Try looking up Margot Koster and Crimson Star for comparison. http://www.clematis.hull.ac.uk/ http://www.clematis.hull.ac.uk/

I dug the diseased Sun Power out this morning. Used a shovel I don't normally use for gardening, and will disinfect it with a couple of my Lysol wipes, just to be safe. I also used disposable gloves instead of my normal gardening gloves. I stuck the plant in a plastic bag, and will throw it out next garbage day. I tried to get as many of the roots as I could distinguish from tree and lilac roots. I planted a non-hosta plant in the spot, to remember where it was, so I don't put another hosta there anytime soon. Thanks again for replying to my post, and letting me know about the HVX. I was saddened to lose it, but glad I found out now, while it was still easy to remove, than later when it was much bigger.

Compare to Blue Angel. Can you show us a closer view of the leaves. Here's a closeup. i thought of blue angel ... but would expect it to be much bigger in 10 plus years It's been pretty much the same size the entire 10 years, in fact, some years it's looked smaller than the year before. It's not in a great location, as it's in hard, packed down soil, and surrounded by tree roots. So maybe some of that has prevented it from getting bigger. compare flowers at library ... but note one seems to have white flowers.. and one tinged purple For the longest while, I thought the flowers were white. Then I realized there was a purple tinge. This year, however, there's a definitely purple to them. Maybe because it's getting more sun? I thought Blue Angel at first, but BA has a white flower that is very distinctive when it emerges. It loo like a star at on point. Here's a closeup of the flowers as they were just emerging.

@gardenchick2010, here are some photos I just took of my viridescent undulatas. They've finished blooming and are changing to green in order to get more photosynthesis done before the season is done. I understand that this change to green helps them set up what's going on underground now so they can come up bigger and stronger next spring. Some leaves turn fully green. Others go half-way, and some stay white. The clumps still look "white" in the context of the garden. Of course I wish they didn't need to turn green. My White Christmas hosta doesn't turn green, but it also doesn't get any bigger. As in, years and years of growth and the stupid thing, beautiful as it is, still only has a few leaves. Here are a bunch of undulatas in a clump out back, still looking more or less white right now mid-August. They are suffering from the drought, so look more thin than usual. Close up of that clump. You'll see every variation of viridescence. More closeups: At first reading I thought you were wanting to get rid of a plant that was reverting right in the middle of the season, one white leaf at a time, because you were worried it would come back eternally green in the future. On second reading, I now realize you thought your hosta was sick. Nope, not sick. It's just doing what it needs to do to get enough fuel to its underground parts now so it can work on growing bigger for the future. Those white leaf parts can't do photosynthesis. They are just decoration for our visual pleasure. Another note about undulatas: they grow better in full sun. But the white parts burn out. In full shade they barely grow; not enough photosynthesis can go on. I keep mine in as much sun as I can, and I ignore the fact that they get holes in them. I can do that because there are so many close to each other, so they read as a white clump, not as specimens to be admired one at a time. This hosta is no good for that kind of viewing. Here's my Night Before Christmas. It must be 8 years old. That's dianthus up next to it. It's been such a disappointment, given my desire for it to replace the undulatas. It's prettier and has more dense substance, though, than the undulatas. It just won't expand to fill a space that can be seen as part of a designed garden bed.