I grew several artichokes from seed last year, the variety is Violetto Preccoce. They produced a few small chokes last year and were about 2 feet high. This year they really took off in terms of grow, and currently between 5 to over 6 feet high, and they are producing lots of small chokes some of which I have removed and cooked, but they still come! I munched them earlier in the year with compost and have watered them. I chose the variety because it is thornless, but the current chokes, besides being small, also have prickley ends. What am I doing wrong.