If a gardeners.com coupon code isn't working, try the following steps:
- Check the expiration date of the coupon code.
 - Ensure the code applies to the items in the shopping cart.
 - Verify the code is entered correctly, without any typos.
 - Clear the browser's cache and cookies, then close and reopen the browser.
 - Try a different browser or device.
 - Disable any browser extensions that may interfere with the shopping experience.
 
If these steps don't resolve the issue, contact customer support for further assistance.