Posted: 09/04/2015 at 12:12
Yes should be fine. A good free draining mix with organic fertiliser and sifted compost and remember to keep soil moisture level even as possible. Not to let it dry out, etc. Carrots will split with uneven watering.
15" deep? You can grow most carrots there
(once grew what I called "crowbar carrots" ........made deep holes filled with sifted soil, compost and fertiliser. About 9" apart I think. The carrots were huge and, surprisingly delicious. Used to go out when people around to pull up a carrot and say "oh dear another tiny one". )