From acorn to oak: Pick several acorns, preferably in October, when they are in an ideal condition. Place the acorns in a bowl of water, and after 3 to 6 weeks, they should have started to germinate. Do not forget to change water often to avoid mould growth. Fill the Acorn vase with water and put your sprouting acorn in it. If the acorn is to small for the vase, use head pins to help it fit. After a further 3 to 6 weeks, a delicate little oak seedling will sprout.