@MinistryOfGoodIdeas@ieji.de Eucalyptus are also very invasive and quick growing and suck a lot of water out of the soil. They have become a big problem in Portuguese Madeira (in areas where they are not grown as a crop). By contrast the native Madeiran Laurissilva forest actually traps water from the air and helps feed the levadas (water channels) then transport water to the more heavily inhabited south of the island..