Hi all
I don't know if it is legal or not, but IME the most important thing is to buy to reliable shops or buyers. At the beginning I was very tempted to buy quite a lot to some shops in Spain (where I live) and to people on second hand websites... But I had one or two bad experiences with bad identification (yes, absolutely wrong identification), poor quality (you can have problems with one plant, but it is strange when all of them melt in a few days) and poor quantity. IMO unless you are a rare plant hunter or if it is not an exchange between known people (I.e. Ukaps members) it is not worth. Tropica 1-2-Grow is my favorite. In Spain we pay between 5 and 7 euros per pot, the quality is superb and the quantity quite impressive.
Jordi