The Laeken greenhouses were created by Alphonse Balat from 1873 at the request of King Leopold II of Belgium. They are made of metal and glass and are installed in the grounds of Laeken Castle. Each year they are open to the public for 3 weeks in spring (April 29 to May 20, 2024 - closed Mondays and public holidays). Drawing with colored pencils on A3 sheet.