Psidium friedrichsthalianum
Costa Rica Cas Fruit, Cas GuavaFamily: Myrtaceae
Origin: Costa Rica
Costa Rican guava is a species of guava found mostly in Costa Rica but also grown in Guatemala, Nicaragua and other Central American countries. It has been successfully grown in California now and can be grown in mild higher regions.
Usually used to make jams, jellies, and preserves, or as a flavoring for drinks. It is used as the base for fresco de Cas, in which Costa Ricans mix it with sugar and water and sometimes add cream for a slightly acidic fruit drink.
Delicious flavorful fruit is sub-acid, great for drinks of eating out of hand for those who like sweet-n-sour fruit. Lots of vitamin C.
The yellow fruit, 2-3" around, similar to the common guava growth habit is similar to the cattley guava. Mature trees seem capable of withstanding short frosts.
Seeds germinate readily and seedlings grow fast.
Similar plants:
Cas Guava fruit is used in traditional Costa Rican drink "Agua de Cas," a refreshing blend of cas juice, water, and sugar.
Cas Guava fruit is packed with vitamin C: about four times more vitamin C than a typical orange, making it an excellent immune booster. It's also rich in antioxidants, which help combat oxidative stress and reduce inflammation.
Cas guava tree is pretty hardy, thriving in poor soils and resisting pests and diseases.
Learn more about Cas Guava.
Recommended Fertilizer: SUNSHINE C-Cibus - Crop Nutrition Booster
SUNSHINE-Honey - sugar booster
SUNSHINE C-Cibus (NPK 2-2-4) - Crop Booster for every watering. 
SUNSHINE C-Cibus (NPK 2-2-4) - Crop Booster for every watering.