Wallflowers are biennial plants, which means they live for two years, producing leaves in the first and flowers in the second. Buy them with bare roots and plant in fall, ready to bloom the following spring.
When to Start: Autumn
At Its Best: Spring
Time to Complete: 30 minutes
Try to plant your bare-root wallflowers as soon as you get them home. If you have to store them for a few days, wrap the roots in damp newspaper and keep the plants in a cool garage or unheated greenhouse. Then, just before planting, plunge the roots in a bucket of water for about 15 minutes.
Place clay pieces at the bottom of the pot and fill to within 2 inches of the rim with soil. Plant the feather grass at the back and violas around the front. Gently unwrap and separate the wallflowers.
Plant the wallflowers between the feather grass and violas, making sure that they are upright. Firm in and water well. Place the container in a sunny position. Water during dry spells and remove faded flowers.
Excerpted from How to Grow Practically Everything
© Dorling Kindersley Limited 2010