{Dianthus caryophyllus}

Spotting a Boron Deficiency

Boron deficient shoots on the right show curled leaves and abortive flower development

Spotting a Boron Deficiency

Curled leaves and poor flower development.

Boron Deficiency in Carnation

A high incidence of calyx splitting is usually the first sign of boron deficiency. The leaves split at the nodes and the flower buds abort. Where buds do not abort there will be few petals which dry off and the style will be pronounced. Red patches, which develop along the central veins on the lower leaves, later spread over the leaf and become necrotic. The leaves tend to be spoon shaped with serrated tips. The uppermost lateral shoots may have a “witch’s broom” appearance. Both total bloom production and the yield of marketable blooms can be increased by boron application. Where boron supply is marginal, liming can markedly increase calyx splitting in the absence of a boron supply in the liquid feed or fertilizer.

Soil Application (Suggested rates of application)

  Granubor 2 Fertibor
LBS./ACRE 6-13 6-13
KG/HA 6.75 - 14.63 6.75 - 14.63

Foliar Application (Suggested rates of application)

KG/HA 2.25 - 2.25

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