How to Grow Pentas - Planting & Caring

By Sharon & Team   /   Bush Category   /   2023

Pentas, also called Egyptian star flower, is a heat-loving annual that produces an abundance of small, star-shaped flowers in shades of pink, red, lavender, and white. The Pentas plant is a popular choice for butterfly gardens because the flowers attract butterflies. Pentas is a low-maintenance plant that is easy to grow.

How to Grow Pentas - Planting & Caring

Growing Easiness

Is it easy to grow Pentas plant? Although Pentas is a plant that is difficult to grow, it is worth the effort. They are heat and drought tolerant, making them perfect for the summertime. They come in a variety of colors, including white, pink, red, and purple. Pentas are a great addition to any garden.

Plant Size

How big can it be? known for their clusters of long-lasting, brightly-colored flowers, Pentas (Pentas lanceolata) are popular annual bedding plants. They typically grow to be 50-70 cm in height, but can reach a height of up to 80 cm under ideal conditions. Pentas plants are relatively easy to care for, and will bloom continuously from spring until fall.

Growth Rate

How fast is the growth? Because they are native to tropical and subtropical regions, they like warm weather and lots of sun. They grow best in rich, moist soil that is well-drained. Pentas plants are fairly drought tolerant once they are established.

Pentas Basic Knowledge

Plant Form Bush
Family Rubiaceae
Origin Tropical, subtropical Africa, o.Madagaskar

Lifespan, Perennial or Annuals

How long is the lifespan? The plant is a perennial, but it will only last for 2-3 years. After that, it will need to be renewed with cuttings.

Ideal Temperature

What is the ideal temperature? The reason why the Pentas plant does best in moderate temperature is because too much heat will dry out the leaves and cause the shoots to become stretched and bare. However, if the temperature is too low, the plant will not be able to survive. The ideal temperature range for a Pentas plant is 68-77 degrees Fahrenheit in the summer and about 60.8 degrees Fahrenheit in the winter.


What about the humidity? Because this plant comes from Africa, it needs high humidity to feel at home. The ideal room humidity for a Pentas plant is 60%. If the room you keep your Pentas in is particularly dry, increase the humidity by regular spraying with soft water or by placing the pot on a tray filled with wet kermasite, pebbles, or peat.

Light Requirement

What amount of light this plant needed? When it comes to lighting, a sunny spot that gets at least four hours of direct sunlight each day is ideal for a pentas plant. However, during the hot midday hours, the pentas plant will need to be shaded to prevent too much light and heat exposure. Light is essential for pentas plants to flower and to maintain a compact shape.

Soil Composition

What is good soil for Pentas? The Pentas plant does best in rich humus soils that are well permeable with a pH of 5.5 to 6.5. If you are preparing the soil yourself, mix 2 parts leaf, 2 parts turf soil, and 1 part coarse sand. The Pentas plant is intolerant of soil silt, so make sure there is very good drainage.

Watering Time

How much I must water Pentas? Eventually, the Pentas will need to be watered abundantly so that the soil seeps out of the pot and into the pan. However, it's important to make sure the soil dries out in between waterings. The rest period between waterings should be no more than 6-8 days, and approximately 1-2 days after the top layer of the soil has dried.

Fertilizing and Nutritient

About fertilizer. The best time to fertilize is from spring to autumn every two weeks. The fertilizer should have an increased nitrogen content. Pentas does not like the high content of salts in the soil.


How to reproduce Pentas? If you want to grow a Pentas plant from a stem cutting, do so in the spring when the soil temperature is 60.8 to 64.4 degrees Fahrenheit. Put the cutting in a mini-greenhouse and keep it moist. It should take 8 to 10 days for roots to form. Once the roots are established, transplant the cutting to a 7-cm pot. Water it generously. Once the roots fill the pot, transplant to a 9-cm pot. You can propagate Pentas seeds throughout the year. Just sow the seeds on the surface of a moist substrate, making sure not to bury them. Keep the seeds at a temperature of 73.4 to 78.8 degrees Fahrenheit and in the light, and they should sprout in 2 to 3 weeks. After 4 to 6 weeks, thin out the seedlings and transplant the strongest ones to 9- to 11-cm pots. If you want to grow Pentas as an annual crop, sow the seeds in January. The plant will bloom from May to June.


Why Pentas won't bloom? When the temperature outside begins to cool in autumn, the pentas plant will bloom pink, purple, and red flowers with a narrow corolla and a five-bladed arch.

Transfer or Repotting

How much I must water Pentas? The reason you need to transfer your plant every few years is because as it grows, it will need more room for its roots. When you first get your plant, it is probably in a small pot. You will need to transfer it to a larger pot once it outgrows its first pot. You can tell it is time to transfer your plant when you see roots coming out of the bottom of the pot. When you transfer your plant, you should also add new soil to the pot. You only need to add new soil to the top layer of the pot.

Caring The Pentas

How to care the plant? Unless you want your Pentas to become a leggy, sprawling mess, you'll need to pinch it back. Pinching means using your fingers or scissors to remove the growing tips of the plant. This forces the plant to branch out, making it fuller and bushier. You can pinch Pentas anytime it's actively growing, which in most cases is from late spring until early fall.

Pests & Challenges

What is the challenge when caring Pentas plant? The reason is because it is affected by so many things like spider mites, whiteflies, and aphids. Another reason is that the roots can rot in winter. Then, to make matters worse, Pentas stretch in low light. And, if that were not enough, the leaves turn yellow with insufficient watering, lack of nitrogen or iron.

Toxic & Poisonous Type

Are Pentas poisonous? If a person or animal ingests any part of a pentas plant, it can be toxic. The plant contains a chemical called pyrrolizidine alkaloids, which can cause liver damage.Symptoms of pentas plant poisoning include vomiting, diarrhea, and abdominal pain. If you think you or your pet has ingested a pentas plant, call your doctor or veterinarian immediately.