Posted: 30/04/2015 at 13:40
That looks fine to start cropping now. Don't take more than two thirds of the leaves at any one time, and pull and twist so that the base of the leaf stalk comes away, don't cut or the base of the stalk will rot and set up rot in the crown. Twist the leaves off immediatelyi and compost.
Also take that flower stalk out from the base using the same twisting pulling motion.
Make sure it has plenty of water and when you finish harvesting (end of June) give it a good mulch with well rotted manure.