North Star Dwarf Sour Cherry
Pollination & Compatibility Guide
North Star cherry pollination guide: naturally dwarf self-fertile sour cherry, extreme cold hardiness (-40°F), solitary cropping, and care.
North Star is Self-Fertile (Sets Full Crop Alone)
North Star will set a crop planted on its own. A nearby partner can still lift fruit set.
- S-Genotype / Genetics
- Self-Fertile (Sour)
- Required Companions
- 0 (Self-Fertile)
- Bloom Group
- Group 2 (Early-Spring)
- Harvest Timing
- Mid Season
Flowering Period & Overlap Window
Sweet and sour cherry flowering periods are classified into numbered bloom groups (1 through 5). Cross-pollination requires overlapping bloom timing between genetically compatible cultivars.
Any compatible cherry cultivar flowering within Group 1 to 3 provides matching blossom overlap.
Compatible Pollination Partners (4)
| Cultivar | Bloom Group | Overlap Type | Harvest | Primary Uses | Interactive Test |
|---|---|---|---|---|---|
| Group 2 | Full Overlap | Mid | Cooking, Pie, Preserves | Test Cross | |
| Group 3 | Full Overlap | Late | Juicing, Pie | Test Cross | |
| Group 3 | Full Overlap | Mid | Cooking, Juicing | Test Cross | |
| Group 3 | Full Overlap | Late | Cooking, Juicing | Test Cross |
North Star Dwarf Sour Cherry: Hardiness & Self-Fertility
North Star is a celebrated naturally dwarfing sour cherry bred at the University of Minnesota (English Morello × Serbian Pie Cherry, introduced 1950). Reaching a mature height of only 8 to 10 feet on standard rootstocks, North Star produces heavy annual crops of dark mahogany fruit with rich red juice and full Morello-type tart flavour.
North Star is fully self-fertile and sets heavy, dependable crops as a standalone tree with zero cross-pollinators required. It is also an effective pollen donor for other sour cherry cultivars flowering during its bloom window, providing excellent pollination support across the fruit planting.
Flowering late in Bloom Group 4, North Star escapes late spring frosts. Combined with extreme winter wood hardiness down to USDA Zone 4 (-40°F / -40°C), it is the premier sour cherry for northern and high-elevation fruit growers seeking manageable tree size and consistent production year after year.
Its naturally compact canopy simplifies pest management, pruning, and bird netting without requiring dwarf rootstock combinations.
Key Orchard Considerations for North Star
Grows naturally as a compact, manageable 8–10 ft tree without dwarfing rootstocks, making it ideal for high-density backyard orchards and small spaces.
Demonstrates exceptional cold hardiness into Zone 4, surviving deep mid-winter freezes that damage or kill standard sweet and European cherry wood.
Produces dark, richly coloured juice and firm tart flesh ideal for home canning, preserves, pies, and artisan sour cherry reduction sauces.
Take North Star from Planning to Planting
Use Kropigo's free browser tools to model your block density, tree counts, and pollinizer rows, then maintain permanent orchard records row by row.
Pollination Checker
Check North Star against supported cultivars with compatible flowering and pollination data.
Commercial Block Planner
Calculate high-density tree spacing, row geometry, and establishment costs.
Block Record Keeping
Track pruning, chemical thinning, and harvest tallies block by block from the orchard.