Calendulas are cheerful flowers but they are best thought of as annuals. Where winters are warm, they may come back for a year or two but not longer (short-lived perennial). Most of us rely on seed that falls in autumn ands germinates in spring to provide new plants every year. As frost approaches, leave the dead flowers on the plant so there will be lots of seed. Why yours did not self-sow can also be a weather issue. If winter was colder or wetter than usual, the seed may not have survived. I live in Michigan where seeds may not make it through the winter; so gardeners collect seed in the fall. Keep the seeds in a glass jar in the refrigerator and sprinkle them out in spring after danger of frost has passed. This is the one method that ensures you will have lots of calendula every year.
Answered on July 10, 2018
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