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Oh good, you like pastels. We do too - they are cool and calming.
Decatur Blue bigleaf hydrangea is a classic blue pastel from Georgia.
It's a remontant mophead, akin to Endless Summer and Penny Mac. Remontant means it will rebloom a second time later in the summer or, should a frost kill the first round of spring flowers, Decatur Blue will regrow and set flower buds again so you'll at least get that second round.
pastel blue or pink mohead
remontat - meaning it will rebloom to flower twice during long growing seasons
use as a substitute for any remontant mophead Hydrangea macrophylla
single specimen and accent use
large container use
grouping and massing - large swaths
flower and shrub borders
tolerant of salt spray so great for maritime climates
long flowering period
Decatur Blue bigleaf hydrangea, bigleaf hydrangea, french hydrangea, mophead hydrangea, hydrangea, hortensia
USDA Hardiness Zones
flowering shrub, deciduous
Spring: medium green
Summer: medium green
Fall Leaf Color Quality
Native to USA?
Soil Moisture Requirements
moist-but-draining, no standing water
Soil pH Requirements
acid, neutral, alkaline
sun, part shade, shade
To Make It Thrive
Give Decatur Blue rich soil plus consistent moisture in a soil that drains. It may require extra watering, but avoid standing water. Grow it in full shade or afternoon shade in the deep south (zones 8 and 9), not only for the foliage, but so the flowers don't get sun scald. Full sun is okay farther north. For flowering in cold climates, situate it in a warm sheltered location. During the ups and downs of spring temps here in Zone 8a - we cover to protect flower buds.
The flower color is not as you described, it's paler. Yes, I've come to the conclusion that Hydrangeas don't like to have their flower color profiled and clinically categorized like we humans try to do to everyone and everything. Please keep in mind that flower color varies widly and wildly depending on soil pH and the amount of aluminum actually in your soil, the amount of time aluminum has been availalbe to the plant (did you add Al only last month?), the unique propensity of how each cultivar reacts to Al, and if the flower heads get a touch of sunshine as they age.
The flower color is not as you described, it seems darker to me. Same issues as when it's paler; say after me, "a-lum-i-num-a-vail-a-bil-i-ty plus time plus cultivar plus a touch of sunshine."
This is science for sure, but also a whole lot of art. Enjoy the outcome Mother Nature deals!