Your ficus tree on a sun-blasted balcony will survive, but it's a rollercoaster:
Keep it permanently indoors in front of a bright window (east/west/south with sheer curtain). Stable light = stable foliage. No seasonal leaf storms. I've written a detailed Ficus care article—email wcreed@HorticulturalHelp.com for a copy.
Diagnosing Two Problem Trees: Borer and Canker
Aspen Leaf Spot: Fungal Disease in Colorado Springs
Diagnosing Leaf Drop in Ficus Trees
Ficus Tree Seasonal Leaf Drop: Normal Behavior and Care
Best Indoor Trees for a Warm Greenhouse in New York
Tree Recovery After Insecticide Burn
Why Beech Trees Keep Their Leaves in Winter: Understanding Marcescence
Princess Tree (Paulownia) Yellowing Leaves in Germany: Water, Borers, or Damage?
Lilac Leaf Curl and Bark Splotches: Herbicide Drift Suspected
Citrus Trees Not Fruiting: Light, Pests, and Nutrition
Tree Rose Failure: Green Trunk but No Growth After Two Months
Hibiscus Tree Care: Light, Fertilizer, and Pest Management for Blooms
Reviving a Declining Jasmine Tree: Light, Temperature, and Pruning
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