Hydrangea 'White Knight'

Hydrangea 'White Knight'

Shining petals with dark stems.

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A very choice with large, classic white, mop top flower heads over deep green foliage. Part of the Obsidian Collection, the dark stems compliment the blooms and remain a handsome feature after the leaves fall. Flowering early in the season, from late spring, the blooms can remain a feature into autumn. A great choice for cut flowers.

This marvellous shrub has lush green foliage, mounding 90-120cm high but in containers it will be more compact. The flowers open on last season's growth so they should be pruned to a plump set of buds, after flowering, in winter.

Hydrangeas grow best planted in a sheltered position of the garden where the roots are cool and moist. It is a good idea to add plenty of organic matter or some fertiliser to the soil as it will result in masses of stunning blooms.

Hydrangea flowers are good for picking. To help make the flowers last longer, bring a bucket of water out with you to the garden, plunge them in as soon as you have cut the stem. Once you are inside, cut them again and hold them in hot, boiled water for 30 seconds before arranging in a vase.
You can manipulate the flower colour by adjusting the PH of the soil. Yates make it easy with Hydrangea Pinking Liquid (Lime/Dolomite) and Hydrangea Blueing Liquid (Aluminium sulphate). We recommend to have a soil pH level of below 5 (very acidic) to sustain the blue flowers, or 6.5 or higher (slightly acidic to alkaline) for the mauve pink option.

Supplied as: Pots
Size: 10 cm



Botantical name

Hydrangea macrophylla






Late spring to autumn


Cool to Sub-Tropical


Australia wide

Frost hardiness

Fully Hardy


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Supplied as



10 cm

Water needs