www.birstall.co.uk sometimes list it - I have some and it seems pretty simple to grow though growth rates are pretty slow. Keeps lower down if light levels are decent, and as with anything CO2 won't do any harm either. Mine are now looking really nice after a few months under decent light with EI and CO2, didn't do quite so well in my other tank though it didn't die, it just grew more slowly. I think Tropica may be one of the only companies to sell it in the UK, I have seen it on eBay but for really stupid money ~£10 for a single stem!