Most likely next spring, but there are times when they bloom twice a year. When satsuma trees are too small, don't bother eating the fruits as they will not be good, so better to clip those fruits away. Wait until you have a bigger tree in 3 to 5 years, then they will start to taste great. My satsuma fruits improved dramatically after 5 years when it has grown to 5 ft tall. It's been giving me wonderful tasting fruits since then. But before that time, I almost uprooted it not liking the earlier fruits, but glad the citrus gurus (before this forum was created) have discuss the issue between fruit quality and age of tree and so I waited it out. Now even my one year grafts of other varieties to it tasted excellent also, without waiting 5 years.