My guava plant is producing sour fruit. Is this because of a nutrient deficiency or because of the type of plant? How can I grow sweet guava fruit?

  • 5
    What variety is it, and what are you fertilizing with? – J. Musser Feb 17 '15 at 21:06
  • 4
    Hi Rama. Welcome to the site! Would you mind posting some pictures of your plant, and some other details like where you live. That will help people give you better answers. Thanks. We hope to see you around! – Sue Saddest Farewell TGO GL Feb 18 '15 at 0:47
  • 2
    It's most likely the variety of guava you've got - the term 'guava' is used for more than one species of plant which produces guava type fruits, some which have sweet fruit, some with sour fruit. – Bamboo Feb 18 '15 at 16:24
  • 1
    I have a tropical Century guava. I've never tasted any sour fruit. However, it is bitter when it is not ripe. You have to wait until they're about Apple sized and changing from green to yellow before they become sweet. – JoJo Feb 23 '15 at 19:21

It is "Sour Guava". It is called "Cas" in Costa Rica. You can make the most delicious drink in the world with it. I always wanted to know if I could buy "Cas" in the U.S. so I researched it a few years back and found that its name in english is "Sour Guava" of course it was all imported and $25 a pound. Super rare stuff outside of central america, Cas is in decline in Costa Rica too... Something environmental. Anyhow enjoy your tree and take care of it.


While I have never grown guava and I know very little about it, I can take a guess:

Maybe it's the light, moisture and/or temperature. I eat sempervivum leaves on occasion. I notice that when it's been hot, dry and sunny for a while, they tend to taste like malic acid (the stuff in green apples that makes them sour). When it's been cooler and not as sunny for a while, they're not very acidic.

Anyway, it could be that your plant is stressed. I know stress causes some plants to produce more chemicals (like it makes hot peppers hotter). It's possible that a stressed guava would be more sour. It's also possible that it's not getting enough sunlight. I heard a rumor that sunlight helps fruit to be sweeter.

It could also just be unripe.

Remember, though, I haven't studied or grown guava, yet.

Edit: Upon some investigation, Wikipedia says that guava fruit may be sweet or sour. It does not say if some varieties are sour when ripe, however. I saw a site that talks about sour guava as if it's a variety of guava. I also saw one site that said green guava are much firmer and sour, while yellow guava (or yellow with a pinkish tinge) are ripe and sweet. Most people seem to be of the opinion that guava are just not sour. So, it's possible that there are either only some varieties that can get sour, and they're less common, or else some people referred to astringent as sour (some people actually do that; so, I consider this a good possibility).


I have a strawberry guava and unless I fertilize it, I don’t get sweet, ripe fruit. Even then, I get plenty of green, sour ones. My mom picks those, boils them, and sweetens to make juice.


I have Psidium guajava seedlings growing not 3 years old. They were well watered and fertilised with good looking fruit. However they are very sour. I have one self sown seedling that is a wildling that was never watered, but gave the most sweet and tasty fruit. Sometimes a first crop can be poor so I will wait until next year's crop to see what is really going on with the sour ones


  • Thank you for your answer; if could include watering & nutrient regimens, and region, could also be helpful. We encourage you to take the Tour, and browse through the Help center, to learn more about how the site works! Thank you! Welcome to the site! – M H Aug 29 '20 at 6:48

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.