Jonagold Apple
Pollination & Compatibility Guide
Jonagold triploid pollination guide. Learn why Jonagold has sterile pollen, requires two diploid partners, and cannot fertilise other apple trees.
Jonagold is a Triploid (Needs 2 Partners)
Jonagold is a triploid: its pollen is sterile, so it cannot fertilise anything — not even the trees planted to pollinate it. It needs TWO compatible pollinizers from bloom group 3–5, which will also pollinate each other.
- Chromosome Ploidy
- triploid
- Required Companions
- 2 Diploid Partners (3-Way)
- Bloom Group
- Group 4 (Mid-Spring)
- Harvest Timing
- Mid (-10d from Golden Delicious)
Flowering Period & Overlap Window
Apple flowering periods are classified into numbered bloom groups (1 through 6). A variety reliably cross-pollinates with cultivars in its own group or adjacent groups (±1 group).
Any compatible diploid apple flowering within Group 3 to 5 provides matching blossom overlap.
Compatible Pollination Partners (73)
| Cultivar | Bloom Group | Overlap Type | Harvest | Primary Uses | Interactive Test |
|---|---|---|---|---|---|
| Group 4 | Full Overlap | Late Concurrent (±0d) | Fresh Eating | Test Cross | |
| Group 4 | Full Overlap | Mid Concurrent (±0d) | Fresh Eating | Test Cross | |
Hawkeye (Original Delicious) | Group 4 | Full Overlap | Mid Concurrent (±0d) | Fresh Eating | Test Cross |
Kandil Sinap | Group 4 | Full Overlap | Late Concurrent (±0d) | Fresh Eating | Test Cross |
| Group 4 | Full Overlap | Mid Concurrent (±0d) | Fresh Eating | Test Cross | |
Melrose | Group 4 | Full Overlap | Late ±10d delta | All-Purpose, Storage | Test Cross |
Tolman Sweet | Group 4 | Full Overlap | Late ±10d delta | Cooking, Cider | Test Cross |
Beni Shogun | Group 4 | Full Overlap | Mid ±15d delta | Fresh Eating | Test Cross |
Snow (Fameuse) | Group 4 | Full Overlap | Mid ±15d delta | Fresh Eating | Test Cross |
Tydeman's Late Orange | Group 4 | Full Overlap | Late ±15d delta | Fresh Eating | Test Cross |
| Group 4 | Full Overlap | Late ±20d delta | All-Purpose | Test Cross | |
Newtown Pippin | Group 4 | Full Overlap | Late ±20d delta | All-Purpose, Storage | Test Cross |
White Winter Pearmain | Group 4 | Full Overlap | Late ±20d delta | All-Purpose, Storage | Test Cross |
| Group 4 | Full Overlap | Late ±20d delta | All-Purpose, Cider | Test Cross | |
York Imperial | Group 4 | Full Overlap | Late ±20d delta | All-Purpose, Storage | Test Cross |
Incompatible Varieties & Exclusions (15)
These varieties overlap in flowering time with Jonagold but cannot fertilise it due to sterile pollen (triploids) or shared genetic incompatibility alleles.
Arkansas Black produces no viable pollen, so it cannot serve as a pollinizer.
Ashmead's Kernel produces no viable pollen, so it cannot serve as a pollinizer.
Baldwin produces no viable pollen, so it cannot serve as a pollinizer.
Belle de Boskoop produces no viable pollen, so it cannot serve as a pollinizer.
Blenheim Orange produces no viable pollen, so it cannot serve as a pollinizer.
Bramley's Seedling produces no viable pollen, so it cannot serve as a pollinizer.
Fall Pippin produces no viable pollen, so it cannot serve as a pollinizer.
A direct parent (Golden Delicious × Jonathan) — roughly half the pollen is non-functional, so it is not a reliable partner.
A direct parent (Golden Delicious × Jonathan) — roughly half the pollen is non-functional, so it is not a reliable partner.
Karmijn de Sonnaville produces no viable pollen, so it cannot serve as a pollinizer.
Mutsu (Crispin) produces no viable pollen, so it cannot serve as a pollinizer.
Orleans Reinette produces no viable pollen, so it cannot serve as a pollinizer.
Spigold produces no viable pollen, so it cannot serve as a pollinizer.
Stayman Winesap produces no viable pollen, so it cannot serve as a pollinizer.
Zabergau Reinette produces no viable pollen, so it cannot serve as a pollinizer.
Grower Commentary: The Triploid Problem in Practice
Jonagold is a vigorous triploid cultivar (resulting from a cross of Golden Delicious × Jonathan). Because triploid apple varieties have three sets of chromosomes, their pollen is genetically malformed and functionally sterile. Jonagold cannot cross-pollinate any other apple variety.
In orchard design, planting Jonagold requires a three-way partnership: Jonagold plus at least two distinct diploid cultivars that flower in the same window (bloom group 3–4) and can cross-pollinate each other (such as Gala and Discovery, or Spartan and Idared). A simple two-variety block of Jonagold + Gala leaves the Gala trees unpollinated and crop-less.
Furthermore, because Jonagold descends from Golden Delicious and Jonathan, it cannot be successfully cross-pollinated by either parent variety due to shared S-incompatibility alleles. Similarly, other triploids like Bramley's Seedling or Mutsu provide zero viable pollen and will not set a crop on Jonagold.
When properly pollinated by two compatible diploids, Jonagold produces high annual yields of large, high-sugar fruit with moderate cold hardiness and reliable vigor on dwarfing rootstocks such as M9.
Key Orchard Considerations for Jonagold
Always plant alongside at least two compatible diploid cultivars so the partner trees can pollinate each other.
Do not rely on Golden Delicious or Jonathan as pollinizers due to shared genetic incompatibility alleles.
Triploid growth is naturally vigorous; manage canopy density through summer pruning to maintain light penetration and fruit color.
Take Jonagold 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 Jonagold 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.