Click here for Sweet Cherry Care Guide Prunus avium - Ulster Due to import restrictions we are unable to ship Cherries to CA, Europe... Prunus avium ‘Ulster’ – Ulster Sweet Cherry A late-ripening sweet cherry known for large, firm fruit and excellent crack resistance. Fruit is dark red with sweet, rich flavor and firm flesh, making it excellent for fresh eating and shipping. Trees are vigorous, productive, and bloom later than many sweet cherries, helping avoid some spring frost damage. Ulster is a dependable pollinator for other sweet cherries and needs another sweet cherry variety nearby for cross pollination. Requires well-drained soil and full sun for best production. Ripens late season. Zone 5–7. Approx. 700–800 chill hours. Height 15–20'. Space 15–20'. Plant Characteristics Pollination: Requires Pollinator Pest Resistance: Average Disease Resistance: Poor Drought Tolerance: Moderate Heat Tolerance: Good Humidity Tolerance: Moderate Sun Tolerance: Excellent Wet Soil Tolerance: Poor Shade Tolerance: Poor No Spray: Poor to Fair Salt Tolerance: Poor Thorns: No Plant Type: Tree Soil Type: Well-drained Edible Type: Fruit Self Fertile: No