Has been doing well in my 6a gardens for 4 years now. I mulched it well the first two years, thinking it may be too tender, but I have not mulched it much for the last two years and it has done fine, both with and without mulch.

I also scattered some of the seeds last year, immediately after they became ripe, and to my surprise many have come up this spring and are doing well as first-year seedlings (at least the ones below the rock wall, where it stays a bit moister. The ones above the rock wall never came up. Got too dry, I believe). We had a very cold winter with lots of snow, so the snow cover may have helped. Only time will tell how the seedlings' flower colour will turn out. They look like it will take a few years before they are big enough to flower.

Mine do require a hoop stake to keep them from slouching too much.

The flowers have stunned the neighbors, and I've been asked what it is and where I got it. It has become one of my favorite flower discoveries/purchases.