
References
  1. Morton Arboretum, Crabapple: A Tree For All Seasons
  2. Sentinel Crabapple - Malus 'Sentinel', Morton Arboretum acc. 45-84*1, 2 & 3, Photos © Bruce Marlin
  3. Morton Arboretum, Crabapples for the Home Landscape
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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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