Eight months has been the best for me without using GA3 in my limited experience. GA3 still seems the best option. I saved some seeds for two years and treated them at 175 ppm. They started to germinate and then declined quickly. Treating ~eight month old seeds at 175 ppm gave high germination results. Treating seeds at two to four months at 350 ppm has resulted in high germination rates. It seems that seeds that have germinated without use of GA3 have been vigorous and flower/fruit in a short timeline. One seedling of ‘Guillermo’ fruited before a grafted ‘Genova Red’, in the same timeline.