Blue Cassel bigleaf hydrangea
Hydrangea macrophylla 'Blue Cassel'
USDA zones5 to 9
SunHandles partial sun to full shade
WaterHandles moderate or wet soil
Size3.5 to 4 feet tall3.5 to 4 feet wide
- Growth rate
- Rapid
- Habit
- Mounding
- Bloom season
- Summer
- Bloom color
- Blue
- Foliage color
- Green
- Soil types
- Sand, loam, clay
- Soil pH
- Acidic for blue flowers (pH 4.5-5.5)
- Toxicity
- Toxic to dogs, toxic to cats, toxic to horses
Garden uses
Notes
'Blue Cassel' bigleaf hydrangea (Hydrangea macrophylla 'Blue Cassel') is a shrub for borders, specimen plantings, shade gardens, and cut flowers. It is hardy to USDA zone 5, or down to -20°F (-29°C). This plant likes part sun to full shade and average to wet, sandy, loamy, or clay soil. Blue flowers open from early to late summer on a mounding shrub, and acidic soil with a pH of 4.5 to 5.5 keeps them blue. Deer tend to pass it by.
Pairs well with Dancing Queen hosta, Lady fern, Aureola Japanese forest grass, and Sally Holmes rose.