On impulse yesterday I bought a 4 pack of Winterbor Kale for my SFG. I have no experience with the plant, but checking online I am guessing 1 per sq ft. I have a flower bed on the north side of the house, but am afraid the plants would not get enough sun, but my SFG beds are on the south side of the house, and I wonder about too much sun. I guess I'll get them in the ground tomorrow 1 per square, unless someone has some wise words of experience for me.