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Gardening

Find tips and tricks to make your garden or allotment flourish on our Gardening forum.

Cosmos help!

34 replies

Fushia123 · 08/08/2025 19:37

I’ve grown these compost from seed. They are now in the garden and are robust and healthy. However there is not a bud to be seen! Have they come up blind? What have I done and how can I remedy this?

Cosmos help!
Cosmos help!
OP posts:
StrawberrySquash · 04/10/2025 23:59

Mine have been mostly straggly and underwhelming. Except for the Xanthos pale yellow which bushed out nicely and produced loads of blooms.

Bunnycat101 · 11/10/2025 20:15

Mine were very late to flower this year but at the moment I’ve got loads of cosmos flowers. I’m sure they’re not meant to peak in October/November- it seems really odd. A lot of my poppies are re-blooming now as well.

ErrolTheDragon · 11/10/2025 22:40

StrawberrySquash · 04/10/2025 23:57

I think I heard Sarah Raven say that a lot of the seed is bred in Morocco and cosmos waits for the days to get shorter. Obviously our days in late summer take longer to get to the same shortness. And that can therefore delay flowering. She said you really want seed from here.

That’s interesting.
there’s some very nice pale yellow cosmos in a garden in our village. Maybe this cultivar is bred in Britain or a similar latitude such as the Netherlands.

StrawberrySquash · 11/10/2025 22:49

ErrolTheDragon · 11/10/2025 22:40

That’s interesting.
there’s some very nice pale yellow cosmos in a garden in our village. Maybe this cultivar is bred in Britain or a similar latitude such as the Netherlands.

Xanthos is pale yellow and has been my most successful this year. About to conk out, but just about still going

BestIsWest · 12/10/2025 09:56

Mine are now covered in buds.

Beebumble2 · 12/10/2025 10:31

I find that the deep pink ones flower later and the paler/white ones are smaller and flower earlier. I always plant a variety.

EssentiallyDecluttering · 12/10/2025 10:32

Beebumble2 · 12/10/2025 10:31

I find that the deep pink ones flower later and the paler/white ones are smaller and flower earlier. I always plant a variety.

Mine have been the other way round, the deep pink/purple ones have been out for a couple of months at least and the whites only started flowering this week.

Beebumble2 · 12/10/2025 10:43

EssentiallyDecluttering · 12/10/2025 10:32

Mine have been the other way round, the deep pink/purple ones have been out for a couple of months at least and the whites only started flowering this week.

That illustrates the quirky nature of plants!😂 I expect it depends on where you are in the country, soil etc.

EssentiallyDecluttering · 12/10/2025 14:58

They are in different places (the pink ones full sun, the white ones partial shade). I do notice at the allotments some people get flowering Cosmos far sooner than others even though they are similar light levels presumably similar soil although some will feed more than others, plant out at different times etc.

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