城門「風水林」與附近的「大圍村」息息相關，大圍村於1929年因為興建水塘而被遷離，最後只剩下這片風水林。根據傳統習俗，村民相信這片林地可以增強風水運程，因而著手保護風水林。如果全香港的區域都受到相等程度的保護，相信風水林將會成為覆蓋着大範圍土地的主要林型。在香港，很少有其他地點能像城門風水林般有着茂密、高大、自然的植物覆蓋，亦擁有著具代表性的本地硬木樹種。在這片狹窄的範圍內，共記錄了大約3100棵直徑超過4寸，以及76個品種的樹木。這片林地將為其他相似的遺跡林地提供比較的基準。

This "Fung Shui Woodland" was related to the village "Tai Wai Village" which was evacuated in 1929 as part of the water catchment scheme in the area.
The woodland was protected by villagers in accordance with ancient traditions relating to the inter-actions of Wind (Fung) and Water (Shui) on the village, and is believed to present a remnant of the forest type which might have been expected to cover large areas of Hong Kong if a similar standard of protection had been applied over the whole territory.
There are few other sites in Hong Kong which exhibit such dense, tall, natural plant cover representing an interesting collection of local hardwood trees. About 3100 trees all over 4" in diameter and 76 different species have been recorded in this compact area.
This woodland will provide the basis for comparison with similar relic woodlands occuring elsewhere in Hong Kong.