At her summer home Tolvekarna, Estrid Ericson came up with the idea of letting acorns sprout in a single small glass vase. The form was inspired by the classic acorn shape and she broadened the neck slightly so that the acorn could fit into place easily and take root.
Pick your acorns in October, when they are in an ideal condition. Place them in a bowl of water, and after 3 to 6 weeks, they should have started to sprout. Fill the Acorn vase with water and put your sprouting acorn in it. After further 3 to 6 weeks, a delicate little oak seedling will sprout. Avoid direct sunlight since sun through glass may cause burn damage to adjacent surfaces.