Dormancy Leaf Drop on oxalis triangularis
What's Happening
Oxalis triangularis exhibits nyctinastic movement (sleep movements) regulated by circadian clock genes, hormones (auxin), and Ca2+ signaling pathways. This daily folding of leaves is a normal physiological response, not a sign of distress. During dormancy periods (typically triggered by reduced light or temperature), the plant enters a rest phase where leaves yellow and drop as energy redirects to the underground corms. Confusion arises when owners mistake natural dormancy for plant death.
How to Fix It
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1. Verify dormancy vs death: Check corms (underground bulbs) - firm corms indicate healthy dormancy, mushy corms indicate rot
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2. Reduce watering to monthly during dormancy; never allow soil to completely dry for extended periods
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3. Maintain bright indirect light even during leafless phase to support corm metabolism
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4. Resume normal watering when new growth emerges (usually 4-8 weeks)
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5. Fertilize at 1/4 strength only when 3+ new leaves have unfurled
How to Prevent It
Maintain consistent 12-14 hour photoperiod year-round; provide 6-8 hours bright indirect light daily; keep temperatures above 15°C (59°F) to minimize forced dormancy; allow natural dormancy in autumn by reducing water gradually over 2 weeks.