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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.

Bulb · Asteraceae family

Dahlia

Dahlia ×pinnata

Full sun to part shade 11¾ in–6 ft 2¾ in × 11¾ in–2 ft 11⅜ in Flowers July–October to −64 °F
Flower colors Click a color

In short a 10-second read

SunFull sun to part shade
Size11¾ in–6 ft 2¾ in
spacing 23½ in
FlowersJuly–October
PlantingApril–May
WinterLift and store for winter

Where to plant and how much to water

Sun, soil and water.

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

Sun

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

Soil

acidic to neutral soil
acidicneutralalkaline
averagehumus-richloamy

Watering

keep the soil evenly moistless when it rains

Frost

−64 °F
lift and store for winter

How much space it takes

Mature size.

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

19¾ in3 ft 3⅜ in4 ft 11 in11¾ in–6 ft 2¾ inspread 11¾ in–2 ft 11⅜ in
11¾ in–6 ft 2¾ in× spread 11¾ in–2 ft 11⅜ in

Plant 23½ in apart.

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: DecemberCare: JanuaryCare: FebruaryCare: MarchCare: AprilCare: MayCare: JuneCare: JulyCare: AugustCare: SeptemberCare: OctoberCare: NovemberCare: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlantingCare
Now, in October: nothing to do — the next job is in April.
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

July–October · red, pink, purple, orange, yellow or white

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

bulb: April–May

Care

JanFebMarAprMayJunJulAugSepOctNovDec

pinch out the tips (May–June)

Feeding

Nutrition.

Moderate
low nitrogen

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
Slugs and snails

Slugs and snails

High riskpestsource covers the whole genus
More about this problem

What you will see

Eaten holes in leaves and young shoots, at night and in damp weather. Young spring shoots are most at risk.

The source says: it is among the plants that slugs and snails seriously damage.

How to protect

  1. Prevention
    • Water in the morning, not in the evening.
    • In winter turn over the soil and remove fallen leaves — birds will pick out the eggs.
    • Encourage natural enemies (birds, toads, hedgehogs, ground beetles).
  2. By hand evening, spring to fallCollect slugs and snails in the evening by torchlight on a warm, damp night; traps made of hollowed-out citrus peel or small containers of beer sunk into the soil — empty them in the morning.
  3. Biological spring to early fallPhasmarhabditis hermaphrodita nematodes (they work on slugs, hardly on snails); apply to moist soil at 5–68 °F.
Slugs and snailspestHigh risk

What you will see

Eaten holes in leaves and young shoots, at night and in damp weather. Young spring shoots are most at risk.

The source says: it is among the plants that slugs and snails seriously damage.

How to protect

  1. Prevention
    • Water in the morning, not in the evening.
    • In winter turn over the soil and remove fallen leaves — birds will pick out the eggs.
    • Encourage natural enemies (birds, toads, hedgehogs, ground beetles).
  2. By hand evening, spring to fallCollect slugs and snails in the evening by torchlight on a warm, damp night; traps made of hollowed-out citrus peel or small containers of beer sunk into the soil — empty them in the morning.
  3. Biological spring to early fallPhasmarhabditis hermaphrodita nematodes (they work on slugs, hardly on snails); apply to moist soil at 5–68 °F.
More about this problem
Powdery mildews

Powdery mildews

Medium riskdiseasesource covers the whole genus
More about this problem

What you will see

White powdery coating on leaves and stems.

The source says: it is among the ornamental plants susceptible to powdery mildew.

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 onwardsMedium risk

What you will see

White powdery coating on leaves and stems.

The source says: it is among the ornamental plants susceptible to powdery mildew.

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

Earwig

pestsource covers the whole genus

What you will see

Eaten young leaves and petals, mainly at night.

When to look

JanFebMarAprMayJunJulAugSepOctNovDec
May–September

How to protect

  1. Prevention
    • From spring, check dahlias regularly.
    • Tolerate surface damage.
  2. By hand summerUpturned pots loosely stuffed with straw on canes; empty them in the morning.
Earwigpest · May–September

What you will see

Eaten young leaves and petals, mainly at night.

When to look

JanFebMarAprMayJunJulAugSepOctNovDec
May–September

How to protect

  1. Prevention
    • From spring, check dahlias regularly.
    • Tolerate surface damage.
  2. By hand summerUpturned pots loosely stuffed with straw on canes; empty them in the morning.

Gray mold

Botrytis cinerea
diseasesource covers the whole genus
More about this problem

What you will see

Gray-brown fuzzy coating and soft rot on dead and damaged parts, especially in damp weather.

When to look

All year

How to protect

  1. Prevention
    • Improve ventilation; do not plant too densely.
    • Remove dead leaves and flowers and do not leave them lying.
  2. By hand as soon as noticedRemove and destroy affected parts.
Gray molddisease · all year

What you will see

Gray-brown fuzzy coating and soft rot on dead and damaged parts, especially in damp weather.

When to look

All year

How to protect

  1. Prevention
    • Improve ventilation; do not plant too densely.
    • Remove dead leaves and flowers and do not leave them lying.
  2. By hand as soon as noticedRemove and destroy affected parts.
More about this problem

Dahlia mosaic virus

diseasesource covers the whole genus

What you will see

Stunting, spots and distortion of leaves.

How to protect

  1. Prevention
    • Use healthy planting material.
  2. By hand once noticedDig up and destroy affected plants.
Dahlia mosaic virusdisease

What you will see

Stunting, spots and distortion of leaves.

How to protect

  1. Prevention
    • Use healthy planting material.
  2. By hand once noticedDig up and destroy affected plants.
Sources (7)

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.

lemon daylily

lemon daylily

2 ft 3½ in–2 ft 7½ in
✓flowers May–June
✓lower — for the front
Japanese holly

Japanese holly

4 ft 11 in–9 ft 10⅛ in
✓flowers May–June
✓taller — for the back
Siberian iris

Siberian iris

1 ft 11⅝ in–3 ft 11¼ in
✓flowers May–June
✓lower — for the front

Frequently asked

Quick answers.

When does dahlia flower?

In July–October; the flowers are red, pink, purple, orange, yellow or white.

Does dahlia tolerate shade?

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

How much space does dahlia need?

At maturity 11¾ in–2 ft 11⅜ in wide and 11¾ in–6 ft 2¾ in tall; recommended spacing 23½ in.

Slugs and snails — what can you do?

Water in the morning, not in the evening. Collect slugs and snails in the evening by torchlight on a warm, damp night; traps made of hollowed-out citrus peel or small containers of beer sunk into the soil — empty them in the morning.

Earwig — what can you do?

From spring, check dahlias regularly. Upturned pots loosely stuffed with straw on canes; empty them in the morning.

Sources (12) Checked 2 September 2026

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