Calendula Facts Written by admin on June 17, 2017. Posted in Calendula, Facts, Flowers Botanical Name: Calendula Officinalis Plant Type: Annual Bloom Time: All Summer Best Location: Full Sun Soil: Well-drained, fertile Diseases: Powdery mildew, leaf spot, rust Pests: Slugs, aphids Propagation: Seeds Zone: 8-10 Continue Reading