David / Rogan - I got some from Brian back in Septmeber, collected wild in Ferrara, Spain as I recall. Ask in the summer as most folks would have planted them straight away. This year I tried Ian's method of collecting and storing the seed in dry sand in a ziplock for a couple of months. They looked good when they were planted in late October.
I always cross-pollinate the ones in the greenhouse, otherwise no seed is set. I think they ripen in June.
johnw