der Pfirsich
peach
A round, juicy stone fruit with velvety skin and yellow-orange flesh.
Im Sommer esse ich am liebsten einen reifen Pfirsich direkt vom Baum.
In summer, I like eating a ripe peach straight from the tree best.

peach
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peach
A round, juicy stone fruit with velvety skin and yellow-orange flesh.
Im Sommer esse ich am liebsten einen reifen Pfirsich direkt vom Baum.
In summer, I like eating a ripe peach straight from the tree best.

You can tell whether the fruit or the tree is meant from the verb. Verbs like 'essen' (to eat), 'kaufen' (to buy), or 'schälen' (to peel) refer to the fruit. Verbs like 'blühen' (to bloom), 'wachsen' (to grow), or 'pflanzen' (to plant) refer to the tree.
Dieser saftige Pfirsich schmeckt wunderbar.
This juicy peach tastes wonderful.
When referring to the fruit, it is often described with adjectives such as 'reif' (ripe), 'saftig' (juicy), or 'süß' (sweet). A well-known variety is the 'Plattpfirsich' (flat peach).
Für den Kuchen brauchen wir drei reife Pfirsiche.
For the cake, we need three ripe peaches.
When talking about a single fruit, you use the article: 'Ich esse einen Pfirsich' (I am eating a peach). When talking about the type of fruit in general or as an ingredient, the article can be omitted.
Dieser Joghurt schmeckt nach Pfirsich.
This yogurt tastes like peach.
mango
'die Mango' and 'der Pfirsich' are both sweet, juicy fruits with yellow-orange flesh. For that reason, you can mix them up when eating or shopping. A mango, however, is a large tropical fruit, usually oval and with a large pit. A peach is rounder and has soft, velvety skin. The article is also important: it is 'die Mango', but 'der Pfirsich'. When talking about a tropical fruit for smoothies or Asian dishes, 'Mango' usually fits. For a round summer fruit with soft skin, 'Pfirsich' fits.

Im Sommer esse ich gern einen Pfirsich, weil er so saftig ist.
In summer, I like eating a peach because it is so juicy.
Für den Smoothie schneidet Lisa eine reife Mango in kleine Stücke.
For the smoothie, Lisa cuts a ripe mango into small pieces.