Don't know the current law, but for many years in the UK you were allowed to sell marijuana seeds as it was just the leaves that were illegal.

During that time, there was a special BBC news report where they found this mail order company selling marijuana seeds in a package with sun lamps, soil etc etc, pretty much everything you needed to grow your own weed. The head of the company insisted throughout an interview that the seeds were being sold as fishbait, with the gardening equipment just an unrelated bonus item.