Hi Christine, welcome. Sounds like a good start. The candytuft might be fragrant. The Achillea I dont' believe is fragrant, and my The Pearl spreads like crazy. It is just flowering here and lasts a long time. Ground Hogs love it. I could probably list a ton of things that work for a white garden..if you check out the threads below you may come up with some ideas. ( Too many to list, not knowing your garden size, location, sun/shade, moisture etc.) Can I suggest some White Lilies Asiatic or Oriental or BOTH! They (Orientals) are fragrant and make a nice impact and are perennial and multiply. The Madonna Lily is nice as well as the trumpet lilies too. White Daffodils for the spring can be planted this fall along with lilies if you want to get a head start. White bearded Iris also last a while and show up nicely. There are just so many options. Christine, good luck, and write and let us know how you make out and what you decide on..and most of all, post some photos if you can. Have Fun..JoAnn