Do you use an AdSense search box on your garden blog?
The old version of AdSense for search is being retired. How do you know if you're using the old version of AdSense for search? The logo for the older version reads "Powered by Google" and the new version reads "Google Custom Search."
The official AdSense blog gives the following directions for upgrading to the new version:
1Visit your "AdSense Setup" tab and select "AdSense for Search."
2Select the sites you'd like your users to be able to search across.
3Customize the look and feel of your search engine results.
4Update the code on your website.
Make sure you upgrade to the new version before they make the switch so you don't lose any funds.