Diervilla sessilifolia 'Cool Splash®' is a compact, deciduous native shrub that brings season-long color and rugged performance to hard-to-plant areas. It forms a rounded, multi-stemmed clump and gradually spreads by underground suckers, making it a great choice when you want a plant to knit into a natural-looking colony.

Plant Diervilla sessilifolia 'Cool Splash®' in full sun to part shade for best growth and flowering. In early to mid-summer it produces clusters of small, trumpet-shaped yellow flowers that add warm color and draw in pollinators. This shrub is adaptable to many soil types and is known for handling dry conditions once established, which helps it perform in hot, exposed, or windy sites where other shrubs struggle.

Because it spreads, it can be useful on slopes and banks, along woodland edges, or in naturalized plantings where you want steady coverage over time. Give it room to expand, or edge and thin shoots to keep it contained. It also works well in shrub borders and as a low, informal hedge.

For simple care, water regularly during the first growing season, then reduce supplemental watering as the plant settles in. Prune in late winter or early spring to remove dead wood and encourage fresh growth, and trim lightly after flowering if you want a neater shape.

Specifications

• Cold hardiness zone: 4-8 (-30 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Mature height: 36-60"
• Spread: 36-60"
• Tolerant of: Drought
• Attracts: Butterflies, Hummingbirds
• Fragrant: Yes
• Native to the U.S.: Yes
• Good for slopes: Yes

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