Sara is telling us about her autumn flowers for Write Club 2011. Find her on Twitter as @hillwards; she blogs at Hillwards.

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As September draws to a close, our garden has suddenly seen an unexpected flush of late flowers alongside the ongoing performance from cosmos, antirrhinums and sweet peas.

From repeat bloomings on established roses – here the yellow rose by the shed

and the pale pink rambler along the front fence

– to the first late flowers on new plants raised or acquired in the past few months, most of which have only been in the ground for weeks.

A handful of flowers have sprung up from the Geranium ‘Orion’ plant that my mum gave us, which went into the ground about six weeks ago; with their long stems they nestle into the foliage of the cosmos behind. This should be spectacular next year, once it has found its feet.

Nearby, one of the clumps of Geranium sanguineum that I split and transplanted from the building rubble of the front garden earlier in the year has produced a single vibrant flower; its magenta petal edges seem to be lined in bright blue.

This pretty two-tone scabious was concealed beneath the leucanthemum, where it must have been blooming quietly for several weeks. It was the only plant to germinate from a packet of mixed seeds, and once planted out at the edge of the leucanthemum was quickly swamped beneath their rampant display.

Other plants are not quite so far advanced, their flowers still forming in a battle against the seasons.

This Eryngium planum ‘Blue Glitter’ was planted out as a small plug a couple of months ago and has grown tall through the summer and formed dozens of green flowerheads: will there be sufficient sun in the coming days to turn them blue before the frosts come?

One of the Gypsophila paniculata, raised from seed in the spring, is covered in tiny buds just beginning to burst open.

This tiny delphinium (one of 5 Delphinium grandiflorum chinese ‘Blue Pygmy’ plugs that arrived mid-summer and languished in pots before planting out ) has survived the slugs and is also budding up – will it bloom before the frosts?

The cardoon, meanwhile is also still holding its buds closed; another race against time.

I am thrilled by each new arrival, and anxious as to which of the remaining will fulfill their promise before the cold weather draws in, as we sit on the cusp of the seasons. But then, gardening is full of surprises and promises, both of which hold us in thrall.