Cosmos – 3
Cosmos
Genus – the data refers to the whole genus Cosmos, not to a single species.
- Taxonomy
- Family: Asteraceae · Genus: Cosmos
Still missing: plant type, native distribution, natural habitat, height / growth form, flowering period, growth & dormancy period.
Tips & experience from members
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How members water it
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How it thrives
Waterlow
Lightfull sun
Humiditylow
Min. temperature3 °CJanuary
Nothing to do now – plan spring sowing and order seeds.
February
Nothing to do now – plan spring sowing and order seeds.
March
Sow indoors on a bright windowsill; plant out after the last frosts (mid-May).
Deeply, but only once the soil is completely dry.
First weak dose at the end of the month if it is actively growing.
The sunniest window (south or west).
April
Sow indoors on a bright windowsill; plant out after the last frosts (mid-May).
Deeply, but only once the soil is completely dry.
Liquid feed every 2–3 weeks.
The sunniest window (south or west).
May
Deeply, but only once the soil is completely dry.
Liquid feed every 2–3 weeks.
Best outdoors: sunny balcony, terrace or garden – acclimatise it to full sun gradually.
After mid-May (last frosts) it can go outside – keep it in partial shade for the first 1–2 weeks to avoid sunburn.
June
Deeply, but only once the soil is completely dry – more often in heatwaves, preferably in the evening.
Liquid feed every 2–3 weeks.
Best outdoors: sunny balcony, terrace or garden – acclimatise it to full sun gradually.
It flowers next month – once you see buds, don’t move it any more.
Above 35 °C, shade it at midday to prevent sunburn.
July
Deeply, but only once the soil is completely dry – more often in heatwaves, preferably in the evening.
Liquid feed every 2–3 weeks.
Best outdoors: sunny balcony, terrace or garden – acclimatise it to full sun gradually.
It usually flowers now – don’t turn or move it, and log the bloom in your diary!
Above 35 °C, shade it at midday to prevent sunburn.
August
Deeply, but only once the soil is completely dry – more often in heatwaves, preferably in the evening.
Liquid feed every 2–3 weeks.
Best outdoors: sunny balcony, terrace or garden – acclimatise it to full sun gradually.
It usually flowers now – don’t turn or move it, and log the bloom in your diary!
Above 35 °C, shade it at midday to prevent sunburn.
September
Deeply, but only once the soil is completely dry.
Liquid feed every 2–3 weeks.
Best outdoors: sunny balcony, terrace or garden – acclimatise it to full sun gradually.
Bring it in when nights drop below 8 °C. Check for pests first.
It usually flowers now – don’t turn or move it, and log the bloom in your diary!
October
It ends with the first frosts – collect seeds for next year.
Deeply, but only once the soil is completely dry.
No feeding now.
The sunniest window (south or west).
It usually flowers now – don’t turn or move it, and log the bloom in your diary!
November · now
Nothing to do now – plan spring sowing and order seeds.
December
Nothing to do now – plan spring sowing and order seeds.
It flowers better in poor soil – don't feed it or you'll get mostly leaves.
Cosmos – what to know
Cosmos: a plant genus (Asteraceae). Care guidelines: light: full sun; water: low; min. 3 °C. It is not known to be toxic to cats or dogs.
Frequently asked questions
How often should I water Cosmos?
Sparingly: let the soil dry out completely between waterings, and water even less in winter.
How much light does Cosmos need?
It needs plenty of direct sun – the sunniest window, or outdoors in summer, suits it best.
How cold can Cosmos get?
Keep it above 3 °C – it is frost-tender and needs a frost-free spot in winter.
Is Cosmos toxic to cats and dogs?
It is not known to be toxic to cats or dogs.
When does Cosmos flower?
Typical flowering time: July, August, September, October.
What members’ data shows
When does it really bloom?
No blooms logged yet. If yours flowers, your data will be the first!
Average watering interval
Not enough watering logs yet. Waterings logged in the care hub feed this chart.
Questions about this species
Care data is for guidance only.
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