Plant of the week: Wallflower 'Winter Joy'

What is it? There's nothing like the warm, spicy scent of a wallflower wafting around a spring garden. The mauve blooms of Erysimum cheiri 'Winter Joy' set against the foil of grey-green foliage are a cut above the rest. Expect it to flower from March to June if it's happy. Plant it with? You can't go wrong teaming wallflowers with tulips: the deep purple 'Caravelle' or the purple-pink 'Abigail' . Or plant in a pot or window box with violas and trailing ivy. The height and spread is about 60cm x 50cm, but plant close together and they'll support each other as they grow. And where? Full sun and poor, fast-draining soil (ideally alkaline). As the name suggests, they love being planted in and on walls. Any drawbacks? There's a bit of work to be done before the flowers arrive – you'll need to pot these plug plants on, grow them somewhere frost-free, then acclimatise them to the outdoors before planting out. What else does it do? 'Winter Joy' doesn't need deadheading – phew. Plus you can cut the blooms to bring inside and enjoy the scent. Buy it Order four 50mm plug plants for £12.99, or eight for £18.99 (including free p&p). Call 0330 333 6856, quoting ref GUA694. Or visit our Reader Offers page . Delivery from October.