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Guide to Growing Cassia Popcorn Plant in a Pot

Updated: April 25, 2022

Cassia popcorn plant, also known as Cassia fistula, is a beautiful flowering tree that originates from India, Sri Lanka, and Thailand. It is commonly grown in tropical and subtropical regions, but it can also be grown indoors in a pot. If you’re interested in growing this plant in your garden or indoors, here’s a guide to help you get started.

Choosing the Right Pot

When growing cassia popcorn plant in a pot, you need to choose the right size of the pot. A pot that is too small will restrict the growth of the plant, while one that is too large will make it difficult to control the growth. The best pot size for cassia popcorn plant is 12-16 inches in diameter and at least 10-12 inches deep with good drainage holes.

Preparing the Soil

Cassia popcorn plant grows well in well-draining soil that is rich in organic matter. You can prepare the soil by mixing equal parts of peat moss, perlite, and vermiculite. This soil mixture provides good drainage and aeration for the roots of the plant.

Planting the Cassia Popcorn Plant

Before planting your cassia popcorn plant, water it thoroughly to ensure that the roots are moist. Then, fill the pot with the prepared soil mixture and create a small hole in the center of the pot. Place the plant in the hole and gently cover it with soil. Water the plant again to settle the soil around the roots.

Watering and Fertilizing

Cassia popcorn plant needs regular watering to keep its soil moist but not waterlogged. Water it once or twice a week during the growing season and reduce watering during winter months. Fertilize your cassia popcorn plant every two weeks during spring and summer using a balanced fertilizer. You can reduce fertilization during fall and winter.


Pruning is important to maintain the shape and size of your cassia popcorn plant. You can prune your plant during spring or summer by removing dead or damaged branches. You can also trim the tips of the branches to encourage bushier growth.

Providing Adequate Lighting

Cassia popcorn plant needs plenty of sunlight to grow well. Place your pot in a sunny location where it can get at least six hours of direct sunlight every day. If you’re growing it indoors, place it near a south-facing window where it can get plenty of sunlight.

Common Problems and Solutions

  • Yellowing Leaves: This could be a sign of overwatering or poor drainage. Reduce watering and ensure that the soil is well-draining.
  • Pests: Cassia popcorn plant can be attacked by mealybugs, spider mites, and scale insects. Use an insecticide or neem oil to control the pests.
  • Dropping Leaves: This could be due to stress caused by lack of water or too much direct sunlight. Ensure that your plant is receiving adequate water and place it in a location with filtered sunlight.


Can cassia popcorn plant grow in cold climates?

No, cassia popcorn plant is a tropical tree that requires warm temperatures to grow well.

How often should I fertilize my cassia popcorn plant?

Fertilize your plant every two weeks during spring and summer, and reduce fertilization during fall and winter.

Can I grow cassia popcorn plant indoors?

Yes, you can grow this plant indoors in a pot as long as it receives adequate sunlight.

In conclusion, growing cassia popcorn plant in a pot is easy and rewarding. With proper care and attention, you can enjoy beautiful flowers and foliage from this tropical tree all year round.

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