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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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Choose your climateBased on winter hardiness only.

Shrub · Rosaceae family

Rockspray cotoneaster

Cotoneaster horizontalis

Full sun to part shade in a garden 1 ft 11⅝ in–3 ft 3⅜ in × 3 ft 3⅜ in–4 ft 11 in Flowers May–June to −84 °F
Flower colors Click a color

In short a 10-second read

SunFull sun to part shade
in a garden after 10 years1 ft 11⅝ in–3 ft 3⅜ in
in the wild up to 3 ft 3⅜ in
spacing 4 ft 7⅛ in
FlowersMay–June
PlantingMarch–April, October–November
WinterNo winter protection
Watched as potentially invasive (DE, CZ) — keep it away from the wild and do not let it spread.

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 averagenot fussy about soil

Watering

only in dry spellsless when it rains

Frost

−84 °F
no winter protectionleafless in winter

How much space it takes

Mature size.

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

19¾ in3 ft 3⅜ in4 ft 11 in1 ft 11⅝ in–3 ft 3⅜ inspread 5 ft 10⅞ in–8 ft 2⅜ in
1 ft 11⅝ in–3 ft 3⅜ in× spread 5 ft 10⅞ in–8 ft 2⅜ in

Plant 4 ft 7⅛ in apart.

Reaches maturity in about 5–10 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). · watch for woolly aphid.
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

May–June · pink

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–April, October–November

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

May–June

What to plant now (October) full list in October (243) →

Feeding

Nutrition.

Horn meal

up to 0.13 oz/sq ft a year, if the soil needs it · May–June

JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

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

High riskMedium riskLow riskRisk for this plant according to the source · no label = no documented level

Fire blight

Erwinia amylovora
Medium riskdiseasesource covers the whole genus
More about this problem

What you will see

Shoot dieback.

The source says: it is among the most commonly damaged plants.

When to look

Spring – fall

How to protect

  1. Prevention
    • cut out late (secondary) blossoms before they open
    • do not overdo nitrogen
  2. By hand once found, late spring – fallcut out affected parts 11¾ in below the infected spot (thicker branches 23½ in) into healthy wood, disinfect tools, burn the cut-out parts
  3. Chemical — only when nothing else helps —No chemical product is available against fire blight
Fire blightdisease · spring – fallMedium risk

What you will see

Shoot dieback.

The source says: it is among the most commonly damaged plants.

When to look

Spring – fall

How to protect

  1. Prevention
    • cut out late (secondary) blossoms before they open
    • do not overdo nitrogen
  2. By hand once found, late spring – fallcut out affected parts 11¾ in below the infected spot (thicker branches 23½ in) into healthy wood, disinfect tools, burn the cut-out parts
  3. Chemical — only when nothing else helps —No chemical product is available against fire blight
More about this problem

Woolly aphid

Medium riskpest

What you will see

Colonies of dark aphids covered in white waxy fluff on the bark of branches; thickened soft swellings that may split in frost.

The source says: it is common on this cotoneaster.

When to look

JanFebMarAprMayJunJulAugSepOctNovDec
April–October

How to protect

  1. Prevention
    • check regularly from spring
    • tolerate a low infestation – it is often harmless
  2. By hand spring–summersquash colonies by hand where possible
  3. Biological all seasonencourage ladybirds, hoverflies, parasitoid wasps, ground beetles and earwigs; as shelter for earwigs, a pot loosely stuffed with hay
Woolly aphidpest · April–OctoberMedium risk

What you will see

Colonies of dark aphids covered in white waxy fluff on the bark of branches; thickened soft swellings that may split in frost.

The source says: it is common on this cotoneaster.

When to look

JanFebMarAprMayJunJulAugSepOctNovDec
April–October

How to protect

  1. Prevention
    • check regularly from spring
    • tolerate a low infestation – it is often harmless
  2. By hand spring–summersquash colonies by hand where possible
  3. Biological all seasonencourage ladybirds, hoverflies, parasitoid wasps, ground beetles and earwigs; as shelter for earwigs, a pot loosely stuffed with hay
Sources (4)

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.

orange coneflower

orange coneflower

1 ft 7⅝ in–3 ft 1⅜ in
✓flowers July–October
✓lower — for the front
gaura

gaura

2 ft 11⅜ in–4 ft 11 in
✓flowers June–October
✓taller — for the back
African Marigold

African Marigold

5⅞ in–3 ft 11¼ in
✓flowers June–October
✓taller — for the back

Frequently asked

Quick answers.

When does rockspray cotoneaster flower?

In May–June; the flowers are pink.

Does rockspray cotoneaster tolerate shade?

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

How much space does rockspray cotoneaster need?

At maturity 5 ft 10⅞ in–8 ft 2⅜ in wide and 1 ft 11⅝ in–3 ft 3⅜ in tall; recommended spacing 4 ft 7⅛ in.

Fire blight — what can you do?

cut out late (secondary) blossoms before they open cut out affected parts 11¾ in below the infected spot (thicker branches 23½ in) into healthy wood, disinfect tools, burn the cut-out parts

Woolly aphid — what can you do?

check regularly from spring squash colonies by hand where possible

Sources (15) Checked 24 October 2026

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