The Ta’ Baldu and Wied Ħażrun area supports one of the four forest remnants of the Maltese Islands, based on a small number of Holm Oak trees (Ballut). Although the area has been vandalised in the early 1990s, the area is important for a number of other species, including the very rare Evergreen Rose (Girlanda tal-wied), the Hoary Rock-Rose (Cistu roża) and a number of fungi known from the area, including the rare Stinkhorn (faqqiegħ). A small number of native White Poplar specimens (Luq), are also found in the area, as well as a large, originally planted, individual Pecan Nut Tree (Ġewż tal-Pekan) specimen.
The site has been scheduled in 1996 as Area of Ecological Importance and is protected as a Nature Reserve and a Special Area of Conservation of International Importance. It is also a Natura 2000 site.
MEPA declared this site as a Tree Protected Area on the 24th May 2011, in accordance with the provisions of the Trees and Woodlands Protection Regulations (2011) as per Government Notice number 473/11.