Walnut trees (Juglans regia) are a good choice as tree species inagroforestry systems in Flanders (Belgium) because of theirecological characteristics. Moreover, walnuts are gainingpopularity fast among consumers making it a promisingbusiness. That is why recently there has been a relatively strongincrease in the number of walnut plantations in Flanders.However, to maximize profit and get the most out of your system,it is important to think in advance on what products you will puton the market and how. You can increase profi tability byvalorizing as many parts of the tree as possible and processing waste products where possible. When planting walnut trees in anagroforestry system the choice is usually made to produce either timber or nuts. Although it is more complex in terms ofprofitability, a combination of both goals is possible with certainvarieties (for example Coenen) or by planting seedlings (usuallyfaster growing). Nevertheless, there are also a lot of innovativebusiness models concerning various other plant parts of thewalnut tree waiting to be discovered.