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Why are Diervilla and Weigela species widely cultivated in temperate gardens?

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Dipsacales Fragrant tubular blooms of *Viburnum carlesii* (Korean spice viburnum).

Diervilla and Weigela species are widely cultivated in temperate gardens primarily because they are valued as ornamental shrubs for their colourful flowers.1

Specifically, Weigela is a genus of East Asian flowering shrubs that is popular in horticulture for the tubular, white to red blossoms that appear during the spring and summer. Both genera belong to the Diervilla clade within the order Dipsacales, a group of plants well-known for its many ornamental members.21