Fasciation and Witches' Broom: Growth Anomalies Explained

Professional Gardener's Observation

Central CA: Citrus, francoa, Asiatic lilies show fused, flattened stems, distorted leaves, multiplied flowers. "Freaky, like celosia." Suspected mites, then read article calling it a "phenomenon, not disease."

Identification: Fasciation / Fasciculation

• Fasciation: Flattened, ribbon-like, fused stems (cristate growth).
• Fasciculation: Dense clusters of shoots (witches' broom).
• Causes: Genetic mutation, hormonal imbalance, microbial (viruses, phytoplasmas, mycoplasmas), mite feeding, physical damage.
• Often random, non-recurring.

Diagnostic Reality

Requires electron microscopy (1000s×) to see viruses/phytoplasmas. Field ID = descriptive only.

Management

• If cosmetic + plant healthy → enjoy the oddity.
• If spreading/declining → remove affected parts, sanitize tools.
• No chemical "cure" for genetic/microbial causes.
• Propagate normal growth if desired.

Nature's surreal art. Document it — you may never see it again.