Persian Shield: Complete Growing & Care Guide

persian shield


Plant Type: Evergreen perennial
Family: Acanthaceae
Sun Exposure: Full to partial shade
Watering: Moderate
Colors: Purple, blue and silver
Size: 3-4 feet tall, 2-3 feet wide
Hardiness Zones: 8-11
Soil Type: Rich and moist
Soil pH: 5.5-7.5
Propagation: Seed or cuttings
Toxicity: Toxic to animals, unknown to humans

Persian Shield (Strobilanthes dyerianus) is a stunning tropical plant known for its iridescent purple color and silver foliage. Proper care and maintenance are vital for cultivating a healthy, thriving specimen in your home or garden.

In this comprehensive guide, we’ll delve into the history, characteristics, and ideal growing conditions of the Persian Shield plant. We’ll also provide expert advice on planting, propagating, watering, fertilizing, pruning, and protecting your Persian Shield from pests and diseases.

With the right knowledge and techniques, you’ll be well-equipped to enjoy the beauty and charm of this exotic foliage plant. 

Persian Shield Overview

Persian Shield

The Persian Shield (Strobilanthes dyerianus) is an exotic flowering plant in the family Acanthaceae. Native to Southeast Asia, this evergreen shrub thrives in warm, humid conditions and is commonly found as ground cover in dappled shade on rainforest floors. Its striking purple, lilac, and silvery foliage make it an attractive addition to gardens and indoor plant collections.

Capable of growing up to 4 feet tall and 3 feet wide, Persian Shield has a bushy habit. While it is an evergreen perennial in the tropics, it is often grown as an annual or an indoor plant in colder areas. It grows best in part shade to shade and requires rich, moist soil for optimal growth.

This exotic beauty prefers partially shady spots, with a full day of dappled light or around 4 hours of direct sun per day. However, it can adapt well to full sun in cooler regions where sunlight is less intense. As a warm-weather foliage plant, Persian Shield is often used as an indoor or hedging plant, offering both color and texture to the landscape.

When planting,, it is common to use potted nursery starts in spring after the soil has fully warmed. It grows relatively fast in suitable conditions; a small potted nursery plant can become a bushy 2-foot plant within just a few weeks.


Persian Shield, native to Southeast Asia, is an exotic evergreen shrub with vibrant foliage. It thrives in warm, humid conditions, growing up to 4 feet tall. Suitable for gardens, indoor collections, and hedges, it prefers partial shade and moist soil.

Growing the Persian Shield 

Persian Shield

Optimal Soil Requirements

Persian Shield plants flourish in neutral pH soil, typically ranging from 5.5 to 7.5, and can also tolerate slightly acidic conditions. For best results, provide your plant with rich, well-draining soil that retains moisture. Adding organic matter, such as compost, can enhance soil quality and ensure a nutrient-rich environment for your plant.

Balancing Sunlight and Temperature

Striking the right balance of sunlight is essential for these exotic plants. While they prefer part shade to full shade, exposing them to some morning sunlight can intensify their brilliant foliage. Be cautious of direct afternoon sunlight, as it may lead to leaf scorch. Persian Shields thrive in warm temperatures and are hardy in USDA zones 8 to 11. Gardeners in cooler climates can grow them as summer annuals or as houseplants indoors.

Consistent Watering and Humidity Management

Persian Shield plants demand regular watering to prevent wilting. It’s crucial to keep the soil consistently moist, but be mindful of proper drainage to avoid root rot, so keep the soil moist but not soggy. In terms of humidity, Strobilanthes dyerianus relish in humid environments. To maintain adequate humidity for indoor plants, place the plant on a tray filled with pebbles and water, or use a humidifier to create an optimal atmosphere. This will promote lush, healthy growth and enhance the stunning colors of your plant.


Persian Shield plants require neutral pH soil, part shade, and regular watering. They thrive in warm temperatures and high humidity. For optimal growth, use well-draining, moist soil, and manage sunlight exposure. In cooler climates, they can be grown as annuals or indoors.

Planting and Propagation

Strobilanthes dyerianus

This exotic beauty is a hardy plant that adds vibrant colors to any garden. In this section, we will discuss the proper techniques for planting and propagating this striking plant.

Starting from Seeds

Although Persian Shield can be grown from seeds, it is not the most common method, as seeds can be difficult to find and germinate. If you manage to acquire seeds, follow these steps:

  • Begin by sowing the seeds indoors about 8 to 10 weeks before the last expected frost.
  • Plant the seeds in a well-draining, organically-rich soil mix, covering them lightly with the soil.
  • Maintain a consistent temperature of around 70°F to encourage germination.
  • Keep the soil consistently moist, but not overly wet, throughout the germination process, which can take up to three weeks.
  • Once the seedlings have developed at least two sets of true leaves, transplant them to individual pots.
  • Gradually acclimate the seedlings to outdoor conditions before planting them in the garden in spring when the temperatures are consistently above 50°F.

Stem Cuttings

Taking stem cuttings is a more common and reliable method for propagating Persian Shield plants. Follow these simple steps to successfully root stem cuttings:

  • Choose healthy, vigorous stems, and cut 4 to 6-inch sections, cutting just below a leaf node.
  • Remove the lower leaves from the cutting, leaving just the top few leaves intact.
  • Dip the cut end in rooting hormone, which can help improve the chances of successful rooting.
  • Prepare a container filled with well-draining, organically-rich soil.
  • Make a small hole in the soil, insert the cutting, and firm the soil around the stem to help provide support.
  • Maintain consistent moisture in the soil, keeping it evenly moist but not overly wet.
  • Place the container in a bright, indirect light, and provide warmth to encourage root development.
  • Once the cuttings have rooted, which typically takes between 4 to 6 weeks, gradually adjust them to outdoor conditions and plant them in your garden.


