Often referred to as Northern bush honeysuckle, Diervilla sessilifolia ‘Cool Splash’ is an inaugural variegated form of Diervilla and will stop gardeners in their paths. Panicles of yellow trumpets cover this striking, variegated foliage, which will add a whole new dimension to the garden in late May or early June. “Cool Splash is a densely branched deciduous shrub that forms underground suckers, which develop into colonies over time,” said Guy. “When it is planted en masse in certain settings, like woodland gardens, it is absolutely spectacular.” Hardy to USDA Zones 4-9, it reaches an average height of two to three feet and thrives in part shade and moist, well-drained soil. The plant is part of the Novalis Plants that Work collection.