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Seed biology of jubatagrass (Cortaderia jubata)

  • Jennifer J. Drewitz (a1) and Joseph M. DiTomaso


Jubatagrass is one of the most invasive nonnative species along sensitive natural coastal sites of California. This study was designed to understand the biology of reproduction and seed longevity under field conditions. Jubatagrass can produce over 100,000 wind-dispersed seeds from a single inflorescence. Seeds are produced apomictically, and germination is directly related to seed size. Of the total seeds produced, only 20 to 30% were of ample size to readily germinate when exposed to light and under a temperature range similar to coastal environments. Seeds not exposed to light also germinated but at about 30% the level of light-exposed seeds. This suggests that exposed disturbed coastal sites with moderate temperatures have high potential for germination and establishment of jubatagrass. The percentages of germinable and viable seeds were not significantly different, indicating that jubatagrass does not have a primary dormancy. This was supported by field experiments demonstrating that seeds do not persist under natural conditions for more than 6 mo. These results indicate that an intensive 1-yr control program targeting established seedlings and mature plants should sufficiently manage existing populations. However, effective long-term management of jubatagrass must focus on anticipating environments susceptible to invasion, reducing new seed recruitment, and preventing subsequent seed germination and seedling establishment.


Corresponding author

Corresponding author. Weed Science Program, Department of Vegetable Crops, University of California, Davis, CA 95616;


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Ayeni, A. O., Agbato, S. O., and Majek, B. A. 1997. Seed depth influence on Mexican sunflower (Tithonia diversifolia) emergence and control. Weed Technol 11:417427.
Connor, H. E. 1973. Breeding systems in Cortaderia (Gramineae). Evolution 27:663678.
Connor, H. E. and Edgar, E. 1974. Names and types in Cortaderia Stapf. (Gramineae). Taxon 23:595605.
Costas Lippmann, M. 1976. Ecology and reproductive biology of the genus Cortaderia in California. Ph.D. dissertation. University of California, Berkeley, CA. 365 p.
Costas Lippmann, M. 1980. Isozyme variability in Cortaderia selloana and isozyme constancy in C. jubata (Poaceae). Madroño 27/4:186187.
DiTomaso, J. M. 2000. Cortaderia jubata (Jubatagrass). Pages 124128 in Bossard, C., Randall, J. M., and Hoshovsky, M. eds. Invasive Plants of California's Wildlands. Berkeley, CA: California Exotic Pest Plant Council, University of California Press.
DiTomaso, J. M., Healy, E., Bell, D. E., Drewitz, J. J., and Tschohl, A. E. 1999a. Pampasgrass and jubatagrass threaten California coastal habitats. Davis, CA: University of California WeedRIC Cooperative Extension Leaflet 99-1.
DiTomaso, J. M., Kyser, G. B., and Hastings, M. S. 1999b. Prescribed burning for control of yellow starthistle (Centaurea solstitialis) and enhanced native plant diversity. Weed Sci 47:233242.
Eastin, E. F. 1983. Smallflower morningglory (Jacquemontia tamnifolia) germination as influenced by scarification, temperature, and seedling depth. Weed Sci 31:727730.
Fritzke, S. and Moore, P. 1998. Exotic plant management in National Parks of California. Fremontia 26/4:4953.
Fuller, T. C. 1976. Its history as a weed. In B.D. Cowan. The menace of pampas grass. Fremontia 4/2:1416.
Harradine, A. R. 1991. The impact of pampas grass as weeds in southern Australia. Plant Prot. Q 6:111115.
Hartmann, H. T., Kester, D. E., Davies, F. T. Jr., and Geneve, R. T. 1997. Plant Propagation: Principles and Practices. 6th ed. Upper Saddle River, NJ: Prentice Hall. Pp. 194210.
Hickman, J. C. ed. 1993. The Jepson Manual. Higher Plants of California. Berkeley, CA: University of California Press.
Maddox, D. M. 1981. Introduction, Phenology, and Density of Yellow Starthistle in Coastal, Intercoastal, and Central Valley Situations in California. ARR-W-20. Washington D.C.: USDA-ARS, Pp. 133.
Parsons, W. T. and Cuthbertson, E. G. 1992. Noxious Weeds of Australia. Melbourne, Sydney: Inkata. Pp. 103104.
Philipson, M. N. 1978. Apomixis in Cortaderia jubata (Gramineae). NZ J. Bot 16:4559.
Stanton, A. E. 2001. Cortaderia in California: Seedling Ecology and Management. . University of California, Davis, CA. 88 p.
Thompson, K., Band, S. R., and Hodgson, J. G. 1993. Seed size and shape predict persistence in soil. Funct. Ecol 7:236241.


Seed biology of jubatagrass (Cortaderia jubata)

  • Jennifer J. Drewitz (a1) and Joseph M. DiTomaso


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