And, sure, not all perennials live forever. But overall, perennials are a brilliant way to fill your outdoor space with colour and interest in every season, of course – and they're guaranteed to ...

‘Blue By You’ is a winter-hardy, heat-tough perennial that produces long spires of blue-purple flowers … and lots of them. The flowers attract bees and hummingbirds, but deer and rabbits don’t like ...

But even seedy veterans often overlook starting another class of plants indoors from seeds – perennial flowers. These are the ones that come back year after year from their own roots (at least ...