Why are the leaves turning yellow and falling off my hibiscus plant?

Question

The plant next to it is doing well.

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Answer 1

This cultivar may consume nutrients faster than normal. They are already very heavy feeders, requiring consistent fertilization. This article will give you more information on these: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/how-to-care-for-hibiscus-plants.htm