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Chicago Botanic Garden rates bellflowers

Campanula 'Sarastro' rated at the top in Chicago Botanic Garden trials. (Photo courtesy Terra Nova Nurseries)

Campanula 'Sarastro' rated at the top in Chicago Botanic Garden trials. (Photo courtesy Terra Nova Nurseries)

One of the most tempting plants at garden centers is the bellflower, which always seems to be blooming.

Bellflowers (Campanula) are long-blooming perennials or biennials. In general, the plants spread by underground rhizomes, making some of them extremely invasive, so be careful about your choices.

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