Colorful at Thompson Rd, opposite thomson medical centre. Very nice selection.
Nanyang Aquarium at Seletar Farmway also has quite a bit. Plus they have all you'll ever need in a fish tank.
Bioplast at Boon Keng Rd, blk22, that's like the "house of moss". Its a shop of moss, moss and moss. Almost any kind that you can ever find. no other plants though.
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