Bladder ketmia (Hibiscus trionum) is an increasingly problematic weed in the Australian cotton industry. Two varieties of the weed exist, narrow leaf bladder ketmia that can emerge, grow and produce seeds throughout the year, and wide leaf bladder ketmia that only grows throughout the cotton season, producing seeds in summer and autumn. Successive seedling flushes of the weed produce seeds within 46-62 days respectively, depending on the type. Between 2500 and 5000 seeds are produced on medium sized plants.