Eremurus
These spectacular plants, commonly known as ' Foxtail Lilies', make wonderful exclamation marks in the border, providing height without the need to stake.
They need a sunny, well-drained site, where they will build up into sizeable clumps in time, flowering in early summer. The tallest are the species himalaicus and robustus. Both will produce viable seed if not deadheaded but it may be preferable to remove the faded flower stems to encourage the plants to put their energy into building larger clumps.