One of the earlier blue cultivars hardy to zone #5. Probably wouldn't waste my time growing this in zone #5, since it has been superseded by many other Hydrangea.
Pronunciation
(hy-DRAN-je-ah)(mack-row-FIL-ah)
Plant Type
All Plants, Shrubs Deciduous
Hardiness Zone
(5)6-9
Sunlight
full
Moisture
average
Soil & Site
ph of the soil will determine the color of the flower
Temperature
In zone #5 this plant has winter killed to ground level almost every year. This effects the flower production and ultimate size of the plant.
Flowers
blue in acid soils and pink in basic
Leaves
4-8" long, simple, opposite and have a fleshy, waxy feel
Dimensions
Can reach up to 6 feet but seems to winter kill back to the ground and the height is more around 3-4 feet.
Propagation
softwood cuttings
Author's Notes
My experience is this not a good dependable plant for hardiness zone #5 in southeastern Wisconsin. Very little flower production because of winter kill. But I have people tell me they have some luck with Nikko Blue.