Les, I have many A. konjacs in my collection. Some receive a half day of direct sun (6 hours) and some receive about 2 hours. I also have some in filtered sun (no direct sun). I have not noticed a difference in all three situations although I do not have any that receive full sun all day. I think they may adapt to the lighting as they grow thru the summer months. Bob Kleiser plantbob@aol.com