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Nemesia

This ideal cool-weather flower adds fragrance, color and an abundance of butterflies and hummingbirds to the garden. The foot-tall 'Aromatica Sky Blue' is one of the best in the series: a multitude of airy blooms cover these well-branched plants. Plant in full sun in well-drained soil rich in organic matter. Hardy to USDA Hardiness Zone 10

— image courtesy of Ball Horticultural Co.