I can't say for sure that I've seen the kale before but I do remember swede in a blend we used. While I'm no expert, I think you're better off with a late summer planting. I would expect an early summer planting to get pretty woody and maybe even overmature to the point of unpalatability. Our experince was good with the swede blend. We usually plant on or about 8/10 in SE Wisconsin. In a normal year we'll have 12" to 18" plants by the end of September when, on average, we start looking at the first frosts. Maxi-Rack out of Spring Green WI, sells swede by the pound or in a blend (some kales also).