Hass Avocado

The world's most popular avocado variety, accounting for 80 percent of global production, with pebbly dark skin that turns nearly black when ripe. Hass avocados have a rich, buttery flavor and high oil content that makes them the gold standard for guacamole. The trees are A-type flowers and benefit from a B-type pollinator such as Fuerte or Bacon nearby.

While Hass avocado seeds can be sprouted using the toothpick-in-water method, seedlings will not produce true Hass fruit. Trees grown from Hass seeds take eight to fifteen years to fruit and produce variable, often inferior fruit. For true Hass avocados, purchase grafted nursery trees. Hass seedlings can be used as rootstock, but commercial growers prefer Zutano or Duke 7 rootstock for disease resistance. Propagation by grafting is the only way to reproduce the Hass variety.

The Season Plate

Your Hass Avocado Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Plant Hass Avocado Mar – May, pick Feb – Sep. Check the planting methods below and set your climate to personalize these windows.

Planting windows

Mar – May

Plant · Mar – May

Outdoor planting

after Apr 2

once frost risk has passed

First picking

around Feb 28

≈ 1460 days from this planting · 200-500 fruit per plant

Composed for —ColdTemperateMildWarmNorthSouthUse my locationUsed once to set your season · only the zone is kept

Week-by-week Hass Avocado reminders watering, feeding and pruning, timed to your dates

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Frost alerts for your garden a warning before a cold night costs you the crop

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Follow-up planting dates plan the next planting for the season

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Get my Hass Avocado datesSaved to your free garden plan · no card needed

Hass avocado grows best in coastal Mediterranean and subtropical climates with mild winters. The tree reaches twenty-five to thirty-five feet tall with a spreading canopy. Plant in full sun with excellent drainage, as Hass is particularly susceptible to root rot in wet soils. Space trees at least twenty to twenty-five feet apart. Water deeply but infrequently, allowing the top few inches of soil to dry between irrigations.

Hass is a Guatemalan-type avocado and is more cold-sensitive than Mexican-type varieties, suffering damage below 30 degrees Fahrenheit. Protect young trees from frost with covers during cold events. Fertilize four times per year with a citrus and avocado fertilizer that includes zinc, iron, and manganese. The tree is an alternate bearer, producing a heavy crop one year followed by a lighter crop the next.

Hass is a Type A flowering variety, which means it benefits greatly from having a Type B pollinator such as Fuerte, Bacon, or Zutano planted nearby. Without cross-pollination, fruit set can be poor. Prune minimally, focusing on removing dead wood and maintaining a manageable canopy height. Hass avocados remain on the tree for months after maturity, so harvest can be spread over a long window from spring through fall.

Plant a B-type pollinator such as Fuerte, Bacon, or Zutano within fifty feet of Hass trees for improved fruit set. Basil and lavender attract pollinators and grow well nearby. Low-growing cover crops like white clover suppress weeds without competing with the shallow root system. Avoid planting turf grass up to the trunk. Comfrey, yarrow, and borage planted at the drip line attract beneficial insects and provide mulch material when cut.

The Society Table

Basil belongs beside it.

Old growers' knowledge, checked against Hass Avocado's real companion table below — test any plant you're growing.

Grows well in the company of · 2

BasilLavender

Keep apart · 0

no recorded foes

Plant Hass Avocado with good neighboursThe planner flags conflicts before they're in the ground

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Hass avocado requires exceptionally well-draining soil, ideally sandy loam with a pH of 6.0 to 6.5. It is more sensitive to root rot than many other avocado varieties. Apply a complete avocado fertilizer four times per year with supplemental zinc. Avoid chloride-containing fertilizers, as avocados are salt-sensitive. Organic mulch extending to the drip line is essential but must never touch the trunk. Iron chlorosis occurs in alkaline soils and requires chelated iron treatment.

Ideal Temperature

Hardiness Zone Compatibility

Hass avocados are ready to harvest when the skin color changes from green to dark purplish-black, though this color change is gradual. The most reliable test is to pick one fruit and see if it ripens properly at room temperature within seven to ten days. Fruit can remain on the tree for many months after maturity, storing naturally until needed. Cut the stem with clippers rather than pulling. Leave a small stem stub attached to reduce decay.

Storage & Preservation

Firm Hass avocados ripen at room temperature in five to seven days. Speed ripening by placing in a paper bag with an ethylene-producing fruit. Once the fruit yields to gentle pressure, it is ready to eat. Ripe fruit stores in the refrigerator for two to three days. Mashed flesh mixed with lemon juice freezes well for up to four months. Avocado oil extracted from the flesh has an extended shelf life and is a premium cooking and finishing oil.

Phytophthora Root Rot

Disease

Small, pale, wilted leaves, branch dieback from the tips, dark mushy roots, overall tree decline.

Prevention Plant only in well-draining soil. Use tolerant rootstock like Dusa. Avoid overwatering and improve drainage.

