In the study’s screening results, some extracts of *Pomaderris kumeraho* were antimicrobial against *Staphylococcus aureus* and *Bacillus cereus* at a minimum inhibitory concentration of 500 µg/mL. The paper therefore reports antibacterial activity for this species rather than no antibacterial effect.

While studying the antimicrobial properties of kūmarahou, we isolated a new strain of *Pseudomonas fluorescens*, which we designated KF1. The article explicitly frames the plant as being investigated for antimicrobial properties, but the bacterium was isolated from the plant material, not shown to be killed by the plant.

Kūmarahou is described as a plant with a high saponin content, and the page states that saponins exhibit strong antimicrobial activity. The same page says the plant's high saponin content provides strong antimicrobial action and that saponins are active against fungi associated with dandruff.

While investigating the antimicrobial properties of this plant, we found a new strain that we subsequently identified as the Gram-negative bacterium *Pseudomonas fluorescens*. The paper confirms the plant was being investigated for antimicrobial activity.

The same article, archived in an institutional repository, states: "Some of the extracts of Phormium tenax, Schefflera digitata, and **Pomaderris kumeraho** were antimicrobial against **S. aureus** and **B. cereus** (MIC = 500 µg/mL)."[7] This is a primary experimental study demonstrating antibacterial activity of Pomaderris kumeraho extracts against specific bacteria, using minimum inhibitory concentration assays.

The page lists kūmarahou’s actions as including 'Antimicrobial' and 'Antiseptic.' It also says the plant has a healing effect on the lungs and describes it as an immensely respected plant with a range of health uses.

The article discusses antimicrobial properties of medicinal plants and reports that some extracts of *Pomaderris kumeraho* were antimicrobial against *S. aureus* and *B. cereus* (MIC = 500 µg/mL). This is direct evidence of antibacterial activity against two bacterial species.

The article says kūmarahou is believed to have anti-inflammatory and antimicrobial properties that can help soothe skin irritations. It also states that it has been used as a natural cleanser for the skin.

The page says kūmarahou is used topically for skin conditions and includes 'Antimicrobial / antiseptic' among its traditional uses. It also says some extracts show activity against microbes in lab studies.

Kūmarahou leaf tea was used as a general tonic to treat a variety of ailments, but was considered particularly effective for chest complaints. This soap is the result of compounds called saponins, which are occasionally used in modern dish wash and detergents.

The article says kūmarahou has a wide variety of uses due to its anti-inflammatory, anti-bacterial, and anti-fungal attributes. It also says it acts as a counter-irritant.

The article says kūmarahou is used topically as a dermal wash for healing skin conditions and burns, and that the flowers were used as a foaming soap in running water. This supports a cleansing/soap use rather than a claim that it has no antibacterial relevance.

Kūmarahou is packed as such, and appears to contain a glucoside which is of benefit in pulmonary complaints (Given 1940).

Kūmarahou - Pomaderris kumeraho | Use: Soap ... antibacterial properties - perfect for any bumps and bruises you ... Chewed by themselves the leaves have a mild numbing effect similar to Sichuan peppers, and can be infused into oils to make a topical analgesic with antibacterial properties.

The page says kūmarahou contains bioactive compounds and refers to saponins as having strong antimicrobial action that can help fight harmful bacteria and fungi. This is a general plant-compounds article rather than a kūmarahou-specific laboratory study.

A review of patchouli antimicrobial research is unrelated to kūmarahou and does not support the claim either way. It was excluded because it is not about *Pomaderris kumeraho*.

Kumarahou is most closely associated with scrub and exposed sites on infertile clay soils, from the western Waikato and Bay of Plenty north (up to the tip of the North Island). It received the common name, 'Gumdigger’s Soap', from early European settlers, who sometimes used its flowers (mixed with water) as soap.

A small evergreen shrub up to 4 m that is relatively short-lived (4-7 years). Can be planted in difficult locations, such as steep banks, scrubby land and ...

The page says kūmarahou is used for respiratory and skin conditions, but it frames many of the claims as traditional uses rather than proven antibacterial effects. It does not provide direct laboratory evidence in the excerpted text.

Pomaderris kumeraho, or kūmarahou, also known as gumdigger's soap and golden tainui, is a plant endemic to the North Island of New Zealand. Kūmarahou has many uses in traditional Māori medicine, although there is little scientific confirmation of its benefits.

A discussion post collating historical references about **kumarahou** notes that "The leaves have good curative properties which are well authenticated and widely known." It summarizes older ethnobotanical sources describing the plant as: "Liquid a relief for all chest troubles - coughs, colds, bronchitis, pulmonary tb - taken internally" and mentions use for "skin cancer" and other ailments.[1] These historical notes show longstanding medicinal use but do not specifically describe antibacterial activity or lack thereof; they mainly document perceived therapeutic benefits in respiratory and skin conditions.

The product page describes kūmarahou as an ingredient associated with natural cleansing and moisture support. It does not present direct evidence that it kills bacteria, but it is marketed alongside antimicrobial-sounding skin-care claims.

The New Zealand Plant Conservation Network species sheet for **Pomaderris kumeraho** provides a botanical description: "Shrub rarely reaching 4m tall with fuzzy twigs bearing wrinkled blunt-tipped leaves..."[8] This document focuses on morphology, habitat, and conservation status and does not mention antibacterial or antimicrobial properties, implying only that such pharmacological data are beyond the scope of this flora entry.