這是一個南中國鄉村的典型風水林，風水林呈新月形，環繞在大菴村的後方。　林地非常茂密，樹冠層高達到30米，與相鄰的農地和長滿灌木叢的山坡形成了鮮明的對比。

風水林擁有熱帶森林的特徵垂直分層清晰，不同的植物物種構成樹冠層和林下層，形成多樣化的生境。樹冠層有主要有木荷而林下層則有羅傘樹丶九節和其他耐蔭植物。樹冠層之下的樹枝都覆蓋著濃密的藤蔓纏結，証明了該風水林非常古老，亦相對不受人類干擾。例如風水林之中長有直徑達30厘米粗的羅浮買麻藤。

大菴風水林共記錄有170種植物，在林地面積相對較小的情況下，物種豐富度十分高，當中亦有不少稀有灌木物種。這裡有首次在香港被發現的嘉陵花及稀有的愛地草。

The site is typical representative of Fung Shui Woodland, which is a unique feature of the South China countryside. The woodland is in a well-defined crescent-shape, lying protrctively around the rear of Tai Om village. The woodland is very dense and its upper canopy attains a height of 30 metres, providing a remarkable contrast with the adjacent shrubby hillsides and agricultural land.
The woodland demonstrates clear vertical stratification, a characteristic of tropical forest in which different plant species consititute canopy layer and understorey and result in a diverse habitat. The canopy layer is dominated by Schima superba (木荷). Ardisia quinquegona (羅傘樹) and Psychotria asiatica (九節) among other shade tolerant plants from a dense understorey. Many tree trunks and branches in and below the canopy are covered with a dense tangle of vines. An example is the Gnetum lofuense (羅浮買麻藤) an individual of the species with a stem as thick as 30 cm in diameter was identified indicating the woodland is very old and relatively free from human disturbance.
A total of 170cm plant species has been recorded at Tai Om Fung Shui Woodland. The species richness is very high considering the relatively small size of the woodland. Most significantly, a new plant record for Hong Kong, Popowia Pisocarpa (嘉陵花) was found at the site. This rare shrub species is abundant there, constituting a representative population for conservation. To date, this species has onlt been recorded at one other location at Ng Tung Chai but that population is much smaller. Another rare plant species Geophila herbacea (愛地草) which is a herbaceous species was found at the site. This is one of the few localities where this species was recorded.