Post Hill is a designated Leeds Nature Area on the western end of Farnley, and partly in Pudsey.

Tree species include oak, birch, ash, hawthorn, hazel, yew, and field maple.

In the undergrowth, bluebells, brambles, bracken, hart's tongue fern, and woodrush are found, as well as ramsons (wild garlic), lesser celandine, wood anemone, yellow archangel, and sweet cicely.

Two large areas of acid grasslands and meadows remain on the eastern side of the beck, and one west of it, adjacent to Pudsey Road.

Wildflowers in these meadows include bird's foot trefoil, oxeye daisies, autumn hawkbit, tansy, and red clover.