Starting a container garden, need help?

All these plants wont fit in that size container. The plants need space to grow. I would put the bee balm, scabiosa and phlox in it only. Maybe you can get another container to put the rest. You can plant them when you get it in September. Of course you wont see the plant flower until next year if you are living in the Northeast. I plant my plants in pots which are on concrete and they grow wonderfully. Don't forget to fertilize them and water frequently because the heat of the concrete heats the soil and they need more water than if it were just in the soil.