Hydrangeas are in shops now, so go grab yourself a couple, or take cuttings of your existing ones. I prefer these plants on their own in the vase, though occasionally I’ll see a nice mix of hydrangeas and foliage, like the display here (middle photo) by Olive & The Fox, with eucalyptus leaves and lady’s mantle (these are actually faux flowers – can you tell?). In the garden, though, I like my hydrangeas mixed, like this garden border (second image from the bottom) with white hydrangeas (‘Annabelle’), agapanthus, salvias and echinops, and some sort of ornamental grass at the back.
Hydrangeas like rich, moist but free-draining soil in partial shade. Dig in plenty of compost before planting and keep them well watered during the growing season.