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This study was conducted to investigate the effects of weed removal time on growth and flowering characteristics of Gladiolus. Weeds of thirteen species occurred in Gladiolus field, and issued weeds were Echinochloa crus-galli, Digitaria sanguinalis, Portulaca oleracea, Chenopodium album. As weeding time became later, the number of weed species decreased, but dry weight increased twice, especially prominent in grass weed. As weed removal time became later, plant height of Gladiolus was overgrowth, whereas leaf differentiation was delayed and days to flowering were lengthened. Flowering percentage also declined by being late weeding time, that of 8 weeks weeding after emergence (Gladiolus 5.3 leaf stage) and the weedy was 24.6%, 1.9%, respectively. So it was impossible for them to cut flower, because of low flowering percentage and blasted florets. As weeding time became later, cut flower length, floret number, and fresh weight were decreased, and from 6 weeks weeding after emergence (Gladiolus 4.4 leaf stage) they were highly decreased. Weeds damaged to lower flowering percentage and deteriorate cut flower quality after 4 leaf stage, especially in 5 leaf stage of Gladiolus. So we thought to surely control weed before 3 leaf stage in Gladiolus cultivation.
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