100 Days. Yellow Granex [Vidalia] The Yellow Granex variety was developed in Carrizo Springs, Texas \This onion variety was approved through vigorous testing to be allowed to be called a Vidalia onion. This is also the variety grown in Maui, Hawaii and around Tyler, Texas, where it is called the “Noonday Onion.” It stores fairly well for this type of onion at approximately 1-2 months. Yellow Granex produces large, semi-flat onions with rounded shoulders. Goes great in salads or salad dressings.