White Seedless Grapes Prime Seedless Round berries of average size for a seedless variety. Crispy light muscat flavour. Thompson Seedless / Sultana A white seedless variety with large elongated berries. The taste is very sweet with muscat flavour.This variety has a good shelf life. Sugraone Exceptionally large berries for an early, seedless variety. This variety has a slight muscat flavour when it is ripe. Regal Very large oblong berries, which are light green to straw in colour. Refreshing sweet flavour with a firm flesh.