The buzzword of the hour is resilience. Resilience in ourselves and also in our cities. We need it, and trees are one of the things we need for it. That's why we're planting trees in Grünhof Schleswig-Holstein this year, because healthy forests are irreplaceable suppliers of oxygen and drinking water. Why do we plant beech trees in a coniferous forest: The spruce is a very valuable tree species for our timber industry. Its wood can be used more flexibly than almost any other species. Unfortunately, the spruce cultures planted many decades ago are not (anymore) suitable for the location. The dry summers and storms of recent years have caused enormous damage, especially to spruce. What was left behind were huge areas of bare ground, poor in nutrients, which no longer provide a habitat for forest-dwelling species. To avoid this worst-case scenario, these coniferous stands must be converted. In this process, site-appropriate tree species are planted in a spruce stand as a preventive measure to avoid impending bare areas due to biotic (bark beetles) and abiotic damage (drought, storms). A monoculture is thus transformed into a mixed stand. In Grünhof, several thousand beech, yew and silver fir trees are planted as a new forest generation. This diverse mix increases the biodiversity in the future mixed forest many times over and strengthens the resilience of the forest.