Hydrangea macrophylla ‘Nigra’



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Hydrangea macrophylla ‘Nigra’

The lovely Hydrangea macrophylla ‘Nigra’ BLACK STEM HYDRANGEA is really all about the striking contrast of the dark purplish-black stems and the soft pastel colourings of the large mop-head blooms.
The colours in this refined variety are never garish. Plus blooms shade and mutate as the flowers mature through the season.
So for elegant and gentle colouring, plus the contrasting drama of the black stems, Hydrangea macrophylla ‘Nigra’ Black Stem Hydrangea, is a one-off.
It is a deciduous, rounded shrub up to about 1m high and wide.  

Choose your flower colour

Powder blue blooms are produced in acid soil and soft pink in acid soil, both with soft green and cream flushes.
Add aluminum sulfate to the soil to make the flowers bluer or add lime to the soil to make the flowers pinker.
You are best to do this in late autumn or early spring, so that the bush has taken it up well before flowering in the summer.
Glossy mid-green foliage also makes a great contrast against the shiny black stems.

Easy care & low maintenance

Black Stem Hydrangea blooms on old wood. So if you need to prune, do it straight after flowering, so you are not cutting off the next years flowers. Do not trim back stems that have not yet flowered.
Fortunately Black Stem Hydrangea is a naturally neat and compact grower,. So it can happily go along without pruning, until you really want to re-shape it for cosmetic reasons. 
Although this Hydrangea seeps old fashioned charm, in fact it is a relatively recent release by the National Arboretum of the United States in 1993. 
Fortunately it has a good dose of hardiness, as well as well as the delightful black stems and gentle flower colours.

Position in the garden

Like most mop-tops, Black Stem Hydrangea enjoys Shade; Part Shade; Dappled Sun and Shade in Woodland conditions. Again like most mop-tops it needs medium amounts of water regularly. They love mulch and can tolerate summer humidity.
Perfect under trees and shrubs.

Growing: Hydrangea macrophylla ‘Nigra’

– Height with flowers: 50cm – 100cm approx.
Width: 70cm – 100cm approx.
– Position: Deep Shade, Woodland Shade, Dappled Sun, Morning Sun.
– Soil: Well Drained and with plenty of mulch.

– Frost: Very frost hardy being able to withstand down to at least -10C. and more.
– Growth: Deciduous Shrub
– Beneficial for wildlife: Because all the flowers are sterile, mop-head Hydrangeas are of no use to bees or butterflies.
– Beware: Hydrangeas have a level of toxicity, but you or the pets have to eat more than a nibble to have effects. They are not tasty, so there is little temptation to graze (except if you are a rabbit). Some small percentage of people may have skin irritation, so wear gloves when pruning.
– Care: If their conditions are met, Hydrangea macrophylla are easy, low care.
– Deer & Rabbit resistant: Sadly, they will both place them at the top of their menu selection if they take a fancy.
– Origin: Native to woodlands in Japan.


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