Yes you can, I can give you a link to my page, the text is one Swedish but I. Hope you can change it to France. If you need help with anything I have a friend at my work how can write in France! So just contact me..
If you drink Coffee I would say that u even can spread Coffee-ground around the plant's. I often do it around my tobacco and herbs. It's perfect against snail! Rose's don't have that problem but the snail can have a good hiding place in the roses..