Komatsuna...Extremely cold hardy, ultra-mild Asian mustard green. Almost as sweet as spinach, but even easier to grow.
Could it be that seed grown in upstate NY has an affinity for Chicago weather?
Also planted from HVSL: Chard Silverado and Collards Vates.
Plus from Franchi: Spinach Winter Giant and Lacinato kale.
We love the promise of spring greens...