{Chrysanthemum spp.}

Spotting a Boron Deficiency

Malformed petals due to quilling, a common symptom of boron deficiency.

Spotting a Boron Deficiency

Two small, quilled florets on the right.

Boron Deficiency in Chrysanthemum

In mild cases of boron deficiency, the petals fail to unroll properly and become “quilled." When the deficiency is severe, symptoms will also be seen in the leaves which will be brittle and closely spaced. Some down-curling of the leaves may occur and leaf tips may become chlorotic. There may be some loss of flower color. When the deficiency is acute, the buds fail to open properly and the death of the growing point will be followed by multiple shoot formation.

Soil Application (Suggested rates of application)

  Granubor 2 Fertibor
LBS./ACRE 3-13 3-13
KG/HA 3.38 - 14.63 3.38 - 14.63

Foliar Application (Suggested rates of application)

KG/HA 2.25 - 2.25
Value in Use
Application Method
Current Yield (Per Acre)
Expected Sale Price

Rio Tinto Borates is a global leader in the supply and science of borates - naturally-occurring minerals containing boron and other elements. Refined borates are essential nutrients for crops. We are 1,000 people serving 500 customers with over 1,700 delivery locations globally. We supply 30% of the world's need for refined borates from our world-class mine in Boron, California, about 100 miles east of Los Angeles.  Learn more about Rio Tinto

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