Rainier Sweet Cherry
Pollination & Compatibility Guide
Rainier cherry pollination guide: S-genotype (S1S4, Group IX), compatible pollinizers (Bing, Van, Lapins), bloom overlap, and orchard management.
Rainier is Self-Incompatible (Needs 1 Partner)
Rainier needs at least one compatible pollinizer from bloom group 2–4 to set a reliable crop.
- S-Genotype / Genetics
- S1S4 (Group IX)
- Required Companions
- 1 Compatible Partner
- Bloom Group
- Group 3 (Mid-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 2 to 4 provides matching blossom overlap.
Compatible Pollination Partners (20)
| Cultivar | Bloom Group | Overlap Type | Harvest | Primary Uses | Interactive Test |
|---|---|---|---|---|---|
| Group 3 | Adjacent Overlap | Mid-Late | Fresh Eating, Canning | Test Cross | |
| Group 3 | Adjacent Overlap | Mid | Canning, Fresh Eating | Test Cross | |
| Group 3 | Adjacent Overlap | Mid | Fresh Eating | Test Cross | |
| Group 3 | Adjacent Overlap | Mid | Fresh Eating | Test Cross | |
| Group 3 | Adjacent Overlap | Mid | Fresh Eating | Test Cross | |
SelahGuideUniversal Donor | Group 3 | Full Overlap | Mid | Fresh Eating | Test Cross |
StellaGuideUniversal Donor | Group 3 | Full Overlap | Mid | Fresh Eating, All-Purpose | Test Cross |
SunburstGuideUniversal Donor | Group 3 | Full Overlap | Mid | Fresh Eating | Test Cross |
| Group 3 | Adjacent Overlap | Mid | Fresh Eating | Test Cross | |
| Group 3 | Adjacent Overlap | Mid | Fresh Eating, Canning | Test Cross | |
Attika | Group 4 | Full Overlap | Late | Fresh Eating | Test Cross |
| Group 2 | Adjacent Overlap | Early | Fresh Eating | Test Cross | |
| Group 2 | Adjacent Overlap | Early | Fresh Eating | Test Cross | |
| Group 2 | Full Overlap | Early | Fresh Eating | Test Cross | |
| Group 2 | Adjacent Overlap | Early-Mid | Fresh Eating | Test Cross |
Incompatible Varieties & Exclusions (3)
These cherry varieties overlap in flowering time with Rainier but cannot fertilise it due to shared S-allele genetic incompatibility groups.
Utah Giant's S-genotype is not recorded. For this crop compatibility is computed from S-alleles, so it cannot be offered as a partner without one.
Vibrant's S-genotype is not recorded. For this crop compatibility is computed from S-alleles, so it cannot be offered as a partner without one.
Vindskörsbär (Victor)'s S-genotype is not recorded. For this crop compatibility is computed from S-alleles, so it cannot be offered as a partner without one.
Rainier Orchard Management & Pollination Strategy
Rainier is the global standard for premium white-fleshed sweet cherries, distinguished by its golden-yellow skin, vibrant red blush, and exceptionally high brix. Developed at Washington State University (Bing × Van), Rainier commands elite fresh-market returns but presents exacting horticultural and pollination requirements. Trees are vigorous, upright-spreading, and heavy croppers when adequately cross-pollinated.
Genetically, Rainier carries the S1S4 genotype, placing it in Incompatibility Group IX. It is gametophytically self-incompatible and cannot set fruit with its own pollen or with other Group IX cultivars. While Bing (S3S4) and Van (S1S3) are its historical parents, they share only one S-allele each with Rainier, making them fully compatible reciprocal pollen donors that provide matching mid-season bloom overlap.
For maximum fruit set and yield security, plant Rainier alongside self-fertile universal donors like Lapins (S1S4′) or Sweetheart (S3S4′). Rainier flowers profusely in Bloom Group 3; establishing two distinct compatible pollinizers within 30 to 50 feet ensures optimal bee transfer during cool or unsettled spring pollination windows.
Key Orchard Considerations for Rainier
Rainier's clear, delicate yellow skin shows wind rub and harvest fingerprinting immediately. Establish robust windbreaks and train trees with wide branch angles to minimize limb contact.
High sugar levels make mature fruit vulnerable to cuticle splitting from rain near harvest. Employ high tunnels, automated rain covers, or post-rain helicopter drying to safeguard packouts.
The striking colour transition and high sugar content attract birds before commercial maturity. Install comprehensive canopy netting prior to yellow ground-colour change.
Take Rainier 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 Rainier 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.