× Citroncirus 'C-35' (C-35 Citrange Rootstock)
× Citroncirus 'C-35'
Contents
Introduction & History
C-35 Citrange is the Goldilocks rootstock — not too big, not too small, but just right for the modern trend toward compact, manageable citrus trees in both commercial orchards and home gardens. Developed at the USDA Citrus Research Station in Riverside, California, C-35 is a citrange (citrus × trifoliate hybrid) selected specifically for its semi-dwarfing effect: trees grafted on C-35 reach approximately 60–80% of the size they would on standard Carrizo rootstock. This moderate size reduction, combined with Carrizo-level disease resistance and excellent fruit quality, has made C-35 increasingly popular for high-density planting systems, large containers, and smaller home gardens where a full-sized citrus tree would overwhelm the space.
History & Origin
C-35 was selected from a citrange breeding population at USDA Riverside, identified for its semi-dwarfing influence on grafted citrus while maintaining the disease resistance of standard citranges. The name 'C-35' is the selection number from the breeding program. It gained popularity in the 2000s as the citrus industry shifted toward high-density planting and as home gardeners sought manageable-sized citrus trees.
Botanical Description
Similar to Carrizo but with a more compact growth habit: reaches 4–6 m ungrafted. Unifoliate leaves with winged petioles. Moderate thorns. Semi-deciduous in cold climates. The semi-dwarfing effect on grafted trees is the primary distinguishing characteristic. Trees on C-35 are visibly more compact than those on Carrizo.
Planting & Cultivation
Used as rootstock. Especially recommended for: home gardens with limited space, large containers (60–100 L), high-density commercial plantings. Trees on C-35 can be planted 3–4 m apart vs. 5–6 m for Carrizo. The semi-dwarfing effect makes C-35 rootstock citrus the best choice for gardeners wanting disease-resistant trees that don't outgrow their space.
Cultivation
Provides 60–80% of standard tree size with equivalent fruit quality. Disease resistance comparable to Carrizo. Good Phytophthora resistance. Tristeza tolerant. The smaller tree size means easier harvesting, less pruning, and more fruit per unit area in commercial settings. Fruit quality is often excellent — brix levels may be slightly higher than on more vigorous rootstocks.
Climate & Cold Protection
Cold-hardy to approximately -8°C. USDA zones 8–11. Slightly less cold-hardy than Carrizo but more than adequate for most citrus-growing regions.
Seasonal Care
Standard citrus care following the scion variety. The semi-dwarfing effect means less pruning than Carrizo-rootstocked trees. Remove rootstock suckers.
Cold Protection
Hardy to -8°C. Scion variety determines protection needs.
Seasonal Care Calendar
🌱 Spring (Mar–May)
Water: Heavy
Feeding: Heavy feeding
Remove rootstock suckers; standard scion care
☀️ Summer (Jun–Aug)
Water: Very Heavy
Feeding: Heavy feeding
Semi-dwarfing means less pruning needed than Carrizo
🍂 Autumn (Sep–Nov)
Water: Regular
Feeding: Regular feeding
Monitor graft; the compact tree settles into space well
❄️ Winter (Dec–Feb)
Water: Light
Feeding: Light feeding
Good cold protection; semi-compact trees easy to cover if needed
Propagation
Polyembryonic seeds, grown in certified nurseries. Budded with commercial varieties. Availability increasing as demand for semi-dwarfing rootstock grows.
Diseases & Pests
Similar to Carrizo: tristeza resistant, Phytophthora resistant, nematode resistant. Good overall disease resistance profile. Susceptible to exocortis viroid.
Harvesting & Culinary Uses
Not applicable — rootstock only.
Culinary Uses
None — rootstock only.
Rootstock Guide
Semi-dwarfing rootstock producing trees 60–80% of standard size. The best compromise between Carrizo (full size) and Flying Dragon (50–70% dwarf). Advantages: disease resistance, semi-compact trees, good fruit quality, easier harvesting. Recommended for: home gardens, high-density orchards, large containers. The increasingly popular choice for modern citrus planting.
Container & Companion Growing
Container Growing
Better than Carrizo for containers. Trees on C-35 rootstock can be maintained in 60–100 L containers for years. The semi-dwarfing effect keeps trees manageable. For smaller containers (30–50 L), Flying Dragon remains the better choice.
Companion Planting
Not applicable — rootstock only.
Common Mistakes to Avoid
Expecting full dwarfing like Flying Dragon — C-35 is semi-dwarfing, so trees are still substantial (3–5 m). Choosing C-35 for small containers where Flying Dragon is more appropriate. Not accounting for the moderately vigorous trees that still need some space.
Frequently Asked Questions
How much smaller are trees on C-35 vs. Carrizo?
Approximately 60–80% of Carrizo size. A Valencia orange that reaches 6 m on Carrizo would reach approximately 4–5 m on C-35. The reduction is moderate but significant for space-limited gardens. Trees are compact enough for closer spacing but still large enough for good production.
Is C-35 better than Flying Dragon for home gardens?
Depends on garden size and goals. C-35 produces medium-sized trees (3–5 m) with standard production levels — ideal for gardens with reasonable space. Flying Dragon produces very compact trees (2–3 m) better for containers and very small gardens, but with somewhat reduced yields. C-35 is the 'medium' option between full-size Carrizo and miniature Flying Dragon.
Does C-35 affect fruit quality?
Fruit quality on C-35 is generally excellent — often equal or slightly superior to Carrizo. The semi-dwarfing effect concentrates the tree's energy into fewer but potentially higher-quality fruit. Brix levels may be slightly elevated. No negative fruit quality effects have been documented.
Is C-35 widely available?
Increasingly so. Specialty citrus nurseries in California and Florida now stock C-35-rootstocked trees. It's not yet as universally available as Carrizo, but demand is growing rapidly as gardeners and orchardists recognize its advantages. Ask your nursery specifically for C-35 rootstock when purchasing citrus for limited-space gardens.
Can I use C-35 for container citrus?
Yes — it works well in large containers (60–100 L) for medium-term culture (5–10 years). Trees stay smaller than on Carrizo but eventually outgrow very small pots. For long-term container culture in smaller pots (30–50 L), Flying Dragon remains the better choice. C-35 is ideal for large patio containers where you want a productive, manageable tree.
C-35 Citrange is the semi-dwarfing citrus rootstock — producing trees 60-80% of standard size with Carrizo-level disease resistance and excellent fruit quality. Developed at USDA Riverside, it fills the gap between full-sized Carrizo and strongly dwarfing Flying Dragon. Ideal for home gardens, high-density orchards, and large containers, C-35 is the increasingly popular 'Goldilocks' rootstock for modern citrus planting where space is a consideration.
Quick Reference: × Citroncirus 'C-35'
Key Principles: Full sun, excellent drainage, regular feeding during growth, frost protection in marginal zones, and proper rootstock selection for your climate.