How to Grow Ruellia - Planting & Caring

By Sharon & Team   /   Shrubs Category   /   2023

Ruellia, commonly known as ruellia or wild petunia, is a genus of flowering plants in the family Acanthaceae. The genus is named after the French botanist Jean Ruel. It contains about 250 species, native to tropical and subtropical regions of the Americas.

How to Grow Ruellia - Planting & Caring

Growing Easiness

Is it easy to grow Ruellia plant? Although some ruellias are difficult to grow, most are quite easy. They prefer full sun but will tolerate some shade. They like a well-drained soil that is not too dry. Ruellias can be propagated by seed or by division of the rootball.

Plant Size

How big can it be? Since they are a fast-growing plant, they can reach up to 25 cm in height. However, if the shoots are not supported, they will eventually lodge (fall over).

Growth Rate

How fast is the growth? So, in the first year of life the plant is low, not exceeding 20 cm in height. In the second year, the height of the plant can reach up to 1 m.

Ruellia Basic Knowledge

Plant Form Shrub
Family Acanthaceae
Origin Brazil

Lifespan, Perennial or Annuals

How long is the lifespan? The reason you might want to rejuvenate Ruellia from cuttings is because as the plant ages, the lower parts of the shoots become bare. If you have an older Ruellia plant, you can take cuttings from the plant to propagate new plants. These new plants will have the same genetic makeup as the parent plant, so they will also live for a long time.

Ideal Temperature

What is the ideal temperature? Common ruellia (Ruellia simplicifolia) is a heat-loving plant, in the summer it is preferable not to allow the temperature to rise above + 25 ° C during the day and + 18-20 ° C at night. With a sharp drop in temperature, the leaves of the plant fall off.


What about the humidity? Common ruellia (Ruellia simplex), also known as Mexican petunia or wild petunia, is a herbaceous perennial that is often used as a bedding plant or in mass plantings. It grows 12-24 inches tall and 12-18 inches wide, with purple or lavender flowers that bloom from summer to fall. This plant is tolerant of poor soil, heat and drought, but it does best in moist, well-drained soil with regular watering. It is also tolerant of salt spray, making it a good choice for coastal gardens.

Light Requirement

What amount of light this plant needed? The Ruellia plant does best with bright, diffused light. The southern window is best suited for this plant, but it should be shaded. The east and west windows are also good choices for the Ruellia plant.

Soil Composition

What is good soil for Ruellia? Since Ruellia is a native plant to tropical and subtropical areas, it grows best in soil that is rich in organic matter and drains well. A good potting mix for Ruellia contains 1 part of the garden land, 2 parts of leaf land, and 1 part each of coarse sand or perlite and peat. Heavy clay soils are contraindicated for Ruellia because they do not drain well. Good drainage is required for Ruellia to prevent root rot. Always use a pot with an opening at the bottom for drainage when growing Ruellia.

Watering Time

How much I must water Ruellia? known as the Mexican petunia or the wild petunia, is a genus of flowering plants in the family Acanthaceae. The species Ruellia simplex is commonly cultivated as a ornamental plant. These herbaceous plants are native to the American tropics, where they are found from the southern United States to northern Argentina. The genus Ruellia contains about 200 species, many of which are used as ornamental plants. The Mexican petunia is a fast-growing, herbaceous perennial that blooms throughout the summer. The plant typically grows to a height of 1-3 feet and produces purple or white flowers. Mexican petunias are tolerant of a wide range of soil types and prefer full sun to partial shade.

Fertilizing and Nutritient

About fertilizer. Because this plant is a heavy feeder, it's important to fertilize it regularly. I like to use a liquid fertilizer every 2-3 weeks at half the recommended dose. This really seems to green up the leaves and keep the plant looking good.


How to reproduce Ruellia? Although Ruellia plants can be propagated by seeds, it is much easier to take cuttings from an already existing plant in the spring. The ideal cutting is 5-8 cm long with 2-3 knots. The cutting should be placed in moist sand with peat and then covered with a layer of polyethylene film. The temperature should be kept at 69.8 degrees Fahrenheit for the roots to appear. Once the Ruellia plant has rooted, it can be transferred to a small pot. For best results, the plant should be pinched at the top twice to encourage branching.


Why Ruellia won't bloom? Common ly called Mexican petunia or wild petunia, Ruellia is a genus of flowering plants in the family Acanthaceae. They are native to the Americas, where they are distributed from the southwestern United States south to Argentina. Many species are cultivated as ornamental plants for gardens and landscapes. They are especially valued for their ability to tolerates hot and humid conditions. Ruellia plant bloom in the summer with pink funnel-shaped flowers. They are a common sight in many gardens and landscapes in the southwestern United States.

Transfer or Repotting

How much I must water Ruellia? If your Ruellia has been growing in the same pot for a long time, it's probably time to transplant it. You'll want to do this every year in the spring. When you transplant, be sure to cut off any stretched-out shoots. You must be careful not to damage the fragile leaves. Also, be sure that there is good drainage.

Caring The Ruellia

How to care the plant? Common Ruellia (Ruellia brittonia) is an evergreen perennial that sports beautiful, trumpet-shaped blooms in shades of pink, purple, red or white from late spring until fall. It's easy to grow in any sunny spot and is a welcome addition to beds, borders, containers and mass plantings. Although common Ruellia is considered an annual in colder climates, it often returns in mild winters. Read on to learn more about how to care for common Ruellia. Ruellia plant care is pretty easy – just give it plenty of sun and well-drained soil and it will be happy. It's not too picky about soil type, but it doesn't like to stay wet, so make sure your planting spot has good drainage. Once it's established, common Ruellia is drought tolerant, so you don't have to worry about watering it regularly. Just water it during extended periods of drought. This plant doesn't need much fertilizer, but you can give it a light feeding in spring with a general purpose fertilizer before new growth begins. As far as pruning goes, you really only need to do it to shape the plant or to remove any dead or damaged stems. If you want to keep it compact, you can give it a light trimming after it blooms in late summer or early fall.

Pests & Challenges

What is the challenge when caring Ruellia plant? known as ruellia or ruellia tweediana. It is a flowering plant that can be found in the southern United States, Mexico, and South America. The plant is known for its showy, colorful flowers, which bloom in the summer and fall. The plant is also known for its ability to tolerate a wide range of growing conditions, including full sun, partial sun, and shade. The plant is also tolerant of a wide range of soils, including sand, loam, and clay. Ruellia is a fast-growing plant, and it can reach a height of up to 6 feet in just a few months. The plant is also known for its ability to spread quickly, and it can often be seen growing in large clumps.

Toxic & Poisonous Type

Are Ruellia poisonous? Since the Ruellia plant is toxic, it is advisable to keep it away from children and pets. The plant contains a compound called ruellin, which is known to be toxic to humans and animals. Symptoms of toxicity include nausea, vomiting, and diarrhea. In severe cases, Ruellia poisoning can lead to death.