How Much Space Does a Hibiscus Need?

Species Identification

• The genus hibiscus includes more than 200 species of plants, ranging in size from small trees to shrubs. This means a gardener must thoroughly understand what type of hibiscus is in her possession before planting. Some hibiscus may grow only 2 or 3 feet wide and tall, while others can reach a width and height of 20 feet or more.

Perennial Hibiscus

• Even varieties of hibiscus within a particular cultivar vary greatly in size, a fact that a gardener must consider when allotting proper space for the plant. The perennial Hibiscus moscheutos, called a rose mallow or marsh mallow due to its propensity to grow in the wild in swampy areas, includes cultivars that vary in height by several feet. The "Disco Belle" series grows to between 2 and 3 feet tall, while the "Southern Belle" version is normally more than 6 feet in height.

Rose of Sharon

• The shrub hibiscus (Hibiscus syriacus) is commonly referred to as a Rose-of-Sharon or Althea and may grow as tall as 12 feet, although it normally is seen in the 4-to-7-foot range with a spread of 6 to 8 feet. It is classified as either a shrub or a small tree, depending on the manner in which it is pruned and how tall it is permitted to grow. A deciduous shrub, it enjoys full sunshine or partial shade.

Tropical Hibiscus

• The tropical hibiscus (Hibiscus rosa-sinensis) is among the species most commonly planted in the U.S. due to its large, bright, showy flowers. The plant can grow to 15 feet or more, but typically maxes out in the 5-to-6-foot range. Consider those facts when determining how much space a hibiscus needs. Like all plants, the potential size of a hibiscus can be affected by environmental and cultural conditions, along with pest and disease problems.