Popcorn cassia is a delightful plant that blooms with golden yellow flowers during late summer and fall, making it a great addition to any garden. It can be grown as an annual or perennial and is easy to care for. Originally from Africa, this plant gets its common name from the buttered popcorn scent of its leaves when rubbed. Its colorful flowers attract insects, birds, and butterflies, but it is toxic to humans and pets. If you live in zones 9-11, you can grow popcorn cassia as a perennial or multi-stem shrub in full sun and well-draining soil. Give it enough space to expand and make sure to water it regularly until it is established. In colder climates, popcorn cassia will thrive as an easy-to-grow annual in containers. To plant popcorn cassia, wait until all danger of frost is past and dig a hole about 1.5 times as wide as the pot. Space plants two feet apart and stake them if you live in warmer climates where they are grown as perennials. Water regularly and keep the soil rich, moist, and well-drained with a neutral pH. Overall, popcorn cassia is an excellent plant choice for tropical and temperate landscapes, and its beautiful flowers and unique fragrance make it a welcome addition to any garden.
When it’s hot and humid outside, plants tend to grow at a faster pace and produce multiple leaves and flower stems. However, if the temperature drops below 80 degrees Fahrenheit, their growth rate significantly slows down. On the other hand, popcorn can handle a little bit of frost. If you live in a colder region, it’s best to transfer your plants indoors during winter and place them in a greenhouse or a bright window. Make sure to bring them inside when the nighttime temperatures reach the high 30s.
To ensure that the popcorn cassia plant grows to its full potential, it is essential to use rich and fertile soil. In case the soil is inadequate, adding organic matter and a balanced fertilizer a couple of times during the growing season can help. Pruning should only be done after this plant has bloomed. Light pruning can lead to more compact growth, but it might delay a repeat bloom. Popcorn cassia can grow well in containers, and it is crucial to choose a pot with large drainage holes that are 4 inches wider than the root system. Pebbles or rocks can also be added at the bottom for stability. These plants need frequent watering and fertilization when grown in containers. The popcorn cassia does not have any significant pests or disease issues, but poorly drained soil can lead to root rot. Propagation of this plant is possible through seeds or rooted cuttings. Popcorn cassia can be paired with other plants, such as Elephant’s ear, Dahlia, and Verbena, for an appealing contrast of colors and textures.
Do you have some questions in mind regarding popcorn cassia? Here are some frequently asked questions and their answers. One of the common concerns is whether popcorn cassia is invasive. The answer is no, but there is a similar-looking plant called Senna pendula var. glabrata that is considered invasive in central and south Florida. This plant can spread to wild areas and displace native species. To avoid confusion, it’s best to purchase popcorn cassia from a trusted nursery and double-check the plant tag to ensure it is the correct species, Senna didymobotrya. Another question people might have is whether popcorn cassia is edible. Unfortunately, it is not safe for consumption as it is toxic to both humans and pets.