Fragrant Deep-Pink Blooms for Shady, Wet Minnesota Gardens

Ruby Spice Summersweet (Clethra alnifolia 'Ruby Spice') brings rich, deep-pink fragrant flower spikes to late summer — the darkest pink of any summersweet, holding their color without fading. Like all summersweet it's a pollinator magnet that thrives in the shady, moist spots where most flowering shrubs sulk, finishing with golden fall color. Whether you're scenting a shaded rain garden in Edina, adding late color to a part-shade border in Woodbury, or planting for pollinators in Maple Grove — Ruby Spice brings fragrance and life to zone 4b–5a yards.

Ruby Spice Summersweet Plant Details

Ruby Spice Summersweet Uses in Minnesota Landscapes

Shade and wet spots

One of the few fragrant flowering shrubs for shade and wet soil, Ruby Spice shines in a shaded rain garden, low spot, or part-shade border under trees in Edina or Minnetonka.

Late color and pollinators

Its deep-pink, sweetly scented spikes fill the late-summer gap and draw bees and butterflies near a patio or path in Woodbury or Plymouth.

Borders and foundations

At 4–6 feet it anchors a part-shade border or foundation, with golden fall color to follow.

Best Time to Plant Ruby Spice Summersweet in Minnesota

Fall (late August–early October) is the ideal planting window. Soil is still warm for root development, cool air reduces transplant stress, and the plant gets 6–8 weeks to establish roots before ground freeze (typically mid-November in the Twin Cities).

Spring (late April–May, after the ground thaws) is the second-best window, giving the shrub a full season to establish before its first winter.

Avoid summer planting (June–August) when possible. Never plant after mid-October or before late April — frozen ground or frost-heaving kills new roots.

How to Plant Ruby Spice Summersweet

1. Dig wide, not deep — 2–3× the root ball width, same depth as the container.
2. It loves moist, even wet soil, so low and rain-garden spots are ideal; part shade is welcome.
3. Backfill with native soil mixed with 20–30% compost; it prefers acidic, organic-rich soil.
4. Space 4 feet apart for a mass; it may sucker mildly to form a colony.
5. Build a water basin to direct water to the roots; flatten it before winter.
6. Mulch 2–3 inches with shredded bark, kept off the stems. Prune in early spring if needed — it blooms on new wood.

Watering Ruby Spice Summersweet in Minnesota

First Year Watering Schedule

• Weeks 1–2: Every 1–2 days, deep and slow (15–25 minutes)
• Month 1–2: Every 2–3 days
• Month 3–6: Every 3–5 days; never let it dry out — it prefers steady moisture
• Stop watering 2–3 weeks before ground freeze (typically late October in the Twin Cities metro).

After Year One

Established summersweet prefers consistent moisture and tolerates wet soil — water deeply during dry spells; in a rain garden it often needs no supplemental water.

Drip Irrigation in Minnesota

If used, place emitters 12–18 inches from the crown and keep the root zone evenly moist. Always winterize the system — blow out the lines before freeze and shut timers off by early October.

How is Ruby Spice different from white summersweet?

It has the deepest pink flowers of any summersweet, and the color holds without fading — plus the same sweet fragrance and pollinator appeal.

Will it grow in shade and wet soil?

Yes — it's one of the best fragrant flowering shrubs for shade and thrives in moist to wet soil, ideal for rain gardens.

When does it bloom?

Mid-to-late summer, filling the bloom gap after spring shrubs finish.

Is it deer-resistant?

Yes — deer generally pass it by.

You May Also Like

• Sixteen Candles Summersweet — a compact white-flowered summersweet
• Hummingbird Summersweet — a dwarf white summersweet for small spaces
• Shop the full Three Timbers Minnesota catalog — zone 4-hardy plants hand-selected for Twin Cities yards