The Seattle area is located in Plant Hardiness Zone 8, so cannas should be able to overwinter in your garden, as it sounds like they have in the past. If your winter was particularly cold, though, they may not have survived. If you’re not seeing any growth at all by now, you should dig them up and check for rot. Some rhizomes may have survived and can be replanted in another sunny area. Giving them a bit of 10-10-10 fertilizer could help too.
The Seattle area is located in Plant Hardiness Zone 8, so cannas should be able to overwinter in your garden, as it sounds like they have in the past. If your winter was particularly cold, though, they may not have survived. If you’re not seeing any growth at all by now, you should dig them up and check for rot. Some rhizomes may have survived and can be replanted in another sunny area. Giving them a bit of 10-10-10 fertilizer could help too.