I have an apartment here in Lisbon with a pretty sunny balcony and I was thinking about trying to grow a peach tree in a pot. Will it actually produce fruit even without being in the ground? And what size pot would I need?
It's totally possible, but you'll need a really large pot - at least 60-80 liters, ideally bigger. A peach tree in a pot does produce fruit, just less than one in the ground, and it needs some care: regular watering (especially in summer), proper fertilizer during flowering and fruiting, and good pruning to maintain its shape. A sunny balcony in Lisbon is perfect for it, but be prepared to water frequently because pots dry out fast.
It can produce fruit, yes, but there's one detail people sometimes don't mention: peach trees need cold in winter to flower properly in spring. In Lisbon that can be pretty tight depending on the year, especially if your apartment is heated. A large pot is indeed essential like they said, but I'd say it's also worth looking for a variety that needs fewer chill hours, otherwise you risk getting flowers but no fruit afterward.
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