hi-1st posting. I'm growing artichokes in Victoria, BC, and the 1st bud is always fine. After that, some of the buds get a brown shriveling on the top,and the leaves develop a yellow band along the edges with brown spots later developing in the yellow band. I can't find any pictures of either viral or bacterial or fungal diseases that could be causing this. I am also wondering about a possible calcium deficiency? Thanks!!!