The Sow Thistle blossoms really are quite pleasant to eat except that since the plant is such an aphid magnet one has to be very careful not to get "extra protein!" The leaves are quite good, too.
Since first posting about Sow Thistles, I have done some experimenting with the aphids, by the way. I brought some of the plants inside where I can keep an eye on them and keep them aphid-free for eating. But other plants I put outdoors next to different flowering plants and vegetables to see if the aphids on the Sow Thistle migrated to any of the other plants and so far they have not. The anecdotal wisdom on this is that the variety of aphid this plant attracts stays on the Sow Thistle and brings natural enemies of the other variety of aphids, the ones that attack our domestic plants. I haven't seen any lacewings yet, but neither have I seen any aphids on any of the other plants in my yard. Awesome! Now it is time to study up on natural enemies of the white fly, if any. Haven't seen any of those here yet either, nor any more of those awful Sphinx Moths.
Since all the "dandelions" around here are either Sow Thistle or some prickly tough kind of desert dandelion, I asked my brother to send me seeds from the nice big tender dandelions that invade his yard. He did and although they took a bit longer to grow than expected, finally today I had enough dandelion greens to saute with my breakfast eggs.
It is amazing how sweet and tasty the leaves become after they are cooked in a little butter, as they are rather bitter when eaten raw.