A 15"x15" grow bag should be suitable for a hibiscus plant. Hibiscus roots like room to spread out but don't typically require a very deep container. This size should provide ample space for the roots to grow and support a healthy plant, as long as you ensure good soil, proper watering, and adequate sunlight. Remember, hibiscus plants thrive in well-draining soil and need regular fertilization during the growing season.
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