Soapwort, Bouncingbet

Saponaria officinalis

Physical Characteristics

Saponaria officinalis is a PERENNIAL growing to 1 m (3ft 3in) by 1 m (3ft 3in) at a medium rate. See above for USDA hardiness. It is hardy to UK zone 4 and is not frost tender. It is in flower from July to September, and the seeds ripen from August to September. The species is hermaphrodite (has both male and female organs) and is pollinated by Lepidoptera (Moths & Butterflies). It is noted for attracting wildlife. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

Distribution

Europe, including Britain, from Scandanavia south and east to Spain and temperate Asia.

Habitats

Woodland Garden Sunny Edge; Dappled Shade; Ground Cover; Meadow; Hedgerow;

Edible Uses

None known

Medicinal Uses

Alterative Antipruritic Antirheumatic Antiscrophulatic Cholagogue Cytotoxic Depurative Diaphoretic Diuretic Expectorant Purgative Skin Sternutatory Tonic Soapwort's main medicinal use is as an expectorant. Its strongly irritant action within the gut is thought to stimulate the cough reflex and increase the production of a more fluid mucus within the respiratory passages[254]. The whole plant, but especially the root, is alterative, antiscrophulatic, cholagogue, depurative, diaphoretic, mildly diuretic, expectorant, purgative, sternutatory and tonic[4, 7, 9, 13, 21, 218]. A decoction of the whole plant can be applied externally to treat itchy skin[4, 201, 238]. The plant has proved of use in the treatment of jaundice and other visceral obstructions[4], but is rarely used internally in modern herbalism due to its irritant effect on the digestive system[238]. When taken in excess, it destroys red blood cells and causes paralysis of the vasomotor centre[238]. See also the notes above on toxicity[4, 7]. The root is harvested in the spring and can be dried for later use[7]. One of the saponins in this plant is proving of interest in the treatment of cancer, it is cytotoxic to the Walker Carcinoma in vitro[218]. The German Commission E Monographs, a therapeutic guide to herbal medicine, approve Saponaria officinalis Soapwort. Bouncingbet for coughs/bronchitis (see [302] for critics of commission E).

Known Hazards

The plant contains saponins[13]. Although toxic, these substances are very poorly absorbed by the body and so tend to pass through without causing harm. They are also broken down by thorough cooking. Saponins are found in many plants, including several that are often used for food, such as certain beans. It is advisable not to eat large quantities of food that contain saponins. Saponins are much more toxic to some creatures, such as fish, and hunting tribes have traditionally put large quantities of them in streams, lakes etc in order to stupefy or kill the fish[K]. Do not use for more than 2 weeks. Avoid during pregnancy.