Bright Variegated Foliage That Lights Up the Shade

Cool Splash Diervilla (Diervilla sessilifolia 'Cool Splash') solves one of the hardest jobs in the yard: bringing light and color to dry, shady spots. Its crisp green leaves are boldly edged in creamy white, brightening woodland edges and north-facing beds where most shrubs sulk. Cheerful yellow flowers appear in summer to feed pollinators, and the tough, deer-resistant, spreading habit makes it a dependable problem-solver for Maple Grove, Woodbury, and Plymouth landscapes.

Landscape Uses

Cool Splash is ideal for brightening shaded foundation beds, woodland borders, and dry slopes where it also helps control erosion with its spreading roots. Pair it with hostas, ferns, and dark-leaved shrubs for striking contrast.

Best Time to Plant

Plant in spring or early fall while temperatures are cool and moisture is steady, giving roots time to establish.

How to Plant

Dig a hole twice as wide as the root ball and just as deep. Set the crown level with the soil, backfill, water in well, and mulch 2–3 inches deep, keeping mulch off the stems.

Watering

First Year: Water deeply 1–2 times per week to establish the roots.
After Year One: Water during dry spells. It tolerates dry shade well once established.
Drip Irrigation: A drip line provides efficient, even moisture as it gets established.

Frequently Asked Questions

Will Cool Splash grow in shade?
Yes. It's one of the best variegated shrubs for part to full shade and even handles dry shade.

Is it hardy in Minnesota?
Yes, it's hardy to Zone 4 and grows well across most of the state.

Is it deer resistant?
Yes, bush honeysuckles like Diervilla are generally avoided by deer.

Does it spread?
It spreads gradually by suckering, which makes it useful for filling shaded areas and stabilizing slopes.

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Pair Cool Splash with our other Diervilla selections and shade-loving shrubs for a bright, low-care woodland border.

How Many Cool Splash Diervilla Do I Need?

For massing a shaded bed or stabilizing a slope, plant on 3-foot centers and let the suckering habit knit them together; stagger rows for faster coverage. For a single bright accent among hostas and ferns, give it a 3–4 ft circle.

Cool Splash Diervilla Season-by-Season in Minnesota

• Spring: Crisp white-edged leaves emerge and immediately light up north-facing beds and woodland edges.
• Summer: Clusters of cheerful yellow trumpet flowers feed bees and other pollinators above the bright variegation.
• Fall: The variegated foliage stays clean late into the season before dropping.
• Winter: A low twiggy framework holds the slope; the suckering roots keep working on erosion control year-round.

At a Glance

✔ Pollinator-Friendly   ✔ Deer-Resistant   ✔ Drought-Tolerant   ✔ Shade-Tolerant

Plant It With

• Kodiak Orange Diervilla — sister diervilla with glowing orange fall foliage for a two-tone mass.
• Firefly Diervilla — compact gold-leaved cousin that doubles down on the brightening effect.
• Butterfly Diervilla — the green-leaved pollinator workhorse to weave between variegated plants.
• Gray Dogwood — tough native for the woodland edge behind this low, bright filler.

Is Cool Splash Diervilla Right for Your Yard?

Choose it if you're fighting dry shade — a north foundation, a rooty woodland edge, a shaded slope — and want bright variegation, summer flowers for pollinators, and zero deer drama. It's not a fit for formal gardens or tight beds where its gradual suckering spread would need constant policing.