Last year I started a number of artichoke plants over the winter. I wasn't successful in giving them enough cold weather in order to bud the first year so I covered the plants with leaves in the fall and over wintered them. Despite losing all their leaves some new growth emerged in the spring and now I have two surviving plants.
The problem I’m facing now is they haven’t gotten any larger since they first came up. New leaves continue to form but the bottom ones die off leaving the plant no bigger. There are also no signs of a flower stalk. Is there anything I can do to help encourage flowering?