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goyo, it's because they need full sun to taste sweet,acidic, with good flavors. If you don't give it full sun, it will taste like blend cardboard. My mom move her tree to a shaded area, and quality of fruits is blend. I don't even want to eat it. I keep telling to move it back to full sun as it was tasting very good when i was in full sun. Give it morning sun if you can.
I have a few but mine are in full sun. We have been eating guava since October. The trees are very productive at a young age. We got about 100 larget fruits off of each of our 1 year old trees and we had thinned the fruit set. You can probably get better production in your shade area if you do heavy thinning.