The Retirement Insurance Advisory Service (RIAS) is offering a months free cover on all RIAS Garden Secure policies taken out during the month following the Chelsea Flower Show, which ends this Friday May 26.
For a premium of £21 per annum, RIAS Garden Secure provides cover of up to £750 a year.
General secretary David Holden said: "Replacing just one fencing panel can cost £40 or more.
"One bad storm can wreak havoc in a garden and, sadly, theft from gardens has become more common."