Some of my leeks are going to seed - which makes them completely inedible. I ODed on leeks this year - though I don't think you can have too many. The Hannibal leeks are still growing well, but the Bleu de Solaise seem to be an autumn harvest variety,(though they were sold as a good overwintering variety), and a good many of them are producing seed heads.
I should remember to sow those ones early, and the Hannibal later, to get a good crop from autumn on. And stick with the Hannibal, or another variety for winter eating.