Container Grown Plants That Can Be Planted at Any Time A container full of living plants can brighten up any indoor or outdoor space at any time of the year. Seeds or Seedlings Starting plants from seeds will be the best option for much of the year. Microgreens Microgreens are immature leafy greens that are used in salad and stir-fry recipes. The seeds can be sown in a shallow container of soil and leaves harvested every 2-3 weeks. Root Vegetables Beets, radishes, carrots, parsnips, and turnips are easy to grow in containers and can be planted at any time of the year. Leafy Greens Kale, collards, spinach, and chard seeds can be sown and grown any time in containers. Herbs Herb plants are happy in a pot on a sunny kitchen windowsill. Herb seeds can be planted at any time in an indoor container.