The newer edition is preferable. Also, try The Gardener's Guide to Growing Salvias, by John Sutton. This book is written from the English point of view. Finally, keep your eye out for another book of Salvias by your countryman, Christian Froissart. I do not know what the name or publishing date will be. Perhaps Robin Middleton will know. I do not think thaty info is posted on his web site, but that is surely worth a visit.

Here is a link that might be useful: Robin's Salvias

hello and thank you for your information.

I don't think the book from Froissard is out yet, and I don't know that name either. I will be looking for it.

thanks again

pierre