Lucas & Randall (800-505-2505)and Expo Garden Tours (800-448-2685) are US companies that offer garden tours to those countries. You might try to search the web through www.dogpile.com or www.google.com and find a garden tour company in the country you wish to visit. That has worked well for me in finding UK garden tour companies.

Just remembered another tour possibility - The American Horticulture Society.

Contact Coopersmith's (they're on the Web at www.coopersmiths.com). They do garden-focused tours in Great Britain, Belgium, France, Italy, New Zealand and South Africa. Excellent accomodations (high end) and knowledgeable guides.

I took one of the American Horticulture Garden Tours to England. It was fabulous, and many of the people had been on AH tours before - always an excellent recommendation.

I haven't scanned in photos from all the gardens yet, but you can see some of them on my website.

Here is a link that might be useful: Gardens of England

I just remembered where I finally found lots of garden travel information - the 'better' garden magazines, especially the English ones. Try a bookstore like Borders and pick up an issue. There will be lots of ads with websites.

If you are age 55 or older (or have a friend who is,) check with Elderhostel.

Here is a link that might be useful: Elderhostel

Take a look at the Web Site of www.toursgallery.com
They have garden tours to Europe.

Here is a link that might be useful: Toursgallery

Gardenvisit.com is a useful site and you can e-mail for information on tour companies

Here is a link that might be useful: gardenvisit.com tour info