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This hugely impressive bulrush is, in the wild, found growing beside lakes and ponds. The flowers are catkins, which gradually turn brown, releasing downy seeds that get wafted away on the breeze. Plant it in an aquatic basket and it'll be well behaved, unable to spread by runners. If you have a large pond, set it in the mud, but be prepared to do an annual cull to stop it going everywhere. Plant it from 30-40cm deep under water. For small ponds stick to the 75cm-high Typha minima.