Answer: Most of the annual transplants can be planted once danger of frost is past or slightly earlier if you are willing to cover them on cold nights. These plants as a group will bloom continuously all summer and provide lots of color. Alternatively, you can plant perennials to bloom sequentially through the summer, but they will each bloom for just a short period. These can be planted as soon as they are available. Herbs can also make good container plants. Many of the tropicals and non-hardy bulbs and tubers such as sweet potato vine, dahlias, cannas and caladiums do well in containers, too, and can be started now in pots in sunny locations where they can be protected on cold nights.
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