Last updated on Thursday, March 9, 2023
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 Name : Kenneth W Leonhardt
Title : Spec in Hort
Unit : Department of Tropical Plant and Soil Sciences
Address : 3190 Maile Way
Honolulu, HI 96822
Room : St. John 19
Phone : (808) 956-8909
Fax : (808) 956-3894
E-mail : leonhard@hawaii.edu
Specialties : Ornamental crops with emphasis on protea and landscape trees
Professional Prep/Appointments :
Ph.D., Horticulture, University of Hawaii at Manoa, HI 1977
M.S., Horticulture, University of Hawaii at Manoa, HI 1973
B.S., Horticulture, California State Polytechnic University, Pomona, CA. 1971
HS Diploma, Royal Oak, Covina, CA. 1968
Projects :
Graduate Student Committees (since 2006)
David Lingenfelser, MS, 2012, Chair
Robert Saito, MS, 2012, Chair
Sterling Thomas, MS, 2012
Liz Huppman, PhD, 2012
Huang Yu, PhD, 2012
Peter Wiggins, MS, 2011
Tilden Miguel, MS, 2010, Chair
Will Rehrig MS, 2008
Emily Teng, MS, 2007, Chair
Thomas Littleton, MS, 2007, Chair
Hideko Kasahara, MS, 2007
Susana Vanzie-Canton, MS, 2006, Chair
Memberships
International Society for Horticulture (ISHS)
Chairman, International Protea Working Group (IPWG), 2002-2010
Courses Taught:
TPSS 200, Tropical Crop Production, 36 years (14 yrs as writing intensive)
TPSS 364, Horticulture Practices, 1 year
TPSS 402, Flower and Foliage Crop Production, 2 years
TPSS 492, Internship (writing intensive), 11 years
TPSS 664, Orchidology, 1 year
TPSS 499, directed studies, most semesters
TPSS 699, directed research, most semesters
Research Interests :
Developing improved varieties of ornamental plants for commercial producers.
Websites:
Some Photos:
TPSS students on field trip to California & Hawaii Foliage, Big Island
TPSS students on field trip to Florabunda Palms, Big Island
TPSS Hort Society students on field trip to Pacific Produce, Maui
TPSS Hort Society students on field trip to Whispering Winds Bamboo Farm, Maui
TPSS Hort Society students on field trip to Howard's Nursery, Maui
TPSS Hort Society students on field trip to National Tropical Botanical Garden Kahana, Maui
A good day of fishing off Oahu
Ken and graduate students: Emily Teng (North Carolina), Susana Vanzie-Canton (Belize), and Thomas Littleton (Costa Rica)
Susana's first international conference, Madeira, Portugal, 2007
Thomas in habitat, no bull
Susana preparing samples for flow cytometry
Polyploid stephanotis for lei and landscape purposes, created by Susana
Emily transplanting tetraploid dracaena she created
Jeana Cadby making shower tree hybrids
Ken at Agave tequilana plantation, Tampico, Mexico, 2006
Ken and Lita representing CTAHR in the Waimanalo Christmas Parade in their 1924 Model T Ford
Ken at the International Conference on Germplasm of Ornamentals, Beijing, China, July 2012
Publications :
Invited Keynote International Conference Presentations
Cultivar Development of Ornamentals using Leucospermum as an Example.
International Conference on Germplasm of Ornamentals, ISHS, Beijing,
China, July 2012.
Leucospermum Breeding and Cultivar Development at the University of
Hawaii. Jornadas Internacionales sobre la produccion y exportacion de
PROTEAS en Canarias. Santa Cruz de Tenerife, Canary Islands, Spain.
March 2007.
World Production of Tropical Cutflowers and Ornamental Plants. Flora
Filipina Conference on Sustainable Floriculture Industry in Asia. Manila,
Philippines. February 2006.
Presentations at Scientific Conferences
Producing Sterile Forms of Prolific Seed Producing Landscape Species.
