I have Iberis (Candytuft) grouped around a sundial in the Moon Garden. It, Stachys 'Helen von Stein', and Bidens 'Peter's Gold Carpet' form a very casual intermittent sort of edging along the main garden pathway (not the stepping stones in and around the Moon Garden). I would use the Stachys in the Moon Garden itself, were it not used so much along the main pathway, and if it weren't for it's tendency to propagate so much and crowd other things out. (I confess that I also don't care that much for how mushy it is come late winter, and the clean up work I have to do to make it look respectable again.)
Right now the grey foliage in my Moon Garden comes from Dianthus and Cerastium.
I can't say that I ever cared for Angel Trumpets much... and aren't they poisonous? (I have a dog.)
I have heard of Knockout roses from my sister, who lives in Kansas. I'm not sure that I've ever seen any of them in the garden centers here. I currently have 'Marie Bugnet' in the Moon Garden, but I am considering moving it. I will be planting two 'Flower Carpet White' shrubs at the Moon Garden entrance this coming weekend (need garden help to move some irrigation heads). I have 'Flower Carpet Coral' along a narrow planting strip in my side yard, and it is colorful from spring into fall, so I am hoping for similar behavior from the white one. I also just took advantage of a recent online sale (now over) at www.heirloomroses.com, and have 'Saratoga' on order. (It is another white one, which I confess that I bought largely because of the name... we live in Saratoga, CA. It is supposed to be very fragrant, though.)
I forgot to mention re daylilies in the Moon Garden... Yes, they do not give a long season of bloom (not like a Pelargonium, for example). But I collect daylilies anyway, so the Moon Garden is a good place to put the near-white ones. Before the last of the daylilies has bloomed out, the white Dahlias have started blooming, so that's something. (And before the daylilies begin blooming, there are the white daffodils, followed by the white bearded irises.) Sometimes I get rebloom on some of the daylilies in late summer or early fall. I suppose I should take that into consideration when I work out which daylilies should go, and which ones I should replace them with. Rebloom is an iffy thing for me here, though.
