While there is a hybrid of Red Russian kale and Brussels sprouts that is sold as kale sprouts, the term sprouts or “micro greens” usually refers to kale and other plants that have been harvested almost as soon as they form.
Because the kale is harvested at such an early stage, you can crowd the seeds tightly together into a shallow container so that they will form a solid covering of greens when they sprout. Just make sure that the seeds are 1/4 inch to 1/2 inch deep.
Harvest your kale sprouts shortly after the first leaves or cotyledons make their appearance.
Spacing for Baby Kale
If you don’t have a lot of garden space or if you simply prefer the youngest leaves, you can grow baby kale.
Whether you plant your kale in your garden or in a container, make sure the seeds are 1/4 inch to 1/2 inch deep and leave 1 inch between the seeds. The first sets of leaves that appear are the cotyledons that are part of the seed. Wait until at least three sets of true leaves appear to begin harvesting.
Spacing for Growing Kale in a Container
Choose a container large enough to give each plant at least 6 inches of apace. Plant the seeds 1/4 inch to 1/2 inch deep and 1 inch apart. When the plants have two sets of true leaves with a third set forming, thin them to leave 6 to 12 inches between the plants.