Soapwort: A Natural Cleaning Plant That Foams with Water

Scientific Identity

Soapwort's scientific name is Saponaria officinalis, part of the carnation family (Caryophyllaceae). Its name comes directly from this trait, it contains a compound called "saponin" that foams on contact with water. It's also known as "bouncing bet" in some English-speaking regions.

Permaculture Value

Soapwort is a good example of permaculture's self-sufficiency principle, offering a natural alternative to store-bought chemical cleaning products. It's an easy-growing perennial that needs little care once established. Its flowers also draw pollinators into the garden.

Edible / Medicinal Properties

The saponins it contains genuinely foam when mixed with water, and it's traditionally been used to wash delicate fabrics like wool and silk, and even for skin cleansing. An important note: this plant is not edible, saponin can be toxic in certain amounts, it's meant for external use only (as soap or foam), never to be swallowed.

How to Grow It

Soapwort grows easily in average soil, in sun or partial shade. It's relatively drought-tolerant and doesn't want excessive watering. Once established it can spread on its own, so it's worth keeping an eye on it if you don't want it wandering into places you don't want it.

From the Garden

We planted this both for its pretty flowers and to try it as a natural cleaning source. Rubbing the leaves and flowers with water really does produce foam, which surprised us the first time. I'd recommend anyone looking for an alternative to chemical products to give it a try.