International Conference on Germplasm of Ornamentals, ISHS, Beijing,
China, July 2012.
Creating Non-fruiting Forms of Prolific Seed Producing Landscape Species.
ASHS, Waikoloa, Hawaii, Sept. 2011 (invited).
Breeding and Selection of Leucospermum Hybrids for Tropical Climates.
ASHS, Waikoloa, Hawaii, Sept. 2011 (invited).
Creating Sterile Forms of Prolific Seed Producing Landscape Species.
Society of American Foresters, Honolulu, Hawaii, Nov. 2011 (invited).
Identification of Leucospermum Hybrids for Tropical Climates. IX
International Protea Research Symposium. ISHS. Stellenbosch, South
Africa. September 2008.
Production of Tetraploid forms of Eight Landscape Tree Species. VI
International Symposium on New Floricultural Crops, ISHS. Madeira,
Portugal. June 2007.
Evaluation of Leucospermum Hybrids for Warm-temperature Tolerance.
VIII International Protea Research Symposium. ISHS. San Diego,
California. April 2006.
Invited Presentations at Local and International Industry Conferences
Breeding Warm Temperature Tolerant Leucospermum Cultivars for Hawaii
Growers. Hawaii Floriculture Risk Management School, Hilo, Hawaii. July
2012.
Dendrobium Production and Marketing in Hawaii and Asia. Flora Filipina
Expo and Conference. Manila, Philippines. February 2009.
Inducing Sterility into Invasive Ornamental Plants by Chromosome
Manipulation. Flora Filipina Expo and Conference. Manila, Philippines.
February 2009.
Cycads of the World. Flora Filipina Expo and Conference. Manila,
Philippines. February 2009.
Research on Creating Sterile Street Trees. The 2009 Landscape Industry
Council of Hawaii, Green Industry Conference. Honolulu, Hawaii. Oct.
2009.
Cycads for Hawaii Landscapes. The 2009 Landscape Industry Council of
Hawaii, Green Industry Conference. Honolulu, Hawaii. Oct. 2009.
Recent Research in Development of Seedless Street Trees; and New
Ornamental Cultivars. The 2008 Landscape Industry Council of Hawaii
Conference & Trade Show. Honolulu, Hawaii. May 2008.
Development of New Ornamental Plant Varieties. Hawaii MIDPAC Expo
and Conference, Hilo, Hawaii. July 2007.
New UH Variety Development: Non-Fruiting Trees, Flowering Gingers,
Dracaenas, & Low Elevation Proteas for Hawaii Landscapes. Landscape
Industry Council of Hawaii 2007 Green Industry Conference & Tradeshow.
Honolulu, Hawaii. May 2007.
Development of New Ornamental Plant Varieties. Hawaii MIDPAC Expo
and Conference, Hilo, Hawaii. Oct. 2006.
New Protea Cultivars from the University of Hawaii. Hawaii Orchid
Growers Association 2005 Conference, Mini Trade Show & Nurseries Open
House. Hilo, Hawaii. Oct. 2005.
Development of New Ornamental Plant Varieties. Hawaii MIDPAC Expo
and Conference, Hilo, Hawaii. Oct. 2005.
Selected publications since 2005
Research publications (referred)
Miguel, T.P. and K.W. Leonhardt. 2011. In Vitro Polyploid induction of
orchids using oryzalin. Scientia Horticulturae. 130: 314-319.
Leonhardt, K.W. and X. Shi. 2009. Production of tetraploid forms of eight
landscape tree species. VI Internl Symposium on New Floricultural Crops,
ISHS. Madeira, Portugal. Acta Hort. 813: 133-139.
Teng, E.S. and K.W. Leonhardt. 2009. Optimum irradiation dosage of
unrooted Dracaena cuttings for mutation induction. VI Internl Symposium
on New Floricultural Crops, ISHS. Madeira, Portugal. Acta Hort. 813: 517-
522.
