How to prune ageratum houstonianum 'artist blue'

Throughout the blooming season (late spring to fall). Pinch or snip spent flower clusters back to the nearest leaf node with fingers or clean scissors. Because 'Artist Blue' is very compact, a whole-plant light shear is rarely necessary — selective removal of faded clusters is sufficient.

Every 1–2 weeks as clusters fade. Ageratum 'Artist Blue' is a compact, self-tidying cultivar that needs less deadheading than taller types, but removing spent clusters regularly maintains the dense blue color. The low, mounding habit stays tidy without hard pruning. Occasional light grooming to remove faded heads and yellowing leaves is all this cultivar requires.

Pinch or snip spent flower clusters back to the nearest leaf node with fingers or clean scissors. Because 'Artist Blue' is very compact, a whole-plant light shear is rarely necessary — selective removal of faded clusters is sufficient.