此地點包括一小片紅樹林，而在紅樹林外是一片長有甘藻和圓葉喜鹽草而適合海洋無脊椎動物生活的海草床生境。
除䃟頭海岸的甘藻和圓葉喜鹽草之外，香港甚少能在潮間帶水域找到大葉藻科和水鱉科一類的開花植物。
全港只有䃟頭及荔枝窩海灘的另外兩個地點有找到甘藻的記錄， 由於甘藻被認分佈僅限於溫帶地區，植物地理學家對這地點找到的甘藻特別感興趣。

The site consists of a small area of mangroves which include the rare Bruguiera gymnorrhiza (Many petaled Mangrove). Outside the mangroves is a sea grass bed of Zostera japonica (Marine Eel Grass) and Halophila ovata. These seagrass beds support an interesting assemblage of marine invertebrates.
In Hong Kong, very few flowering plants of Zosteraceae and Hydrocharitaceae are found growing under strictly marine conditions in intertidal waters or below except Zostera and Halophila species.
Apart from San Tau, Zostera is also found in two other sites in Hong Kong, namely the Lai Chi Wo Beach SSSI and a small beach nearby. Zostera is of special interest to plant geographers as its distribution was previously thought to be limited to the temperate regions.
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