The colder hollow wakes last, but its later blossom can still overlap both partners.
Open the model beside the orchard
This is an authored teaching model in relative units, not horticultural advice. The cultivar names, thresholds, weather histories, and cover effect are fictional. Its value is the causal chain, not calibrated prediction.
1 · Chill unlocks. Each dormant archetype gathers a bell-shaped daily chill credit between −4 and 12 relative degrees.
2 · Heat forces. Only after its chill requirement is met does warmth advance swelling, budbreak, bloom, petal fall, and fruit.
3 · Stage changes risk. Dormant wood ignores model frost; open blossom is damaged below −1.2 relative degrees.
4 · Flowers need company. Fruit potential needs bloom overlap with another archetype and a warm, dry, low-wind pollinator window.
Named microclimate terms: the frost hollow shifts night minimum −1.6° and day maximum −0.25°; the open row shifts neither; the sun wall shifts night minimum +0.9° and day maximum +0.65°. The movable cover adds +2.35° only to the selected row’s night minimum from February onward.
Authored archetypes: Emberglass needs 38 chill units / 92 forcing units; Vale Gold 48 / 76; Cloudcup 58 / 61. Their opposing requirements make synchronized bloom possible after a steady winter and fragile after a mild one.