I planted 4 asparagus crowns this spring. My husband purchased some seeds the same day. He sprinkled the seeds around where I had put the crowns not really expecting them to grow. Well they did and now I have a very thick asparagus patch. Do I need to thin it? Will so many plants interfere with getting an edible crop? He keeps telling me not to worry, that it grows in ditches but I really want to be able to eat from my patch in the next couple years. Thanks for your help!