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Annual · Asteraceae family

Common cosmos

Cosmos bipinnatus

Full sun 0.3–1.2 m × 0.6–0.9 m Flowers June–October Low maintenance
Flower colours Click a colour

In short a 10-second read

SunFull sun
Size0.3–1.2 m
spacing 45 cm
FlowersJune–October
Care levelLow maintenance

Where to plant and how much to water

Sun, soil and water.

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

Sun

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

Soil

tolerates any pH
acidicneutralalkaline
dry to averagesandyloamy

Watering

only in dry spellsdrought tolerant once establishedless when it rains

How much space it takes

Mature size.

The mature plant next to a person (175 cm).

50 cm1 m1.5 m0.3–1.2 mspread 0.6–0.9 m
0.3–1.2 m× spread 0.6–0.9 m

Plant 45 cm apart.

The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Months for Central Europe. The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberSowing: JanuarySowing: FebruarySowing: MarchSowing: AprilSowing: MaySowing: JuneSowing: JulySowing: AugustSowing: SeptemberSowing: OctoberSowing: NovemberSowing: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersSowingFeeding
Now, in October: nothing to do — the next job is in March. · watch for grey mould.
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

June–October · red, pink, white or yellow

Sowing

JanFebMarAprMayJunJulAugSepOctNovDec

direct sowing: April–May; sow indoors: March–April

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

April–May

Feeding

Nutrition.

Horn meal

up to 90 g/m² a year, if the soil needs it · April–May

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

Clusters of tiny sap-sucking insects on young shoots, curled leaves, sticky honeydew and sooty mould.

When to look

Spring – summer

How to protect

  1. Prevention
    • Aphids are part of a healthy garden and food for predators; a healthy plant usually tolerates them.
  2. By handWipe or rinse off colonies and remove affected tips.
  3. BiologicalEncourage natural enemies (ladybirds, earwigs, birds).
Aphidspest · spring – summer

What you will see

Clusters of tiny sap-sucking insects on young shoots, curled leaves, sticky honeydew and sooty mould.

When to look

Spring – summer

How to protect

  1. Prevention
    • Aphids are part of a healthy garden and food for predators; a healthy plant usually tolerates them.
  2. By handWipe or rinse off colonies and remove affected tips.
  3. BiologicalEncourage natural enemies (ladybirds, earwigs, birds).
More about this problem

What you will see

Irregular holes in leaves and slime trails, especially on young plants in damp weather.

How to protect

  1. Prevention
    • Changing growing practices is the best strategy; protect young plants.
  2. By handEvening collection by torchlight in damp weather; barriers (copper tape, wool pellets).
  3. Biological moist, warm soilPhasmarhabditis hermaphrodita nematodes watered into the soil.
Slugs and snailspest

What you will see

Irregular holes in leaves and slime trails, especially on young plants in damp weather.

How to protect

  1. Prevention
    • Changing growing practices is the best strategy; protect young plants.
  2. By handEvening collection by torchlight in damp weather; barriers (copper tape, wool pellets).
  3. Biological moist, warm soilPhasmarhabditis hermaphrodita nematodes watered into the soil.
More about this problem

Grey mould

Botrytis cinerea
disease
More about this problem

What you will see

Fuzzy grey-brown mould on dying buds, leaves, flowers and fruit.

When to look

JanFebMarAprMayJunJulAugSepOctNovDec
April–October

How to protect

  1. Prevention
    • Reduce humidity, improve airflow and do not plant too densely.
  2. By handQuickly remove dead and affected parts (carefully, as spores spread easily), ideally into a bag.
Grey moulddisease · April–October

What you will see

Fuzzy grey-brown mould on dying buds, leaves, flowers and fruit.

When to look

JanFebMarAprMayJunJulAugSepOctNovDec
April–October

How to protect

  1. Prevention
    • Reduce humidity, improve airflow and do not plant too densely.
  2. By handQuickly remove dead and affected parts (carefully, as spores spread easily), ideally into a bag.
More about this problem
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.

garden tulip

garden tulip

0.25–0.6 m
✓flowers April–May
✓lower — for the front
Siberian-tea

Siberian-tea

0.3–0.45 m
✓flowers April–May
✓lower — for the front
Bugle

Bugle

0.15–0.3 m
✓flowers April–June
✓lower — for the front

Ready-made Studio combinations with this plant

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

Cutting bed — Common cosmosCutting bed — Common zinniaCutting bed — purple coneflowerCutting bed — Chinese peony
Cutting bedAnnual cosmos and zinnias with coneflower and peony — flowers for the vase from June to October.Open in the Studio

Frequently asked

Quick answers.

When does Common cosmos flower?

In June–October; the flowers are red, pink, white or yellow.

When do I sow Common cosmos?

In March–May (direct sowing, sow indoors).

Does Common cosmos tolerate shade?

No, it needs full sun.

How much space does Common cosmos need?

At maturity 0.6–0.9 m wide and 0.3–1.2 m tall; recommended spacing 45 cm.

Aphids — what can you do?

Aphids are part of a healthy garden and food for predators; a healthy plant usually tolerates them. Wipe or rinse off colonies and remove affected tips.

Slugs and snails — what can you do?

Changing growing practices is the best strategy; protect young plants. Evening collection by torchlight in damp weather; barriers (copper tape, wool pellets).

Sources (17) Checked 17 October 2026

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