This year I decided to grow cosmos ‘Seashells’ (above), but it has taken a long time to come into flower. For a while, I didn’t think there would be any flowers at all. Now, however, the first few flowers have opened and there are plenty more buds for flowers to come.
I was worried that I had sown the seeds too late. (Sometimes there are just too many things wanting to be done at the same time in spring.) Even so, I hoped for a late show of flowers from them and they haven’t let me down.
I belong to a gardeners’ group on Facebook, and some of the members had been discussing the lateness in flowering of their cosmos plants. One of the group came up with the information that it’s simply because the plant is sensitive to day-length and needs a short day (long night) to be able to produce flowers.
That’s something that I would never have thought of before. Living in the UK, I tend to assume that flowers will want the longer days of summer. (I imagine that people who live in areas where cosmos are native or naturalised will be much more aware of the effect of the day-length.)
Apparently there are new varieties which don’t need the short days and can flower earlier in the summer. So next year I can either buy these seeds, or relax, take my time, and sow the older varieties a bit later. Or maybe try both – you can never have too many pretty flowers!