What Causes Punky Grapefruit?
My grapefruit tree is 8 yrs old and produces grapefruits that are not sweet and the fruit when cut open is punky and not sweet. It looks healthy and we fertilize every three months with a citrus fertilizer. We have a sprinkler system that waters the trees 3 xs weekly in the hot season and 1 weekly during winter months. Could it be too much water causing the problem?
The following articfle should help: https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
Citrus can be problematic when not watered correctly. Proper drainage is equally important. Too much or too little water will deffinately affect fruit texture and taste.