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Hydrangea: How to Grow and Change Flower Colour
Flowers

Hydrangea: How to Grow and Change Flower Colour

Hydrangea macrophylla

Hydrangea care: deciduous shrub with huge spherical flowers. Loves partial shade and acidic moist soil. Colour changes with soil pH.

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Characteristics

Scientific nameHydrangea macrophylla
Height100-200 cm
Sunlightmezz'ombra
Wateralta
Soilacido umido
Toxicitylievemente tossica
Growthmedia
Temperature-15 a 30 °C
FloweringJun, Jul, Aug, Sep
IrrigationWater 3-4 times a week in summer, especially in full bloom: hydrangeas adore moisture.

Hydrangea macrophylla is a beloved deciduous shrub with huge spherical blue, pink or white flower heads blooming from June to September. It prefers cool partial shade, acidic constantly moist soil and abundant watering. Surprisingly, the flower colour changes with soil pH.

Flowering season

JanFebMarAprMayJunJulAugSepOctNovDec

Practical tips

Watering

Water needs: alta — always check soil moisture before watering.

Position

Prefers mezz'ombra: provide the right light and rotate the plant for even growth.

Substrate

Recommended soil: acido umido. Refresh the substrate every 1-2 years.

Leaves

Dust the leaves with a damp cloth to support photosynthesis.

Feeding

Feed during the growing season (spring-summer) and stop in winter.

FAQ

How do you change hydrangea flower colour?
On acidic soil (pH below 5.5) flowers turn blue; on alkaline soil (pH above 6.5) they turn pink. Use aluminium sulphate to acidify and get true blue.
When should I prune hydrangeas?
Prune in late winter, removing spent flower heads and the oldest stems: new blooms form on one-year wood, so don't cut everything down.

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