Olive tree care in zone 8-10
*Olea europaea* -- the olive -- is one of the oldest cultivated trees in the world, with a production history stretching back at least 6,000 years in the Mediterranean basin. In North America, it is grown primarily in California, the Southwest, and the Gulf Coast. Where it is reliably hardy (zones.
—- title: "Olive tree care in zone 8-10" slug: olive-tree-care hub: plants category: "Fruit tree guide" description: "How to grow olive trees (Olea europaea) in zones 8-10, including variety selection for different climates, care in containers for colder zones, and processing olives at home." date: 2026-06-10 updated: 2026-06-10 author: "Thomas A." reading_time: 9 scientific: "Olea europaea" zones_min: 8 zones_max: 11 sun: "full sun" —-
Olea europaea — the olive — is one of the oldest cultivated trees in the world, with a production history stretching back at least 6,000 years in the Mediterranean basin. In North America, it is grown primarily in California, the Southwest, and the Gulf Coast. Where it is reliably hardy (zones 8b-11), it requires almost no spraying, tolerates drought once established, and is exceptionally long-lived. Trees in the Mediterranean are known to be hundreds of years old.
I don't grow olive at my zone 7a Long Island site — it would not survive an average Long Island winter outdoors. This guide is sourced from UC Cooperative Extension and Texas A&M AgriLife.
USDA hardiness zones
Per UC Cooperative Extension, Olea europaea is reliably hardy in zones 8b-11. Established trees can withstand temperatures to 15-17°F (-9 to -8°C) for brief periods; prolonged cold below 20°F kills most trees. Young trees are less cold-tolerant than established specimens.
In zone 8a (temperatures occasionally to 10-15°F), survival is uncertain. A sheltered, south-facing microclimate can make zone 8a workable, but it is not reliable.
Variety selection
Table olives (primarily for eating):
- 'Manzanilla': The most common table olive in California; medium fruit; prolific; zones 9-11
- 'Mission': Large fruit; good flavor; one of the oldest California varieties; zones 9-11
- 'Sevillano': Very large fruit; mild flavor; zones 9-11
Oil olives:
- 'Arbequina': Small tree; cold-hardy (to approximately 15°F); zones 8-10; excellent oil quality
- 'Picual': Common Spanish oil variety; zones 9-11
- 'Koroneiki': Greek variety; small fruit; high oil content; zones 9-11
Pollen-free/fruitless varieties:
- 'Swan Hill': Essentially fruitless; no pollen; grown as ornamental; zones 8-11
- 'Majestic Beauty': Low pollen; semi-fruitless
Per Texas A&M AgriLife Extension, 'Arbequina' is increasingly recommended for zones 8-9 in the South and Southwest due to its relative cold-hardiness and compact size.
Light requirements
Per UC Cooperative Extension, olives require full sun — 8 hours minimum. Flowering and fruit set are dramatically reduced in partial shade. Olives grown in full sun with reflected heat from masonry produce the most fruit and oil.
Planting
Per Texas A&M AgriLife Extension, plant container-grown olives in spring. Space standard trees 20-25 feet apart; 'Arbequina' and other compact varieties 10-15 feet. Olive adapts to a wide range of soils but requires sharply-drained conditions — it will not tolerate standing water.
Olives are particularly salt-tolerant and perform well in coastal locations within their zone range, per UC Cooperative Extension.
Watering
Per UC Cooperative Extension, olive is one of the most drought-tolerant fruit trees in cultivation. Established trees in zones 9-10 with 15-20 inches of annual rainfall typically need no supplemental irrigation. Young trees need 1 inch per week through the first growing season.
In very dry climates (less than 10 inches annual rainfall), irrigate established trees monthly through summer. Over-irrigation promotes excessive vegetative growth and reduces oil content in the fruit.
Soil requirements
Per Texas A&M AgriLife Extension, olive grows best in:
- Well-drained, alkaline to slightly acid soil; pH 6.0-8.5
- Rocky, gravelly, or sandy soils are acceptable and common in its native range
- Poor drainage is the most significant planting failure — olive on wet soils develops Verticillium wilt and root rot rapidly
Raised beds with gravel incorporation are recommended in any clay soil.
Fertilizing
Per UC Cooperative Extension, olive trees in most soils need minimal fertilization. A single spring application of balanced fertilizer at half the label rate provides adequate nutrition. Nitrogen deficiency (pale, yellowing leaves; poor growth) is addressed with a half-pound of actual nitrogen per mature tree annually.
