Heavenly bamboo was introduced to America in the early 1800s as an ornamental shrub; its red berries can poison birds as the shrub invades forests

Introduced to America as an ornamental plant in the early 1800s, heavenly bamboo has become a concern in parts of the country because of its ability to spread into natural areas and its toxic berries. Despite its name, Nandina domestica is not a true bamboo. Native to Asia, this evergreen shrub is grown for its foliage, seasonal flowers and clusters of red berries. However, it can establish itself beyond gardens, spread through vegetative growth and seeds dispersed by birds, and compete with native vegetation. Its berries contain high levels of cyanide and can poison birds and other animals. The shrub’s spread and toxicity have prompted the Missouri Department of Conservation to advise against planting it and recommend removing established plants.What is heavenly bamboo and why is it considered an invasive plant?Heavenly bamboo, also known as nandina or sacred bamboo, is an evergreen shrub in the barberry family. Native to Asia, it is cultivated for its upright stems, compound leaves and ornamental appearance. The plant typically grows about 3 to 7 feet tall, although its size can vary depending on growing conditions.Its leaves may change colour through the seasons, while its small pinkish-white flowers generally appear in early summer. These are followed by clusters of red berries that can remain on the plant from autumn into spring. The berries contribute to its ornamental appeal but are also a source of concern because of their toxicity. The shrub was introduced to the United States as an ornamental plant in the early 19th century. It has since become established in parts of the country, particularly in the Southeast, where it can grow outside cultivated settings and spread into forests and other natural habitats.How heavenly bamboo spreads into natural areasHeavenly bamboo can spread through vegetative growth and seed dispersal. Its roots can produce new shoots, while birds that eat the berries can carry seeds away from the parent plant. However, the relative importance of these methods is not settled across the available sources. The US Forest Service’s review of the species reports that seed reproduction may be more common than vegetative reproduction, although the prevalence of each method is not well documented. The Missouri Department of Conservation, meanwhile, highlights the plant’s ability to regrow from its roots. Both pathways can contribute to its spread, and established plants can be difficult to eradicate.Once established outside cultivation, heavenly bamboo can form dense growth that competes with native plants. Its persistent foliage can shade native wildflowers, while dense thickets can limit food sources for wildlife by displacing native vegetation. The shrub’s spread has been documented in Tennessee forests. The Missouri Department of Conservation reports that heavenly bamboo has covered about 10,000 acres of national forest lands in Tennessee alone. Separately, a US Forest Service species review estimates that the plant covered 9,237 acres in Tennessee forests, based on Forest Inventory and Analysis data dated March 15, 2008. The figures refer to different descriptions of the land covered and should not be treated as directly comparable estimates.Why the red berries can be dangerous to birdsThe Missouri Department of Conservation states that heavenly bamboo’s berries contain high levels of cyanide and can poison wild birds and other animals, including pets. The department documents deaths among cedar waxwings that gorge on the berries, particularly when other types of berries are scarce. The risk does not mean every bird that eats the fruit will be poisoned: the department notes that most birds consume only a few berries at a time and are largely unharmed.Birds also contribute to the shrub’s spread. After eating the fruit, they can deposit undigested seeds far from the parent plant, allowing heavenly bamboo to establish in new locations. This creates a potential double problem: heavy berry consumption can be dangerous to some birds, while seed dispersal can help the non-native shrub spread into natural habitats.Should heavenly bamboo be planted in gardens?The Missouri Department of Conservation advises against planting heavenly bamboo and recommends removing it where it is already growing. The department also notes that no human poisonings have been reported in its account. However, it identifies the plant as toxic and warns of risks to pets and livestock. Removing established plants can require attention to the roots, as regrowth may occur if even a small piece remains in the soil. According to the department, cutting down or burning the above-ground growth can result in resprouting. Control methods may include pulling seedlings, cutting, prescribed burning and herbicide treatments, depending on the situation.Gardeners looking for alternatives can consider native shrubs suited to their local conditions. The Missouri Department of Conservation recommends American beautyberry, Virginia sweet-spire, Carolina allspice, New Jersey tea, wahoo, black chokeberry, fragrant sumac and ninebark. Heavenly bamboo’s history shows how a plant introduced for its appearance can become a management concern outside cultivation. Its ability to spread, the difficulty of controlling established growth and documented bird deaths linked to heavy berry consumption have led the Missouri Department of Conservation to recommend avoiding the plant in favour of suitable native alternatives.You use AI every day. Now get your AI Quotient. Take the AIQ test.