SelecTree: Tree Detail
Persea americana 'Whitsell'
Photo Locations: Cal Poly State University - San Luis Obispo, CA
Utility friendly tree.
A hybrid patented in 1982 by Robert Witsell in Riverside, CA. Good for containers and greenhouses. Not very hardy, needs protection from wind. Whitsell has a "B" 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)
Persea americana var. drymifolia 'Whitsell'
Oval, Rounded or Umbrella Shape.
Has Evergreen foliage.
Height: 12 - 15 feet.
Width: 10 - 12 feet.
Growth Rate: 36 Inches per Year.
Longevity 40 to 60 years.
Leaves Elliptic to Oblong, Medium Green, No Change, Evergreen.
Flowers Inconspicuous. Yellow. Flowers in Spring or Winter. Has perfect flowers (male and female parts in each flower).
Black Single Seeded Berry, Large (1.50 - 3.00 inches), fruiting in Spring, Summer or Fall Edible.
Bark Light Gray, Furrowed or Smooth.
Shading Capacity Rated as Dense in Leaf.
Litter Issue is Wet Fruit and Leaves.
Tree Site Conditions & Constraints
Sunset Zones 19 - 24.
Exposure Full Sun to Partial Shade.
Loam or Sand Texture.
Slightly Acidic to Neutral Soil pH.
Seaside Tolerance is Good in South Coast.
Pests & Disease Information
Resistant to Oak Root Fungus. Susceptible to Aphids, Scales and Thrip, Anthracnose, Oak Root Rot, Phytophthora, Root Rot and Verticillium.
Health, Safety & Environmental Concerns
Branch Strength Rated as Medium.
Root Damage Potential Rated as Low.
None Known Health Hazard.
Special Uses & Values
Cite this tree:
SelecTree. "Persea americana 'Whitsell' Tree Record." 1995-2017. Jun 27, 2017.
< http://selectree.calpoly.edu/tree-detail/persea-americana-whitsell >