Brown Spots on monstera deliciosa
What's Happening
Brown spots on Monstera deliciosa leaves arise from multiple distinct causes requiring differential diagnosis. MECHANICAL DAMAGE to tender new leaves during unfurling causes irregular brown patches with torn tissue—common when leaves contact pot edges, walls, or other plants. WATER DROPLET LENS BURN creates circular burn marks when water droplets on leaves magnify sunlight, especially in white-variegated sectors. FUNGAL/BACTERIAL SPOTS from overwatering present as water-soaked lesions that expand into brown spots with yellow halos, often in leaf centers. Each cause requires different prevention and treatment strategies.
How to Fix It
- 1
Identify the pattern: Torn/irregular patches = mechanical damage; Circular spots = lens burn; Water-soaked expanding spots = pathogen
- 2
For mechanical damage: Trim affected areas with sterile scissors; reposition plant away from contact points
- 3
For lens burn: Stop misting immediately; switch to humidity trays; trim damaged tissue
- 4
For suspected pathogens: Isolate plant, remove affected leaves, improve air circulation, allow soil to dry completely
- 5
If spots spread rapidly: Apply copper fungicide as preventive measure; repot in fresh sterile mix if soil is waterlogged
How to Prevent It
Handle new growth carefully—unfurled leaves are extremely tender for 2-3 weeks. Avoid misting; use pebble trays or humidifiers instead. Never leave water droplets on leaves in bright light. Maintain proper watering schedule—only when top 2-3 inches are dry. Space plants 12+ inches apart to prevent leaf contact damage. Water at soil level to avoid leaf wetting.
Related Problems
Same Problem on Other Plants
Go Deeper
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