At Phoenix Charter High School, the students are growing kale and many other veggies in our garden.
You can grow Kale anytime from early Spring to early Summer. How you plant Kale is you mix 1 1/2 cups of 5-10-10 fertilizer. Then you dig 3-4inches into the soil, and then plant the kale seeds 1/4-1/2 into deep, well-drained, light soil.
After about 2 weeks, thin the seedlings so that they can space apart(8-9inches)
Then just wait and boom! you got yourself some delicious kale!