Another favorite of winter is Iris unguicularis...the winter-blooming iris. I just snapped this photo of a clump that’s been flowering for weeks here in the gardens. Iris unguicularis is relatively easy to grow if given a part or full sun site with good drainage. For us, we get random fall flowering that gives rise to a heavy bloom season in late winter….February and March. This year, we’re offering four different selected clones. Iris unguicularis can only be divided in fall/winter if you want it to survive. We’re getting quite a few reports of winters hardiness throughout Zone 6.