If you have a question, you should find the answer here.

Can I use my reward vouchers online?

Great News!! You are now able to use your reward voucher to make purchases online.
 
Once you have logged in to the website click on "My Account" at the top right hand corner of the page.
 
Under the heading "The Garden Club" you will see a link to "view vouchers". Click on this link to be taken to the voucher page. 
 

To redeem online you will need to enter your reward voucher number at checkout, you can enter more than one, just “click to copy” those reward vouchers that you want to use. Or you can enter the 13 digit reward voucher number (starting 2400…) manually.

If you see a “Click to copy” and “Printable voucher” link below this means you have a reward voucher to use. If there’s no link it means it’s already been redeemed or has expired.