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Olneya tesota Observations
(desert ironwood)
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Introduction to the NPN Native Species Observation Program
Desert ironwood is a multistemmed large evergreen shrub with thorns and a gray trunk that slowly grows to a size of 15-30ft. The plant has pinnately compound, thick oval gray-green leaflets, and 1/2in wide lavender flowers that bloom during a short period in early spring. Fruit consists of a pod containing dark seeds, 2in long, 1/2 to 1/4in across.
Source: Master Gardeners of the University of Arizona Pima County Cooperative Extension
You should record when two well-defined phenological events occur for desert ironwood:
- First bloom (FB) First select several plants for observation, and then record the date when first flowers are open in at least three places on the observed plants
(Photo by Taly Drezner).
- Mid bloom (MB) This is the date when 50% of the flowers are open on the observed plants.
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Please record average dates for each event among multiple plants of the same species. Report by email if any plant appears in poor health or event dates for same-species plants vary by more than a few days.
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