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Cosmos observation

B3B3 Posts: 25,247
Bear in mind I live in London.
Cosmos purity and mixed pink jobs sown a bit early. Got leggy so I potted on and abandoned outside because I was fed up with them. Cold nights. They're not doing much but they're not dying either.

I have sown some more for nurturing inside just in case.

I think it's important to remember that cosmos generally survive well into November - here anyway. They are not particularly fragile.
I have these cosmos that don't look like cosmos because the leaves are wrong. They couldn't give a rat's about the cold. I wouldn't have bought them, but they were free.

Before I realised they needed cossetting, I used to sow them in trays outside. They did just fine.
You have a packet with more seeds than you could ever use - experiment and see what works in your garden and compost your mistakes.
In London. Keen but lazy.


  • This is Cosmos sulphureus. Like C. 'Purity' they are a half-hardy annual. If you have been unsuccessful with indoor sowings you could try direct sowing now. Cosmos are frequently included in annual meadow mixes and should germinate is sown outdoors now - if the weather bucks up a bit and the nights are warmer.
  • B3B3 Posts: 25,247
    I wouldn't advise direct sowing as slugs are partial, but outside sowing in smallish pots is definitely worth a try. If you sow them in pots rather than trays, there's no root disturbance.
    In London. Keen but lazy.
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