Certified GKH Gardening Expert
This is only hardy down to zone 7, so it will only be considered an annual in your area, outdoors. You should plant these in Spring, after all threat of frost has passed. You may want to dig some up before each winter if you would like to keep it around. It will die out completely in winter in your area.
This article will help you with their care: https://www.gardeningknowhow.com/ornamental/flowers/candy-cane-oxalis/growing-candy-cane-oxalis.htm