Some suggestions from our followers on Twitter (www.twitter.com/gardendesignmag) include:
which are both European sites. Another twitter follower suggests planting the seeds from the top of the artichoke itself--anyone else have ideas?
I tried out rare seed at Plants of Distinction, producer and supplier of rare and specialist seeds and plants.
http://www.plantsofdistinction.co.uk including hard to find and heirloom varieties of fruit, vegetables and flowers