Still no flowers from my Cosmos, but I was interested to see Wisley had the same problem when I visited the flower show. Though most were flowering, there were some with no buds at all.
Cosmos Cranberry did very well, but I won't grow Tall Pinkie again. They come up at the same time as the very similar pink of the Japanese Anemone, but look like a Christmas Tree until they flower, so not useful in my garden.
Xanthos, although delicate, was very insignificant and Cosmos Brilliance looked like small Marigolds. I have given up growing the white ones as they always end up with tree trunk stems.
I love Cosmos, but as I have said previously on this thread, it will be in pots. Rich soil works well for perennials, but Cosmos needs something else. I am not sure what it is, but experimentation is part of the science and fun of gardenining,
Sorry, Paul! Not all grows well in Rutland Towers - the Japanese anemones have struggled through the drought but are not flowering, the fuchsia bush is now in the compost bin and the leeks are being bullied out of existence by grafted tomatoes.
All of my cosmos have grown huge this year even the dwarf varieties, all have flowered prolifically apart from the sensation which haven't flowered at all, saying that most of them have been decimated by storm Ali and are now laying across the lawn even though they were staked 😳. I love cosmos but will only be growing a few of them next year as I would like to see the other flowers in the border.
This happened to me last year, the plant got so fat it forgot to flower. Rest assured that it did flower eventually and was prolific when it did. It just meant that the flowering was short-lived as the frost eventually took it down. You can extend it by covering it over when frost is eventually forecast.
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Xanthos, although delicate, was very insignificant and Cosmos Brilliance looked like small Marigolds. I have given up growing the white ones as they always end up with tree trunk stems.
I love Cosmos, but as I have said previously on this thread, it will be in pots. Rich soil works well for perennials, but Cosmos needs something else. I am not sure what it is, but experimentation is part of the science and fun of gardenining,