This description is for Aster dumosus: If you’re looking to add some vibrant colour to your garden later in the season, then the New York Aster will do that – and then some! Flowering during the late summer and autumn, Aster dumosus is a real cottage garden favourite. And you only need see them to realise exactly why. They spread quickly, and will fill borders or pots at a time of year that other plants are starting to fade for the oncoming winter. They can be found, depending on the sub-species, in varying shades of violet, pink, red and white.