i had thought about a bottemless container but i wanted to put the plant into a cat enclosure for some cover and something to play with sniff etc and the enclosure is a concrete base with bark chippings over the top (licensing laws etc!), weve gone for other plants now like the nice big ones in pots my OH's mum had in her garden lol and some other grasses and bamboos, they blend in quite nicley with the chunky wooden logs we built a climbing frame type thing out of! and the cats seem very happy!