The hydrangea as a houseplant

The hydrangea as a houseplant


Give the hydrangea a bright spot at the flower window. However, direct sunlight, especially during the hot midday hours, should be avoided.

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Room temperature

Hydrangeas can cope well with the usual room temperatures between 20 and 23 degrees. However, the beautiful flower umbels wither faster in consistently warm temperatures indoors.

to water

The hydrangea also needs a lot of water in the home. Always keep the substrate well moist, but avoid waterlogging. Pour excess liquid away from the planter or saucer after a few minutes so that the roots do not stand in the wet and start to rot. In regions with very hard water, you should water the houseplant with rainwater or filtered water, as too much calcium is poorly tolerated in the long run and leads to yellow, chlorotic leaves.

Blue hydrangeas need acidic soils

In the case of blue hydrangeas, it is advisable to occasionally treat the watering water with vinegar. The pH of the substrate should settle a little below seven. Check this soil value with test strips at regular intervals.


Hydrangeas do not do well in normal potting soil. So put the hydrangea in rhododendrons or azalea soil, which has the optimal pH value and stores water for a long time without becoming wet. It is repotted about every two years.


Hydrangeas that are indoors, like hydrangeas that have been transplanted outdoors, need a special fertilizer. Hydrangea, azalea or rhododendron fertilizers, which you add to the irrigation water once a week during the growth phase, are suitable.

Blue hydrangea flowers

These varieties have to be supplied with blue fertilizer once or twice a year. Alternatively, you can dissolve about six grams of aluminum sulphate, which you can get at the pharmacy, in the watering water once in the spring.

Special features in care

  • Regularly break out the faded so that the plant sets new flowers.
  • After flowering, you can transplant the hydrangea outdoors.
  • Alternatively, you can overwinter the hydrangea in a cool, frost-free room.

Tips & Tricks

Since the whole apartment is often heated, you can bring the indoor hydrangea to a cool place overnight, for example the stairwell or bedroom. By doing this, the flowers will last longer.