The Avon Bulbs catalogue contains a gorgeous selection of spring-flowering bulbs including crocus, daffodils and tulips, along with further selections for autumn flowering bulbs such as colchicums.
The winning vouchers can be used at any time of year.
For the full range of bulbs available go to avonbulbs.co.uk
Complete the form below answering the question for your chance to win.
Alternatively, send your answer on a postcard along with your name, address and contact details to Gardens Illustrated/Avon Bulbs, PO Box 501, Leicester LE94 0AA.
Closing date 12 noon 23rd September.