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This study was conducted to investigate the growth responses and ground-covering ability of Wedelia robusta and Vinca minor as influenced by 4 different levels of shading (0%, 35%, 55%, and 75% shading). The growth of Wedelia robusta was promoted in proportion to the higher light intensity. Top dry weight and ground-covering area after 4 months in natural condition were the greatest (1600g and 2.1 ㎡, respectively). However, Vinca minor grew best under 35% to 55% shading condition and poorest under full sunlight condition. Sunburn on the leaves of Vinca minor was noted under full sunlight. Number of leaves, Number of branches, dry weight, and ground-covering area showed a marked increase in 55% shading condition. Chlorophyll contents of Wedelia robusta and Vinca minor increased in proportion to the lowering light intensity, and net photosynthesis showed the same pattern with other growth responses.
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