Answer: I wish I knew the names of your plants. It would be really helpful to know exactly what they are so I can give you specific information on their growing requirements. Without knowing, I can only suggest that overwatering is the prime cause for leaf yellowing and dropping in tropical (house) plants. Drafts from air conditioning or heating vents can also cause leaf loss, as can direct sunshine (most tropical plants suitable for growing indoors do best in bright light but not direct sunlight). If you can have someone identify your plants for you and then submit another question giving us their names, we can help you solve the problem. Until then, water only after the top half-inch of soil dries out and keep your plants in a bright, draft-free location. I hope they recover!
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