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Marechal Foch hydrangea is popular in the florist industry while remaining uncommon in gardens, at least in gardens in the American South. It does well in our hot, humid Georgia garden, so maybe it will become more popular out-of-doors too.
It's a mophead that can (depending on Al availability) have saturated color and when deep blue, it is most often described as gentian blue. What "gentian blue" means for you in your garden is that the particular blue color of Marechal Foch is different that other blue hydrangeas. We like variety like that.
The heads are hefty, but don't fear - the stems are strong too. It's free flowering and floriferous and something a little different if you're one of those hydrangea gardeners who already has everything.
More will be available fall 2020. 🌱
mophead with potential for unique gentian blue (where soils are acidic and conducive to that coloration)
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
Give Marechal Foch hydrangea 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!