Persian Shield propagation involves either seeds or stem cuttings. Seed germination is less common due to difficulty acquiring seeds and slow germination. Stem cuttings, a more reliable method, require healthy stems, rooting hormone, organically-rich soil, consistent moisture, and indirect light to root successfully within 4-6 weeks.

Persian Shield Care and Maintenance

Persian Shield

To keep your Persian Shield plant healthy, follow these care instructions.


Fertilization is crucial to maintaining the vibrant color and overall health of these exotic plants, especially those planted in containers. The use of a balanced, water-soluble fertilizer is recommended. Fertilize every 4-6 weeks during the growing season to provide the necessary nutrients for optimum growth.

Pruning and Pinching Back

Pruning and pinching back are essential to maintain a compact, bushy shape and promote new growth. Pinch back the stems regularly to encourage a fuller, more dense appearance. If your plant becomes leggy or loses some of its lower leaves, trim back the stems by up to a third to promote new growth.

Dealing with Pests and Diseases

While Persian Shield plants are relatively resistant to pests and diseases, there are a few issues to be aware of. These include:

  • Spider mites: Small arachnids that can cause damage to the leaves of your iridescent purple plant. If you notice signs of infestation, treat with insecticidal soap or neem oil.
  • Whiteflies: These tiny insects can cause damage by sucking sap from the leaves. Use a strong stream of water to dislodge them or use an insecticidal soap to combat the problem.
  • Fungal diseases: Maintain proper watering practices and airflow around your Persian Shield plant to avoid diseases such as root rot and leaf spot. If you see signs of disease, remove the affected leaves and treat the plant with an appropriate fungicide.


Ensure Persian Shield health by fertilizing every 4-6 weeks, pruning and pinching back for bushiness, and managing pests and diseases. Address spider mites and whiteflies with insecticidal soap or neem oil, and prevent fungal diseases with proper watering and airflow.

Common Issues and Solutions


Leaf Curling and Fading Color

Persian Shield plants may occasionally face some common issues, such as leaf curling and fading color. These problems can be a result of poor lighting, soil conditions, or inadequate watering. To address leaf curling, ensure your plant is getting enough indirect sunlight. If the fading color persists, consider transferring your purple plant to a brighter spot.

In addition, ensure that the soil is well-draining and amended with the appropriate nutrients, such as compost and perlite. Regularly check your plant’s moisture levels, and adjust your watering schedule as needed to avoid over- or under-watering.

Persian Shield Drooping and Wilting

Drooping and wilting are other common issues faced by Persian Shield plants. These symptoms are often a result of inconsistent or inadequate watering, as well as poor soil conditions. To prevent drooping and wilting, maintain a consistent watering schedule, and ensure the soil is moist but not soggy.

If you notice that your plant’s soil drains too quickly, consider adding more compost, peat moss, or coconut coir to improve moisture retention. Conversely, if the soil seems heavy and clay-like, amend it with sand to increase drainage.

Safety For Pets 

There is some question as to whether Persian shield is poisonous.  Some sites say it is poisonous to dogs, cats, and livestock.  The tubers and roots are listed as especially toxic.  However, Persian shield is not on the ASPCA’s list of poisonous plants.  You should not allow your pets to eat this plant, just in case. 


Leaf curling, fading color, drooping, and wilting in Persian Shield plants may result from poor lighting, soil conditions, or watering. Ensure indirect sunlight, well-draining soil, and consistent moisture. Amend soil with appropriate nutrients and adjust watering as needed.

A Visually Striking Plant…

Persian Shield is a striking plant that adds vibrant color to your garden or indoor space. By providing proper care, you can cultivate a healthy and thriving plant. So, go ahead and grow your own iridescent purple plant to enhance your surroundings with its exotic beauty!

Frequently Asked Questions

Can Persian Shield take full sun?

Persian Shield (Strobilanthes dyerianus) can tolerate some sun, but it’s not ideal for them to be in full sun. They grow best in part shade to full shade conditions. Exposing them to full sun, especially during the hot afternoon hours, can cause leaf scorch and may damage their beautiful iridescent foliage. Providing some morning sunlight can help enhance the vibrancy of their leaves, but it’s essential to protect them from harsh direct sunlight in the afternoon.

Does Persian Shield come back every year?

Persian Shield is a perennial plant in tropical and subtropical regions where the climate is consistently warm, such as USDA hardiness zones 8 to 11. In these areas, the Persian Shield will come back every year.

However, in cooler climates where temperatures fall below freezing, Persian Shield may not survive the winter outdoors. Gardeners in these regions can grow Persian Shield as an annual, or they can bring the plant indoors during the winter months to protect it from the cold. If you choose to overwinter your Persian Shield indoors, place it near a bright window with indirect sunlight and maintain its preferred temperature and humidity conditions. This way, you can enjoy its stunning foliage year-round.

How far apart do you plant Persian shield?

When planting Persian Shield, it’s important to give them enough space to grow and spread out. The mature size of a Persian Shield plant is typically 3 to 4 feet tall and 2 to 3 feet wide. To accommodate their growth and ensure proper air circulation, plant Persian Shield seedlings or cuttings approximately 2 to 3 feet apart from each other. This spacing will allow the plants to develop a healthy root system, maintain their shape, and prevent overcrowding, which can lead to pest and disease issues.

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