Problem of curling leaves

Hong Kong, Hong Kong

Why are my leaves curling?

No bugs seen. Soil not too moist or dry. My guess is the lack of a type of nutrient. But, which nutrient?

Please help.

Thumbnail by sunflowerhk
Starkville, MS(Zone 8a)

Perhaps a lack of magnesium. Epsom salts will solve that, IF that's the problem.

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