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Yelp
The Oxford Botanic Garden is right in the heart of the city (it's part of the University) - but you can easily miss it because the signposting is lousy. Even when you get to the right place, it's hard be sure you've found the main entrance.
But once you've found it, it's a lovely place to while away a couple of hours, or an entire day. Even when it's busy, there are quiet places and plenty of space for everyone.
The garden has several sections, including one organized by plant families if you're a student of botany. More likely to be of interest to general visitors are the glasshouses - holding interesting ranges of plants from alpines through to tropical specimens. There's even a pond, with fish and lily pads, in one and there's certainly enough to keep everyone entertained and plenty to educate the kids - with commercial tropical crops like coffee and bananas growing happily.
There are also ponds and rockeries outside, to complement the main beds. And during my last visit the special display was edible crops from around the world - a particular favourite of mine but probably not a permanent feature.
The only bug bears are the lack of facilities - the entrance is small and houses the tills and the tiny 'gift' shop. There is a plant sale stand, but just a small one. The toilets are a hike from anywhere in the garden, being hidden away practically by the exit. But you're only a few minutes away from the town centre, so it's not a big deal. There's no parking though, something Oxford is notoriously bad for, so leave the car at one of the Park & Ride car parks.