Paulownia tomentosa (Thunb.) Steud is a drought-resistant, low-maintenance and fast-growing energy crop that can withstand a wide range of climatic conditions, provides a high biomass yield (about 50 t DM ha-1 yr-1) and develops successfully on contaminated sites. In Kazakhstan, there are many historically contaminated sites polluted by a mixture of xenobiotics of organic and inorganic origins that need to be revitalised. Pilot-scale research evaluates the potential of P. tomentosa for phytoremediation of soils historically contaminated with organochlorine pesticides (OCPs) and toxic trace elements (TTEs) to minimise their impact on the environment. Soils from the obsolete pesticide stockpiles located in three villages of Talgar district, Almaty region, Kazakhstan, i.e., Amangeldy (soil A), Beskainar (soil B), and Kyzylkairat (soil K), were under research. Twenty OCPs and eight TTEs (As, Cr, Co, Ni, Cu, Zn, Cd, and Pb) were detected in the studied soils while phytoremediation potential of P. tomentosa was investigated for OCPs whose concentrations in the soils were significantly different, namely, aldrin, endosulfans, endrin aldehyde, HCB, heptachlor, hexabromobenzene, keltan, methoxychlor, and γ-HCH and for TTEs (Cu, Zn, and Cd) whose concentrations exceeded Maximum Permissible Concentrations. Bioconcentration (BCF) and translocation (TLF) factors were used as indicators of phytoremediation process. It was ensured that the uptake and translocation of pollutants by P. tomentosa is highly variable and depends on their properties and concentrations in soil. Besides the ability to bioconcentrate Cr, Ni and Cu, P. tomentosa demonstrated very encouraging results in accumulation of endosulfans, keltan, and methoxychlor and phytoextraction of γ-HCH (TLFs of 1.9-9.9) and HCB (BCFs of 197-571). The results of the pilot trials support the need to further investigate the potential of P. tomentosa for phytoremediation on a field scale.