Different kinds of fall greens are good to grow together in a single container. Different varieties of kale along with tat soi, arugula, mizuna and mustard greens grow at similar paces in similar conditions and are easy to seed.
Taken together they create a container that is both aesthetic as well as delicious. Start planting in late August and early September for ongoing yields throughout the fall. Scatter mixed seeds into potting soil and clover with a very thin layer of soil. Water gently and keep moist as the seeds germinate. Clear-cut baby greens for a crisp fall salad and wait for regrowth or wait until the plants get a little bigger and harvest select leaves.
My favorites would be:
Red Russian kale
Red Giant mustard
Golden frills mustard