Fix: Apply phosphonate fungicides as a foliar spray or trunk paint. Reduce irrigation and improve soil drainage with gypsum applications.

Avocado Thrips

Pest

Scarring and roughening of fruit skin, brown leathery patches on young fruit, cosmetic damage that reduces market value.

Prevention Monitor for thrips on new growth in spring. Maintain balanced fertilization to avoid soft, attractive new growth flushes.

Fix: Apply spinosad or abamectin sprays during bloom and early fruit set when thrips populations are highest.

Laurel Wilt

Disease

Rapid wilting and browning of foliage, dark streaking in the sapwood, tree death within weeks of symptom onset.

Prevention Prevent ambrosia beetle attacks by keeping trees healthy. Remove and destroy dead wood. Monitor for beetle activity.

Fix: No cure exists once symptoms appear. Infected trees should be removed and destroyed immediately to prevent spread to nearby trees via beetle vectors.

Troubleshooting Common Problems

Alternate bearing is the most common frustration, with heavy and light crop years alternating regardless of care. Tip burn on leaf margins indicates salt damage from water or fertilizer. Hass is less cold-tolerant than many avocado varieties and suffers fruit and flower damage below 30 degrees Fahrenheit. The tree produces abundant fruit that naturally drops before maturity; this is normal and not a sign of problems. Sunburn on exposed fruit causes brown, leathery patches.

Growing Tips

1. Always plant grafted Hass avocado trees rather than seed-grown specimens. Grafted trees begin fruiting in 3-4 years compared to 8-15 years for seed-grown trees, and they reliably produce fruit identical to the parent Hass variety. Seed-grown trees produce unknown, often inferior fruit and are not a practical choice for the home garden.
2. Plant a Type B avocado pollinator variety such as Bacon, Fuerte, Zutano, or Ettinger within 5-10 meters of your Hass tree. Hass is a Type A variety and pairs best with Type B for optimal fruit set. While Hass trees will produce some fruit without a pollinator, yields are dramatically higher when a compatible variety is nearby and in simultaneous bloom.
3. Avocado roots are extremely sensitive to waterlogging and Phytophthora cinnamomi root rot, the most serious disease threat to avocado worldwide. Always plant on a gentle slope, in a raised bed, or mound the soil at the planting site to ensure the root crown sits at least 20-30 cm above the winter water table. Never plant in a low-lying area that collects water.
4. Maintain a thick, coarse organic mulch layer extending from 30 cm away from the trunk out to the drip line and beyond. Avocado feeder roots are mostly in the top 30 cm of soil and benefit enormously from the moisture retention, temperature moderation, and biological activity that a 10-15 cm deep mulch layer provides. Use wood chips rather than fine compost, which can mat and restrict water penetration.
5. Feed Hass avocado trees with a fertilizer formulated specifically for avocados or citrus, applied in small amounts monthly rather than large applications quarterly. Avocados are particularly sensitive to salt burn from over-fertilization and to phosphorus toxicity, so choose a low-phosphorus formula. Ensure the fertilizer includes zinc and boron, which are critical micronutrients for avocado flowering and fruit set that are often deficient in garden soils.
6. Keep mature Hass trees pruned to a manageable height of 4-5 meters to allow practical hand-picking without ladders and to improve light penetration throughout the canopy. Unlike many fruit trees, avocados can be pruned quite hard and will regenerate vigorously. Carry out major pruning immediately after the main harvest, thinning out crossing and shading branches and reducing overall height by removing the tallest leaders.
7. Test avocado harvest readiness by picking one or two fruit when they reach full size and develop a slight darkening of the skin. Leave them at room temperature for 5-7 days. If they ripen to smooth, buttery, nutty-flavored flesh without stringiness or off-flavors, the rest of the crop is ready to harvest. Avocados left on the tree continue to accumulate oil and improve in quality for several months after reaching physiological maturity.
8. Protect young avocado trees from frost during their first three winters, as frost sensitivity decreases with age and trunk diameter. Use horticultural frost cloth, old bedsheets, or specialized tree wraps on nights when temperatures are forecast to drop below 2°C. Running a string of outdoor lights inside the cloth cover can add several degrees of protection. Never use plastic sheeting, which can cause condensation damage.
9. Water avocado trees deeply and infrequently rather than shallowly and often. The goal is to wet the entire root zone to a depth of 60-90 cm at each irrigation, then allow the top 5-8 cm of soil to dry before the next watering. Shallow, frequent irrigation encourages surface rooting and provides insufficient moisture to the deep feeder roots that sustain the tree during fruiting. A soil moisture probe is a worthwhile investment for avocado growers.
10. Watch the leaves as the tree's primary health indicator. Healthy Hass avocado foliage is deep, glossy green. Pale yellowish leaves indicate nitrogen deficiency or root problems. Brown leaf tips suggest salt burn from over-fertilization or chlorinated water. Stippled, bronzed leaves indicate mite infestation. Blackened leaf margins after cold nights signal frost damage. Responding quickly to these signals prevents minor issues from becoming serious problems.