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    HMI > Dr. Dirr Blog

Dr. Dirr Blog

  • 29 Mar

    Dr. Dirr Discusses: Aesculus pavia- Red Buckeye

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    By Dr. Michael Dirr
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  • 21 Jan

    Dr. Michael Dirr’s latest findings: Chionanthus retusus- (Chinese fringe tree)

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    By Dr. Michael Dirr
    Dr. Dirr Dr. Michael Dirr

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  • 16 Oct

    Dr. Michael Dirr’s Latest Findings: Magnolia Virginiana- Sweetbay Magnolia

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    By Dr. Michael Dirr
    Dr. Dirr Dr. Michael Dirr

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  • Korean Maple 04 Mar

    Dr. Dirr’s Spotlight: Acer Pseudosieboldianum – Korean Maple

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    By Dr. Michael Dirr

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  • 20 Nov

    Dr. Dirr’s Tree Spotlight: Quercus Lyrata-Overcup Oak

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    By Dr. Michael Dirr

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  • 28 Mar

    Dr. Dirr Tree Spotlight: Magnolia x soulangeana- saucer magnolia

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    By Dr. Michael Dirr

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  • Dr. Dirr’s Tree Spotlight: Liriodendron tulipifera (Tuliptree)

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    By Dr. Michael Dirr
    Posted on: 08 Oct

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  • 10 Sep

    Dr. Dirr’s Tree Spotlight: Acer triflorum – Three-flower Maple

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    By Dr. Michael Dirr

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About Dr. Michael Dirr

BS and MS, horticulture, The Ohio State University

Ph.D., plant physiology, University of Massachusetts

Currently retired, professor emeritus, University of Georgia.

Taught courses in woody landscape plants, plant propagation, and general horticulture.

Research activities cut a wide swath including salt tolerance, plant propagation, and plant breeding.

Introduced over 200 plants to cultivation, with 29 being patented while at the University.

Started a breeding company with two partners in 2006 and sold same in 2015 to Bailey Nursery, MN. At time of sale, the company, Plant Introductions, Inc., had generated 61 plant patents.

Written 8 books. The Manual of Woody Landscape Plants, now the 6th edition (2009), is the most widely used text and reference book in the United States.

Presently completing a North American tree book with Keith Warren, Schmidt Nursery, Boring, OR. Includes all major commercial species and cultivars and the newest introductions teetering on the horizon.

Was inducted into the National Academy of Inventors in 2011 and received the Inventor of the Year Award from the University of Georgia IN 2009.

Purchase Dr. Dirr's Encyclopedia of Trees & Shrubs

About HMI


Providing insurance adjusters and property owners with professionals to assist with emergency tree removals and consultative services to support subrogation analysis, liability claims, and large commercial losses involving plant material through a national network of credentialed tree care companies, ISA certified arborists, and other subject matter experts.

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