How Large Will Penta Flowers Grow?


Pentas are blooming plants that are native to eastern Africa and the Arabian peninsula. The scientific name for these plants is Pentas lanceolata, but they are more often known as Egyptian star flowers. The height of a pentas plant is often less than three feet. Pentas are admired for their clusters of star-shaped blooms and are often grown as annuals, despite the fact that they are hardy in plant hardiness zones 10 and 11 according to the United States Department of Agriculture.


Plants of the genus Penta typically reach heights of between 2 and 3 feet, while the flower clusters average a width of approximately 4 inches.

Pentas Plant Height

According to the Missouri Botanical Garden, a wild pentas plant may grow to a height of between three and six feet when it is growing in its natural habitat. According to the University of Florida IFAS Extension, however, these plants are typically between two and three feet tall when grown in culture. The extension service also indicates that a pentas plant may be as broad as fifteen inches. The larger types of pentas, such as those in the Northern Lights series (Pentas lanceolata ‘Northern Lights’), often grow to a height of 2 feet and a width of 2 feet. The shorter Pentas lanceolata ‘Lucky Star’ pentas of the Lucky Star series (Pentas lanceolata ‘Lucky Star’) normally grow to a height of between 12 and 16 inches.

The flower clusters of a pentas plant are the most prominent feature of the plant. Each of these dainty blooms has five petals, giving rise to the plant’s common name, “pentas.” Each of the spherical bloom clusters on a single plant may have up to 15 to 20 individual flowers and is around 4 inches in width. Pentas flowers may have a variety of hues, including lilac, various shades of pink, and even white or red in certain situations. A pentas plant has leaves that are around 15 centimetres (6 inches) in length.

Growing Pentas Outdoors

According to the Texas A&M AgriLife Extension Service, the springtime is the optimal season to grow pentas. Plants may be started from seed inside in colder locations around two months before the final frost of the season. This gives the plants a head start. Pentas should be spaced between 18 and 24 inches apart when planted in order to give them sufficient room to grow. It is common knowledge that the presence of these plants in a garden can attract both hummingbirds and butterflies.

According to the Missouri Botanical Garden, while pentas may tolerate some shade, they will produce the most beautiful flowers when planted in settings that get full sun. Pentas need to have frequent waterings when they are initially planted, but after that, they should only be watered when there is not enough rain to keep the soil wet. According to the recommendations of the University of Florida IFAS Extension, you should apply a balanced fertiliser to your pentas plants every six weeks in order to maintain them looking and functioning at their best.

Pentas in Containers

Pentas are annual plants that are often used as bedding plants. They also perform quite well when grown in containers. If you live in an area that is not within the hardiness zone of pentas flowers, you have the option of growing them in pots and bringing them inside for the winter. The Missouri Botanical Garden recommends bringing a container-grown pentas plant inside before the first frost of the autumn and storing it in a room with temperatures ranging from 50 to 59 degrees Fahrenheit. This will let the plant to survive the winter. It is recommended that you cut down on watering at this time.

If you can provide pentas plants with a space that is sunny and humid throughout the year, you may also maintain them inside. Pentas flowers may be grown closer together in containers, such as pots, than they can in garden beds, according to research conducted by the University of Florida’s IFAS Extension. Because pentas thrive in a soil with a pH that is either neutral or slightly acidic, it is often essential to add dolomitic limestone to potting soil, which has a propensity to be on the acidic side of the pH scale.