I have a grapefruit tree, which has given a large quantity of fruit each year. The tree is 21 years old and this year there are less than 10 new grapefruit. Can you help? I don't know what the problem is.
Certified GKH Gardening Expert
It is likely a nutrient imbalance. Try adding more phosphorus to the soil with a high-phosphorus fertilizer or bone meal and see if this helps. For other reasons your tree may not be fruiting normally, read the following article: https://www.gardeningknowhow.com/edible/fruits/grapefruit/grapefruit-tree-not-producing.htm