Knuckles cloud forest endemic flora: Strobilanthes (Nelu) gregarious flowering cycles?
What ecological triggers and honeybee swarming events accompany the synchronous 7-to-12 year mass flowering of Nelu shrubs across the Knuckles range?
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3 Answers from travellers
The Knuckles Conservation Forest is globally renowned for populations of Strobilanthes species (Nelu), encompassing over 30 endemic shrub varieties. Nelu exhibits monocarpic gregarious flowering, where entire mountainsides burst into vibrant purple and blue blossoms simultaneously once every 7 to 12 years. This massive nectar bonanza triggers massive reproductive swarming among giant rock bees (Apis dorsata), which migrate to the mountains to harvest nectar. Following seed set, the parent shrubs die back en masse, creating temporary dry fuel loads before seeds germinate rapidly across the forest floor.
Honey collected during a Nelu flowering season is prized in traditional Ayurvedic medicine for its distinct floral aroma and therapeutic properties.
Endemic birds like the Sri Lanka Whistling Thrush and Dull-blue Flycatcher experience high nesting success during Nelu flowering years due to abundant insect prey.
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