showy purplish-blue bloom of floss flowers in garden in sunlight

ageratum annual aster asteraceae autumnal beautiful bloom bluemink blueweed botanical bush cluster clusters color colors colour colours corymbs dense dwarf floss flower flowerheads flowers fluff-haired fluffy foot garden grow growing growth herb herbaceous houstonianum lavender mexican ornamental outside paintbrush plant purple purplish-blue pussy pussyfoot ray showy shrub sunlight texture threadlike violet flowering sunny