How Do I Overwinter Lavender W/ 20- (below) Winters?

Question

I live in Iowa in zone 5a where our winters can drop as low as 20-degrees below zero. I have never got my lavender to survive one of our winters despite getting the Phenomenal Lavender that’s suitable to hardiness zone 4. I was wondering if you had any advise for getting lavender to survive such cold temperatures? Some winters we are even hit with a polar vortex! Thanks.

Answer 1

This article tells you how to cover it for protection against the winter winds.

https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-4/lavender-in-zone-4-gardens.htm