Spiderwort is a surprisingly versatile plant with uses ranging from food to folk medicine to environmental monitoring. Native to the Americas, plants in the Tradescantia genus have been valued by indigenous peoples for centuries and continue to attract scientific interest for their antioxidant compounds, antibacterial properties, and even their ability to detect radiation and chemical pollutants.
A Fully Edible Plant
One of the most practical things spiderwort is good for is eating. The flowers, stems, and leaves are all edible, either raw in salads or cooked as a culinary herb. The vivid purple flowers, which last only a single day before wilting, can be candied with sugar for desserts or used as a cake topping. The flavor is mild, making it easy to work into dishes without overpowering other ingredients. The leaves have traditionally been cooked into soups, and the roots brewed into teas.
Traditional Medicinal Uses
Indigenous peoples of the Americas used spiderwort for a wide range of medicinal purposes long before European contact. One common application was treating spider bites, which some historians believe is actually the origin of the plant’s name. The roots were typically prepared as teas, while the leaves were cooked into broths and soups intended as remedies. Though detailed records of every traditional preparation are limited, the plant was broadly valued for what Michigan State University researchers describe as “numerous medicinal gifts.”
Antioxidant and Antibacterial Properties
Modern lab studies have begun to validate some of the plant’s traditional reputation. Researchers have identified a rich phytochemical profile across Tradescantia species, including flavonoids, phenolics, tannins, saponins, alkaloids, and terpenoids. These compounds have demonstrated antioxidant, anti-inflammatory, and antimicrobial activity in laboratory settings.
One species in particular, Tradescantia zebrina (the popular striped houseplant sometimes called wandering jew), has shown notable antibacterial strength. In a study published in the journal Antioxidants, its leaf extract fought off six species of bacteria that are typically harder to kill, including MRSA and Bacillus cereus. The same species has also shown activity against the pathway involved in asthmatic inflammation and has demonstrated insecticidal properties. These findings are still at the lab stage, not tested in human clinical trials, but they help explain why the plant has such a long history of medicinal use.
A Living Pollution Detector
Spiderwort has one use that no other common garden plant can match: it works as a biological early warning system for radiation and chemical pollution. Certain Tradescantia varieties carry a genetic trait where their stamen hairs are normally blue but mutate to pink when exposed to radiation or chemical mutagens. The more exposure, the more pink cells appear, giving researchers a visible, countable measure of contamination.
This system is sensitive enough to detect the low levels of exposure that human populations actually encounter in daily life, making it far more practical than systems designed only for high-dose scenarios. Scientists have used it both in controlled laboratory experiments and for on-site environmental monitoring near industrial facilities and nuclear plants. Simplified scoring methods now allow researchers to process large samples with high statistical accuracy, making the “Tradescantia stamen-hair assay” one of the most respected plant-based tools in environmental science.
Pollinator Support in Gardens
For gardeners, spiderwort’s ecological value is a major draw. Both common species found in North America attract native pollinators and beneficial insects, and smooth spiderwort specifically serves as a larval host for some native insect species. Because the flowers open fresh each morning and close by afternoon, they provide a reliable daily food source for bees during the bloom period. Clemson Cooperative Extension recommends planting spiderwort as part of pollinator gardens or naturalized plantings, noting that the delicate flowers work well in a variety of garden styles.
Spiderwort is also low-maintenance and spreads readily, which makes it useful for filling in bare spots, stabilizing soil in partially shaded areas, and creating ground cover where fussier plants struggle.
Safety for People and Pets
Spiderwort is generally safe for humans to handle and eat. However, the sap of some Tradescantia species can cause skin irritation in sensitive individuals, producing redness, itching, or a mild rash. This reaction sometimes takes hours to appear after contact. For pets, the picture is more mixed. Some Tradescantia species, particularly the ornamental indoor varieties like T. zebrina, contain compounds that can irritate a dog’s or cat’s skin and digestive tract if chewed on or eaten in quantity. Symptoms in pets typically include drooling, mouth irritation, and mild gastrointestinal upset. The native outdoor species like T. virginiana are not considered seriously toxic, but keeping curious pets from grazing on any houseplant variety is a reasonable precaution.