Do not over-fertilize. High nitrogen produces suculent vegetative growth that delays flowering and reduces fruit production.
Pruning
Per UC Cooperative Extension, olives are pruned to:
- Maintain manageable tree height for harvest
- Open the canopy to light (olives fruit on one-year-old wood; all wood needs light)
- Remove vigorous upright "watersprout" growth
- Remove deadwood
Prune in late winter-early spring, before new growth begins. Olives tolerate heavy pruning and can be cut back severely if they have become too large. They regenerate vigorously from old wood.
Alternate bearing: Olives, like many fruit trees, are prone to alternate bearing — heavy fruit production one year, little the next. Per UC, crop thinning in heavy years (removing 50% of fruit by cluster thinning) can moderate the alternation. Some growers accept the biennial pattern.
Pollination
Per UC Cooperative Extension, most olive varieties are at least partially self-fruitful. Fruit set is improved with cross-pollination from a different variety; plant two or more cultivars within 50-100 feet for best production. Wind is the pollination vector — olive pollen is abundant and airborne, causing significant allergenic reactions in sensitive individuals.
Processing olives
Per UC Cooperative Extension, raw fresh olives are inedible due to bitter oleuropein compounds. All olives must be cured before eating:
Brine-curing: Submerge olives in 8-10% salt brine; change brine weekly; cure for 6-12 months. Traditional method; produces complex flavor.
Lye-curing: Soak in 2-3% sodium hydroxide solution for 12-24 hours to remove bitterness; rinse; brine-cure for 2-4 weeks. Produces milder, California-style cured olives.
Dry-salting: Pack in coarse salt; cure for 6-8 weeks. Produces wrinkled, intensely flavored olives.
Pests and diseases
Per UC IPM:
**Olive fruit fly (Bactrocera oleae):** The most serious pest in California. Larvae develop in olive fruit. Trap monitoring; spinosad or kaolin clay-based sprays per label during egg-laying period.
Verticillium wilt: Soilborne fungus; wilt and branch dieback. No cure once established; improve drainage; avoid planting where related plants have had verticillium.
**Olive knot (Pseudomonas savastanoi):** Bacterial galls on branches. Remove infected wood; copper sprays at pruning; avoid pruning in wet weather.
Common problems
| Symptom | Likely cause | Fix |
|---|---|---|
| No fruit set | Self-infertile variety; no pollinator; insufficient heat | Plant second variety; ensure 8+ sun hours |
| Bitter, inedible fruit | Uncured olives (normal) | Process olives; all fresh olives require curing |
| Wilting branches; rapid decline | Verticillium wilt or root rot | Improve drainage; no chemical cure |
| Olive fly-infested fruit | Bactrocera oleae | Kaolin clay; spinosad; trap monitoring |
| Heavy one year, nothing next | Alternate bearing | Normal; thin crop in heavy years |
Frequently asked questions
Can I grow olive in zone 7? Per UC Cooperative Extension, zone 7 (temperatures occasionally to 0-10°F) is too cold for reliable outdoor olive culture. 'Arbequina' has survived occasional zone 7b temperatures, but this is the exception. Container culture with winter protection is possible and practiced by some enthusiasts — bring indoors when temperatures drop below 20°F.
How long before an olive tree produces fruit? Per Texas A&M AgriLife Extension, container-grown olive transplants typically produce first fruit in year 3-5. Full production takes 5-8 years. Once established, olive trees are productive for decades — in favorable climates, for well over a century.
Do olive trees need cold to produce fruit? Per UC Cooperative Extension, yes. Olives require a period of cool temperatures (below 50°F for several weeks) in winter to initiate flowering the following spring. This is why olive does not fruit reliably in tropical zones 10b-11 in South Florida, even though the tree survives. Zone 8b-10 with defined winter seasons is the production sweet spot.
Is olive pollen really a serious allergen? Per UC Cooperative Extension, olive pollen is among the most prevalent and potent allergenic pollens in regions where the tree is widely planted. In California cities with heavy olive plantings, seasonal olive pollen counts are a significant public health issue. The pollen-free 'Swan Hill' and similar varieties were developed specifically to address this concern and are recommended for urban landscapes.
Sources
- UC Cooperative Extension — Olive production and care
- Texas A&M AgriLife Extension — Olive trees in Texas
- UC IPM — Olive fruit fly