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Bittercress  (Cardamine hirsuta)  is a nuisance weed in the ornamental nursery industry. Seed formation and dispersal during propagation production at an ornamental nursery were studied. There is much variability in silique number and seed per silique with the means being 77 and 29. respectively after five weeks. Average number of seed produced was 2233 per plant. The seeds arc forcefully expelled with a mean distance of 61 cm. Germination of these freshly released seeds was 90% after 13 days with a generation time of nine weeks. Seed source in the nursery was from either the gravel floor or reuse of the propagation containers. Comparing germination of bittercress seedlings in dirty or cleaned containers, use of dirty containers resulted in significantly higher numbers of bittercress seedlings than the cleaned.

850 PB 393 GROWTH AND DEVELOPMENT OF BITTERCRESS IN AN ORNAMENTAL NURSERY