Teng, E.S. and K.W. Leonhardt. 2009. In vitro and in vivo polyploidization
of Dracaena with oryzalin. VI Internl Symposium on New Floricultural
Crops, ISHS. Madeira, Portugal. Acta Hort. 813: 509-515.
Vanzie-Canton, S.D. and K.W. Leonhardt. 2009. In vivo polyploidzation of
Zamioculcas zamiifolia. VI Internl Symposium on New Floricultural Crops.
ISHS. Madeira, Portugal. Acta Hort. 813: 531-537.
Vanzie-Canton, S.D. and K.W. Leonhardt. 2009. Polyploidization of
Marsdenia floribunda. VI Internl Symposium on New Floricultural Crops.
ISHS. Madeira, Portugal. Acta Hort. 813: 523-529.
Vanzie-Canton, S.D. and K.W. Leonhardt. 2009. In vitro callus induction
and plantlet regeneration protocol development for the oryzalin treatment of
Zamioculcas zamiifolia. VI Internl Symposium on New Floricultural Crops.
ISHS. Madeira, Portugal. Acta Hort. 813: 201-207.
Leonhardt, K.W., T.E. Littleton and M.G. Wright. 2008. Evaluation of
Leucospermum hybrids for warm-temperature tolerance. VIII International
Protea Research Symposium. ISHS. San Diego, California. Acta Hort. 805:
81-91.
Criley, R. A., K.W. Leonhardt, D. Oka and P. Shingaki. 2008. Extending the
flowering period of Leucospermum hybrids through disbudding. Acta. Hort.
766: 183-186.
Leonhardt, K.W., P. Shingaki, P. Nakao and D. Oka. 2005. Screening for
Warm-Temperature Tolerant Leucospermum (Proteaceae) Hybrids for
Cultivation in Low-Elevation Climates in Hawaii. Acta Hort. Vol. 683: 223-
232. CTAHR J. Ser. No. 4658.
Research and Extension publications (non-referred)
Cadby J. and K.W. Leonhardt. 2011. (poster) Identification and selection of
Oryzalin-induced tetraploid species for use in breeding sterile, non-invasive
landscape tree species. CTAHR Student Research Symposium. CTAHR,
UHM.
Leonhardt, K.W. 2009. (poster) 100 New University of Hawaii Protea
Varieties created for Hawaii growers.
http://www.ctahr.hawaii.edu/leonhardtk/Proteaposter.pdf
Leonhardt, K.W. 2008. Cymbidium species and hybrids for the Asian
tropics. Proc. The Fourth Asia Pacifiic Orchid Conference. Chiang Mai,
Thailand. Chiang Mai University.
Leonhardt, K.W. and J.M. Halloran. 2008. Dendrobium production
technology in Hawaii. Proc. The Fourth Asia Pacifiic Orchid Conference.
Chiang Mai, Thailand. Chiang Mai University.
Halloran, J.M., S.T. Nakamoto, K. Wanitprapha and K.W. Leonhardt. 2008.
United States retail and wholesale florists’ perceptions of dendrobium
orchids and buying practices. Proc. The Fourth Asia Pacifiic Orchid
Conference. Chiang Mai, Thailand. Chiang Mai University.
Leonhardt, K.W., P. Shingaki, P. Nakao, T. Jewell, T. Miguel and D. Oka.
2005. New Cultivars from the University of Hawaii Protea Research Project
- 1999 to 2004. Proc: Hawaii Floriculture Conference, CTAHR, UHM. pp.
53-79.
Caines, C. and K.W. Leonhardt. 2005. New Ornamental Ginger Cultivars
for Hawaii Cut Flower Growers. Proc: Hawaii Floriculture Conference,
CTAHR, UHM. pp. 25-27 & 80.
