Dunstan Citrus
A useful Poncirus and grapefruit hybrid that has frequently been utilized as rootstock but also makes an excellent cold hardy citrus shrub in our climate. Fruits are larger than typical Poncirus fruits, and maybe a bit sweeter, but are best used for juices, marmalades, baked goods, or cocktails! Reliably hardy to at least 10 degrees Fahrenheit, and likely a good bit lower once established.
Click here to view our Citrus Growing Guide.
Latin Name: Poncirus trifoliata x Citrus paradisi
Site and Soil: In spring, summer and fall, keep your potted Citrus in a location with 1/2 day to full sun. In the winter, place your plant in a well-lit room. Potting soil should be coarse, acidic, and well-drained.
Rootstock Description: Self-rooted
Pollination Requirements: Self-fertile. You can help it set fruit by taking a small brush and moving pollen from flower to flower.
Hardiness: So far they’ve been hardy here in Zone 8b, we’re hoping down to 10° F.
Bearing Age: 1-2 years after planting
Size at Maturity: 6-8 ft.
Taste: Sugary sweet flavor balanced with acid/bitterness
Fruit Skin: Yellowish-orange, green
Fruit Flesh: Yellowish-orange
Bloom Time: Winter and spring
Ripening Time: Fall into winter
Yield: 20+ fruit
Care: Fertilize with citrus mix 3-4 times per year with typical applications in late winter (Jan-Feb), late spring (May-June) and early fall (Sept-Oct).
Pests & Diseases: While outside, Citrus plants will likely not be bothered by insect pests. Be on the lookout for slugs. Indoors, Citrus can have mites and/or aphids. Watch carefully for any problems and treat with an insecticidal soap or wash them off. We have not seen any disease problems on our Citrus plants.
USDA Zone: 8b