Black walnut (Juglans nigra L.) is a light-demanding, competition-intolerant, and tall forest tree species, introduced in Europe from North America at the beginning of the seventeenth century. It has an important economic role in Europe for producing wood and fruits, in agroforestry systems, as an ornamental tree for parks and avenues, for rehabilitation/restoration of degraded lands. The best sites for black walnut growth have warm and mild climates, with frequent and well-spread precipitation, and rich, deep, near neutral, well-drained and moist soils. Black walnut is a fast grower in youth and its height and diameter growth reach their peaks before age 30–35 years. It is globally the best known allelopathic species due to the juglone substance present in all parts of black walnut trees. The species is storm-resistant and not affected by any major pest or disease in Europe. It is regenerated by planting or direct seeding on bare land, in monocultures and mixed stands. The management of stands with black walnut, with a rotation period generally up to 80 years, include weeding (mandatory), cleaning-respacing (in dense stands), thinning (mostly from above), high and formative pruning (mandatory), with the aim of producing valuable wood for sliced veneer, solid furniture, flooring/parquet, cabinetry, panelling, sculpture, musical instruments, gunstocks.

黑胡桃（黑胡桃L.）是一种对光有需求的，不竞争的，高大的林木树种，在17世纪初从北美引入欧洲。在欧洲，它在农林系统中生产木材和水果，公园和道路的观赏树，退化土地的修复/恢复方面具有重要的经济作用。黑胡桃生长的最佳地点是温暖和温和的气候，降雨频繁且分布广泛，土壤丰富，深厚，接近中性，排水良好且潮湿。黑胡桃是年轻人的快速生长者，其高度和直径增长在30-35岁之前达到顶峰。由于在黑胡桃树的所有部位都存在朱古力物质，因此它是全球最知名的化感物种。该物种耐暴风雨，不受欧洲任何主要病虫害的影响。它是通过在裸露的土地上种植或直接播种，单一栽培和混交林来再生的。用黑胡桃木进行林分的管理，通常可长达80年的轮换期，包括除草（强制性），清理清理（在密林中），稀疏（主要是从上方），高和形成性修剪（强制性），以及目的是生产用于刨切单板，实木家具，地板/镶木地板，橱柜，镶板，雕塑，乐器，枪械的有价值的木材。