From maintaining biodiversity to protecting coastlines, mangroves are crucial to the environment. However, due to increasing water pollution from humans, mangrove species have suffered significantly. In 2021, 14 out of 70 mangrove plant species were classified as endangered to different degrees in China (Fu et al., 2021). Heavy metals, like cadmium, and lead are extremely harmful to mangroves (Angulo-Bejarano, Puente-Rivera and Rocío Cruz-Ortega, 2021). The metals contain malondialdehyde compounds that cause stress to the plants resulting in increased mortality, inhibition of photosynthesis and growth (Nguyen et al., 2020). Heavy metal resistance bacteria can better utilise the metals in the environment to improve plant growth (Wu et al., 2018). This can be done as some plant growth promoting bacteria have characteristics like the production of indole-3-acetic acid and siderophores, nitrogen fixation and others (Derya Efe, 2020). Thus, different levels of heavy metal resistance bacteria in the water near mangroves may be able to help the growth. Water samples were collected from different locations in Hong Kong near mangrove growth. The samples were diluted into different concentrations and spread onto different functional plates and further tested on heavy metal resistance. The water samples were also sent to ALS company for testing heavy metals, especially: mercury, cadmium, manganese, lead, and copper. The amount of heavy metal in water samples will be compared against isolated bacteria that have heavy metal resistance. This will give us an idea of the effect of pollution on plants. Heavy metals are only one aspect of it. Although the environment is adapting and finding ways to cope with the changes, it is vital for humans to recognise the amount of damage caused and to save planet Earth.