Whether you grow hibiscus in the ground or in a pot, the plant needs well-drained but moist soil. Plant outdoor hibiscus in soil high in organic matter and amend the site with a 2-inch layer of compost before planting to help improve it. Soil with a pH near 6.8 provides for the best growth. Use a jungle soil potting mixture or other potting soil formulated for tropical plants in pots. Use a pot that has at least one bottom drainage hole so excess moisture doesn't lead to root rot. Potted plants require repotting into a pot one size larger when the roots fill the old container. Plant hibiscus or place pots in a location that receives all-day sunlight. Outdoor plants can tolerate light afternoon shade in hot climates.