I never have much luck with carrots, but I always keep trying them. In late-May I carelessly spread two packets of seed over the area where some spring lettuce had just finished, and to my surprise I just picked a half-bushel of carrots in mid-August. I steamed some the day I picked them to go with a dinner for friends. The hit is usually my famous London Broil, but the carrots stole the show!
As carrots go, I think that the Nantes carrots are the best you can get, in terms of flavor. They are shorter than many other varieties, and are not tapered. The color is a deeper orange and the flavor is a very strong "carroty" flavor.
Texas A&M reports that Nantes holds up against heat better than most other carrot varieties, although I cannot verify this.
This plant has been said to grow in the following regions:
Galesburg, Michigan Lenoir City, Tennessee Houston, Texas