How Do You Get Rid of Soapwort

To reduce spread by seed remove all flowers as soon as they appear or at least before seed set. The woody rhizome of the plants makes pulling it out of the soil difficult so a trowel or shovel may be necessary to remove them. In severe cases use a nonselective herbicide such as glyphosate (think Roundup) in spring.

Are soapwort roots invasive?

Soapwort can become invasive spreading by underground rhizomes. Unless you are harvesting the roots to make soap, it is recommended that you plant soapwort either in containers or use barriers around the plants to prevent the rhizomes from spreading. … Making soap with soapwort is very easy.

Can soapwort be cut back?

If you do not want it to invade other areas of your garden, trim back blooms to keep the soapwort from continuing to sow itself and spread. Soapwort does well over winter months. You can cut back the plant if desired, but it is not necessary. Cover the plants with mulch to protect the roots in the colder months.