This is special for "Earth Hour", nominally available for planting only up to 27 March. but actually available for a day or two later. When planted, even if 27 March has gone, it will produce this message: "Once fully grown, the Earth Flower will allow you to 'turn out the lights' in your Garden in support of Earth Hour (8:30pm Saturday March 27th.)" (2010) Don't delay for ever, though. If you accept a gift of one in June, expect a message like this: Sorry - that gift has expired. The Earth Flower can only be planted until Earth Day (April 22nd)