Littleton, T. and K. Leonhardt. 2005. (poster) Influence of Wounding,
Terminality, and Auxin Concentration on the Rooting of Stem Cuttings
of Four Leucospermum Species. CTAHR Student Research Symposium.
CTAHR, UHM.
Miguel, T., K.W. Leonhardt and Y. Sagawa. 2005. (poster) Polyploid
Induction of Orchids Using Oryzalin for Stud Plant Improvement. CTAHR
Student Research Symposium. CTAHR, UHM.
Miguel, T., K.W. Leonhardt and J.T. Kunisaki. 2005. (poster) In Vitro
Establishment of Protea 'Venus' and Protea aristata. CTAHR Student
Research Symposium. CTAHR, UHM.
Miguel, T., K.W. Leonhardt and Y. Sagawa. 2005. (poster) Polyploid
Induction of Orchids Using Oryzalin for Stud Plant Improvement. CTAHR
Student Research Symposium. CTAHR, UHM.
Teng, E., P.L. Nakao, J.S. Lichty and K.W. Leonhardt. 2005. (poster) Use
of GA3 and Cold Temperature Treatments to Induce Flowering in Dracaena.
CTAHR Student Research Symposium. CTAHR, UHM.
Vanzie-Canton, S. and K. Leonhardt. 2005. (poster) Identifying a Suitable
Medium for the In Vitro Establishment and Multiplication of Fatshedera
lisei. CTAHR Student Research Symposium. CTAHR, UHM.
Volumes edited (since 2005)
Leonhardt, K.W. and R.A. Criley. (eds). 2012. Bulletin. Journal of the
Heliconia Society International. Vol. 18(2), June 2012. 16 p.
Leonhardt, K.W. and R.A. Criley. (eds). 2012. Bulletin. Journal of the
Heliconia Society International. Vol. 18(1), March 2012. 16 p.
Leonhardt, K.W. and R.A. Criley. (eds). 2011. Bulletin. Journal of the
Heliconia Society International. Vol. 17(4), Dec. 2011. 16 p.
Leonhardt, K.W. and R.A. Criley. (eds). 2011. Bulletin. Journal of the
Heliconia Society International. Vol. 17(3), Sept. 2011. 16 p.
Leonhardt, K.W. and R.A. Criley. (eds). 2011. Bulletin. Journal of the
Heliconia Society International. Vol. 17(2), June 2011. 16 p.
Leonhardt, K.W. and R.A. Criley. (eds). 2011. Bulletin. Journal of the
Heliconia Society International. Vol. 17(1), March 2011. 16 p.
Leonhardt, K.W. and R.A. Criley. (eds). 2010. Bulletin. Journal of the
Heliconia Society International. Vol. 16(4), Dec. 2010. 16 p.
Leonhardt, K.W. and R.A. Criley. (eds). 2010. Bulletin. Journal of the
Heliconia Society International. Vol. 16(3), Oct. 2010. 16 p.
Leonhardt, K.W. (ed). 2009. Protea Newsletter International, Vol. 2, No. 1,
April 2009, 25 p.
www.ctahr.hawaii.edu/leonhardtk/PNI_2.pdf
Leonhardt, K.W. (ed). 2008. Proc. of the Eighth International Protea
Research Symposium. ISHS. San Diego, California. Acta Horticulturae. Vol.
805. 136 p.
Leonhardt, K.W. (ed). 2008. Protea Newsletter International, Vol. 1, No. 1,
November 2008, 19 p.
www.ctahr.hawaii.edu/leonhardtk/PNI1_1.pdfGerber, A.I. and K.W. Leonhardt. (eds). 2006. Proc. of the Seventh
International Protea Research Symposium. ISHS. Melbourne, Australia.
Acta Horticulturae. Vol. 716. 154 p.
Leonhardt, K.W. and P. Nakao (eds). 2005. Proc. Hawaii Floriculture Conf,
CTAHR, UHM. P-04/05. 115 p.
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