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Raised garden bed I – solid 2⅜ in European larchRaised garden bed IRaised garden bedsRaised garden bed L – solid 2⅜ in European larchRaised garden bed LRaised garden bedsRaised garden bed U – solid 2⅜ in European larchRaised garden bed URaised garden bedsBed I with bench – solid 2⅜ in European larchBed I with benchRaised garden bedsBed L with bench – solid 2⅜ in European larchBed L with benchRaised garden bedsSolid bench – solid 2⅜ in European larchSolid benchSeatingPedestal bench – solid 2⅜ in European larchPedestal benchSeatingBench with planter – solid 2⅜ in European larchBench with planterSeatingGarden table – solid 2⅜ in European larchGarden tableSeatingTable and two benches – solid 2⅜ in European larchTable and two benchesSeatingSandbox with seating – solid 2⅜ in European larchSandbox with seatingFor kidsGarden steps – solid 2⅜ in European larchGarden stepsSlope & terrace

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Brick Premium bedsSeatingKids’ cornerSlope & terraceCustom-size bedLow wall & slopeBed for the patio
Choose your climateBased on winter hardiness only.

Perennial · Plumbaginaceae family

Hardy plumbago

Ceratostigma plumbaginoides

Full sun to part shade 5⅞ in–9⅞ in × 5⅞ in–1 ft 7⅝ in Flowers August–October to −84 °F
Flower colors Click a color

In short a 10-second read

SunFull sun to part shade
Size5⅞ in–9⅞ in
spacing 11¾ in
FlowersAugust–October
PlantingMarch–May, September–November
WinterMulch around the base

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun to part shade, in dry to average soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
dry to averagesandyloamyclay

Watering

only in dry spellsless when it rains

Frost

−84 °F
mulch around the basedies back in winter, regrows in spring

How much space it takes

Mature size.

The mature plant next to a person (69 in).

19¾ in3 ft 3⅜ in4 ft 11 in5⅞ in–9⅞ inspread 5⅞ in–1 ft 7⅝ in
5⅞ in–9⅞ in× spread 5⅞ in–1 ft 7⅝ in

Plant 11¾ in apart.

Reaches maturity in about 2–5 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Typical for a temperate climate (four seasons). The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberPlanting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlantingFeeding
Now, in October: a good time for planting (container plant).
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

August–October · blue

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–May, September–November

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

March–May

Feeding

Nutrition.

Light
balanced fertilizercompost or mulch
JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

What you will see

White powdery coating on leaves and stems.

When to look

From spring onwards

How to protect

  1. Prevention
    • Plant in a sunny, airy spot with good drainage.
    • Water in dry spells; plants that dry out are more susceptible.
    • Do not over-feed with nitrogen.
    • Water in the morning and do not leave leaves wet for long.
  2. By hand summer, fallCut out affected shoots; in fall remove and destroy fallen affected leaves.
Powdery mildewsdisease · from spring onwards

What you will see

White powdery coating on leaves and stems.

When to look

From spring onwards

How to protect

  1. Prevention
    • Plant in a sunny, airy spot with good drainage.
    • Water in dry spells; plants that dry out are more susceptible.
    • Do not over-feed with nitrogen.
    • Water in the morning and do not leave leaves wet for long.
  2. By hand summer, fallCut out affected shoots; in fall remove and destroy fallen affected leaves.
More about this problem

What you will see

Root and crown rot, the plant dies back.

How to protect

  1. Prevention
    • Rare.
  2. By hand once noticedRemove the affected plant together with its roots.
Honey fungusdisease

What you will see

Root and crown rot, the plant dies back.

How to protect

  1. Prevention
    • Rare.
  2. By hand once noticedRemove the affected plant together with its roots.
More about this problem
Sources (3)

What to combine it with

Same needs, different flowering.

They share the same sun and soil and flower in other months — so the bed flowers for longer.

tussock bellflower

tussock bellflower

3⅞ in–11¾ in
✓flowers May–July
✓taller — for the back
Dutch crocus

Dutch crocus

3⅛ in–5⅞ in
✓flowers March–May
✓lower — for the front
coralbells

coralbells

11¾ in–1 ft 5¾ in
✓flowers May–July
✓taller — for the back

Ready-made Studio combinations with this plant

Click a combination — the Studio opens a new raised garden bed with it already planted.

Fall glow — Japanese anemoneFall glow — showy stonecropFall glow — prairie dropseedFall glow — hardy plumbagoFall glow — woodland sage
Fall glowAnemones, sedum and low blue flowers open as the rest fade — from August to October.Open in the Studio
Carefree — bloody cranesbillCarefree — catmintCarefree — hardy plumbagoCarefree — blue fescueCarefree — cushion spurge
CarefreeTough perennials that cope with drought and a forgotten watering, blooming from April to October.Open in the Studio

Frequently asked

Quick answers.

When does hardy plumbago flower?

In August–October; the flowers are blue.

Does hardy plumbago tolerate shade?

It tolerates part shade (3–6 hours of sun), but not full shade.

How much space does hardy plumbago need?

At maturity 5⅞ in–1 ft 7⅝ in wide and 5⅞ in–9⅞ in tall; recommended spacing 11¾ in.

Powdery mildews — what can you do?

Plant in a sunny, airy spot with good drainage. Cut out affected shoots; in fall remove and destroy fallen affected leaves.

Honey fungus — what can you do?

Rare. Remove the affected plant together with its roots.

Sources (14) Checked 28 September 2026

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