Sweet Corn seeds were released with the fund raiser Sweet Seeds for Haiti, where money would be donated to charities that work in Haiti. When a week long license to plant was bought with FarmVille Cash, a farmer would also be able to send the Sweet Seeds Gift Flag as a gift to his/her neighbors. They also never withered, making it the best to plant if you might not visit for a long time. This Sweet Corn could not be mastered. There is however an official Sweet Corn Mastery Sign in the FarmVille database.