Would grapefruit fruit faster if I top-worked it onto, say, a 5-year old rootstock instead of grafting onto a 9-month old seedling rootstock? In my environment, the time to first fruiting of citrus grafted on rough lemon seedling rootstock is roughly 1 year for calamondins, 1-2 years for meyer lemon, 2-3 years for limes and mandarin, 3 years for oranges, and longer for grapefruit. Would using more mature rootstock push grafted grapefruit scions to fruit earlier?
John