Calendula Flower Seeds. Calendula seeds are reasonably cold tolerant so I get them in the ground about two weeks before the last frost is predicted. If you plant calendula too late in the season when the temperatures are a lot warmer the plant tends to be weaker.
Sow Calendula seeds in succession every 2-3 weeks until early Summer for continuous blooms. Make 2-3 successive sowings 2-3 weeks apart for continuous blooms from summer until heavy frost. Calendula blossoms are also rich in carotenoid and can be used as.
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Sow them directly outdoors a few weeks before last. Calendulas are hardy annuals so can be sown and grown in the spot you want to flower. Roll over image to zoom in. If you plant calendula too late in the season when the temperatures are a lot warmer the plant tends to be weaker.