Coralburst Crabapple

Malus 'Coralburst' (Rosaceae) is a compact deciduous crabapple cultivar, typically grafted onto a standard to form a small, rounded tree. Double coral-pink flowers appear in profusion in spring. Small persistent fruit follows.

Coralburst performs best in full sun on well-drained soil. Bloom begins around 217 GDD (base 50 F) with full bloom near 263 GDD, making it one of the earlier-blooming crabapple cultivars. Its compact size suits smaller garden spaces and street tree plantings.

Coralburst® is a useful semi-dwarf crabapple for tight Puget Sound residential spaces — under utility lines, between sidewalk and house, in courtyards and entry alcoves. The top-graft lollipop form gives a clean, formal appearance that fits well in urban hardscapes where a multi-stem natural-form crabapple would look unkempt. The 15 × 15 ft mature size is genuinely compact: this is one of the only crabapples that stays small enough for sidewalk planting strips. Disease performance is the major regional caveat: while fire blight, rust, and mildew resistance are excellent, the moderate scab susceptibility (rated MS here based on JFS Fair and conservative PA/IL regional trials) is a real concern in maritime PNW where cool wet springs produce heavy scab pressure most years. Expect some defoliation in scab-heavy years; foliage already tends to look dull by midsummer per Johnson's Nursery observations. If scab tolerance is a priority, 'Adirondack' or 'Prairifire' are better choices for the region. Where the compact form is required and moderate scab is acceptable, Coralburst® remains a defensible pick. The octaploid heritage produces semi-double flowers that read more like a mid-spring flowering cherry than a typical single-flowered crabapple — a distinct ornamental character worth noting when selecting for visual effect. Alternate-year bearing means flower density varies dramatically between seasons; plan companion plantings accordingly.

— Chris Welch, ISA Certified Arborist