SelecTree: Tree Detail
Persea americana 'Hass'
Photo Locations: LA County Arboretum - Arcadia, CA
Resistant to oak root fungus. Needs good drainage. Cross pollination increases fruit crop. Hass has a "A" flower type. Note: The avocado is unusual in that the timing of the male and female flower phases differs among varieties. There are two flowering types, referred to as "A" and "B" flower types. "A" varieties open as female on the morning of the first day. The flower closes in late morning or early afternoon. The flower will remain closed until the afternoon of the second day when it opens as male. "B" varieties open as female on the afternoon of the first day, close in late afternoon and re-open in the male phase the following morning. (source: http://www.ucavo.ucr.edu)
Erect or Spreading with a High Canopy.
Oval, Rounded or Umbrella Shape.
Has Evergreen foliage.
Height: 30 - 40 feet.
Width: 25 - 35 feet.
Growth Rate: 36 Inches per Year.
Longevity 50 to 150 years.
Leaves Oval, Dark Green, No Change, Evergreen.
Flowers Inconspicuous. Yellow. Flowers in Winter. Has perfect flowers (male and female parts in each flower).
Black or Purple Single Seeded Berry, Very Large (Over 3.00 inches), fruiting in Spring, Summer or Fall Edible.
Bark Light Gray.
Shading Capacity Rated as Moderate to Dense in Leaf.
Litter Issue is Wet Fruit and Leaves.
Tree Site Conditions & Constraints
Sunset Zones 16 - 17 and 19 - 24.
USDA Hardiness Zones 9 - 11.
Exposure Full Sun.
Loam or Sand Texture.
Slightly Acidic to Slightly Alkaline Soil pH.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Resistant to Oak Root Fungus. Susceptible to Aphids, Scales and Thrip, Anthracnose, Phytophthora, Root Rot and Verticillium.
Health, Safety & Environmental Concerns
Branch Strength Rated as Medium.
Root Damage Potential Rated as High.
None Known Health Hazard.
Cite this tree:
SelecTree. "Persea americana 'Hass' Tree Record." 1995-2018. Mar 17, 2018.
< https://selectree.calpoly.edu/tree-detail/persea-americana-hass >
SelecTree Nursery Connection Map
Cal Poly / ESRI