Flora and Fauna News

Sonoran Desert Edition

Thursday, Mar. 14th, 2018
Vol. 21 No. 2

Heavy Perfume Hits
Orchards and Neighborhoods



PHOENIX, Az. ----- The flowering season for cultivated citrus trees is under way bringing heavenly sweet perfume wafting through urban neighborhoods and orchards. The perfume is most noticeable after dark when temperature inversions trap it close to the ground. A temperature inversion occurs when a layer of warm air sets above a layer of cooler air.

Citrus trees are widely cultivated in Arizona below about 750 m elevation where hard winter frosts are infrequent. These climate requirements are very similar to those of the Ironwood, Olneya tesota, and so the presence of this native tree was a sign that it would be safe to put in citrus orchards. Many citrus orchards have been converted to housing tracts where some of the trees were left for the future residents to tend. Today, however, most developers bulldoze the trees completely leaving new residents to purchase new citrus cultivars available from nurseries.

Current Weather Conditions in Phoenix, Arizona, USA, from the National Weather Service

Click for Phoenix, Arizona Forecast

Orange Blossoms scanned image © Mike Plagens.

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Flora and Fauna News, now in its 20th year of publication, appears several times
per month and provides current information about the birds, insects and plants
(natural history) living in the Arizona Sonoran Desert.
Copyright Michael J. Plagens, 2018
Send questions or comments to mjplagens@arizonensis.org

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