Ageratum houstonianum
Botanical Name
Ageratum houstonianum
Hardiness
Half hardy annual
Height
6 to 15 inches
Width
6 to 12 inches
Flowers
Summer till frost: blue, lavender, white, pink
Light
Part shade to full sun
Soil
Well-drained
Planting and Care
Space compact plants 6 inches apart, taller varieties 9 inches apart
Problems
Powdery mildew in excess shade, root rot in poorly drained soils
Varieties to Consider
'Hawaii' Series - 6" compact; flowers of blue, royal blue, and white
'Blue Danube' - 7" and uniform
'Swing Pink' - 6-8" pink
'Blue Horizon' - 18", weather resistant flowers, long stems good for cutting
'LeiLani Blue' - 14-16" by 12"
'High Tide' - 24", dense, self cleaning
'Blue Danube' - 7" and uniform
'Swing Pink' - 6-8" pink
'Blue Horizon' - 18", weather resistant flowers, long stems good for cutting
'LeiLani Blue' - 14-16" by 12"
'High Tide' - 24", dense, self cleaning