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Yes, you can keep zinnias in containers. Just be sure to keep them well watered and moist since containers dry out more quickly. They'll still need lots of sunlight (6 hours a day). Feed the plants WEEKLY with a full strength, 5-10-5 fertilizer. (No timed-release fertilizer.) In terms of pot size, plant 1 zinnia per 6-inch pot, 3 zinnias per 10-inch pot, and 5 zinnias per 14-inch pot.