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Profile of the Egyptian Star Cluster Plant

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Pentas plants, semi-tropical shrubs, seem designed for butterflies. These nectar-rich flowers bloom in large clusters and are available in vibrant red, pink, or purple shades. They act as a beacon for butterflies. The butterfly proboscis can easily access clusters of shallow blooms, which allows them to dip into many flowers quickly. They are also popular with bees, so add this plant to your landscape to keep it busy.

The Rubiaceae family includes the genus Pentas and species lanceolata of the Pentas genus. This family also includes beloved ornamentals such as gardenias as well as plants that have economic significance like coffee. Pentas may be identified on plant tags with the common names star flower or Egyptian star flower. Pentas can be grown anywhere as an annual. In warmer zones, they may even become perennial.

How to Grow Egyptian Star Clusters

Pentas, a tropical import from East Africa, are wild-grown in East Africa. The plants are the perfect size to be placed in the middle of the summer border. They measure 24-36 inches tall, but can grow up to four feet if they are planted in frost-free areas. Pentas plants have dark green leaves that are slightly fuzzy. The five-petaled blooms grow in clusters of three inches, similar to Queen Anne’s Lace, lantana and sedum. The colors of the blossoms are pink, purple and red. Penta plants can remain in bloom for many years under the right growing conditions. It’s worth taking a little extra care to ensure that your plants are in peak condition.

Gardeners often choose pentas transplants to plant in their garden. However, you can also save last year’s flower seeds and start fresh pentas seeds or softwood cuttings early in the growing season. Penta seeds need light to germinate so don’t cover with soil.

Egyptian star flower, Egyptian Star Cluster
Egyptian star flower, Egyptian Star Cluster


The best Penta plants will bloom if they get at least three hours of sunlight per day. Plants that don’t get enough sunlight will become brittle and prone to becoming leggy. Even though they prefer full sunlight, some afternoon shade can be tolerated.


Pentas love a pH range between 6.0 and 7.0 in their soil. If your soil is too acidic, you can amend it with leaf mold or compost.


Regular irrigation is necessary for Pentas to remain healthy. Keep the soil moist as a sponge. Pentas can tolerate dry conditions but are more susceptible to spider mite infestations in drought-stressed areas. To prevent brown spots from appearing on the leaves, avoid frequent overhead watering.

Humidity and Temperature

Because of their tropical origin, Egyptian star-clusters thrive in hot climates and love heat.


Pentas should be fertilized once per month using a balanced fertilizer, during periods of active growing. These fertilizers can be used in a timed manner to nourish the plants all through the growing season. Higher levels of phosphorus will encourage bloom formation while higher levels of nitrogen will promote leafy growth.

Potting and repotting

Pentas love tubs and containers. However, pentas can thrive indoors in high-light conditions. Whiteflies can be a problem for indoor plants. You can bring plants indoors before the first frost or cut off desired varieties. Overwintering plants in a cool, bright room is possible in a place with good light. You can keep indoor plants healthy by providing additional light and increasing humidity by using a tray filled with gravel and water.


Pentas in frost-free zones will show their shrubby nature, and become leggy after one season. When bloom production is at its lowest, prune the plants to six inches in January. The stems of pentas can become so woody after several seasons that it may be worth replacing them entirely. If the pentas are grown as an annual, there is no need to prune, but it is important to deadhead regularly to keep them blooming.

There are many varieties to choose from

The new pentas cultivars are resistant to disease and come in dwarf forms that can be used for borders and containers. Gardeners looking to fill large flowerbeds on a tight budget can grow the ‘Butterfly series from seeds. The ‘Graffiti series has compact mounding plants and large flower heads. The ‘Kaleidoscope appleblossom’ pentas have pale pink and rose flowers. The ‘New Look” series produces upright plants that won’t fail in areas with rain. If you have a short growing season, the ‘Northern Lights series will continue to produce pale lavender flowers even in cold temperatures.

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