There is approximately 500 acres of woodland at Marks Hall, much of which is designated Ancient Semi-Natural Woodland.

The late Oliver Rackham, an author and academic at the University of Cambridge studied the ecology and development of British woodlands.  He knew the woodlands across the region, and in particular at Marks Hall, extremely well. He recognised that Marks Hall formed one of the most notable groups of Lime wood (Tilia cordata) in England. 

In his book Ancient Woodland, (2nd Edition, 2003) Rackham notes "Native lime grows in about 85 woods in Eastern England; the total area in 1945 was at least 920 acres. Lime amounted to only 4.2% of the area of the woods of the general survey and probably less than 2½% of all the ancient woodland in Eastern England, yet within the two lime areas some 18% of the ancient woodland was lime-dominated."

It is estimated that in the 200 acres of Marks Hall woodland is lime wood, which would give Marks Hall nearly 25% of all the ancient Lime wood in Eastern England.  Moreover Oliver Rackham says that constitutes "one of the largest areas of Tilia cordata in England".