What will grow on a wall?
Q Purple toadflaxis growing in poor, rubbly soil along the base ofan old garden wall. Are there other toadflax varieties or anything else I could growwith them?
R Dawson, Northampton
ALinaria purpurea (toadflax) produces spires of tiny purple or pink snapdragon flowers all summer. It's a vigorous, free-seeding perennial and thin, dry, free-draining
ground suits it best.
Other species include gorgeous perennial L.
Garden Designs Diy Photo Gallery
Click on Photos for Next Garden Designs Diy Gallery ImagesTriornithophora with curiously spurred, larger flowers in pink, mauve or yellow; tallish, yellow-flowered L. Dalmatica, and much smaller, weedier L. Alpina. Both these plants seed freely. Other lovely plants for naturalising in old, crumbly walls include red valerian Centranthus rubier, ivy-leaved toadflax Cymbalaria muralis, and smaller sedums.
Plants to try
Pretty purple and orange flowers are produced in a sunny spot in summer.
Grown in full sun, red valerian flowers bloom from late spring to autumn.
Ivy-leaved toadflax prefers shade and forms mats of dainty purple flowers.
All photos Shutterstock
QHow soon can I sow pelargonium seeds? I have a heated greenhouse.