Acer platanoides Crimson Sentry™
Crimson Sentry Norway Maple
Native to (or naturalized in) Oregon:
- Broadleaf deciduous tree, compact, narrow, to about 25 ft tall and 15 ft wide (7.5 × 4.5 m), very dense, initially columnar, later pyramidal to oval. Leaves opposite, simple, purple-maroon; reddish bronze in fall.
- Sun. Slow growing. In western Oregon the trees appear rather susceptible to powdery mildew, a fungal disease. This is especially noticeable in mid- to late-summer. The affected leaves become a dull maroon color followed by a white-gray color, as if dusted with powdered sugar. One authority suggested that Crimson Sentry™ should not be recommended for mass or street plantings "unless a ghostly pallor on purple foliage is actually wanted". Possibly by opening the tree's canopy (pruning) and/or selecting a planting site with good air movement will lessen the disease.
- Hardy to USDA Zone 4 From a bud sport of 'Crimson King" in 1970 in the A. McGill & Son nursery, Fairview (now near Hubbard), Oregon. Plant Patent, PP03258, awarded in 1972.