Cold Damage on hoya
What's Happening
Hoyas are tropical epiphytes that suffer physiological damage at temperatures below 55°F (12°C). Cold stress causes cellular collapse, manifesting as mushy, water-soaked leaf patches, sudden leaf drop, or 'transparent' leaves. Exposure to AC vents or cold windows during winter is the primary trigger.
How to Fix It
- 1
Move the Hoya immediately to a stable warm area (65-80°F)
- 2
Prune away any mushy or blackened tissue with sterilized shears to prevent rot spread
- 3
Do NOT water a cold-stressed Hoya until the soil is completely dry; cold roots are prone to rot
- 4
If the plant loses all leaves, check the vine; if the vine is still firm and green, it can push new growth from nodes
- 5
Provide high humidity (60%+) to support the plant while it recovers its metabolic rate
How to Prevent It
Never place Hoyas near exterior doors or drafty windows in winter. Keep plants at least 3 feet away from air conditioning vents. If shipping Hoyas in winter, always use 72-hour heat packs and insulated boxes.