Gaura is a perennial flower for zones 5-9. If you live in northern Montana, it is too cold for Gaura to survive winters. It does not do well indoors and plants should be available in spring in zone 5. Gaura self-sows but transplant desired seedlings while they are only a few inches tall to minimize disturbance of the developing taproot. Here is a Montana map showing the hardiness zones. https://www.gardeningknowhow.com/planting-zones/montana-planting-zones.htm
Answered on December 23, 2018
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