Jocelyn K.
Yelp
This beautiful botanical park in Oslo, should be a must see destination on your Oslo travel list. Besides gardens they even have museums, greenhouses, huge manors covered in ivy, and more. Basically the garden is huge. Best part is it's free to enter. You only have to pay for the museums, which you can choose to see or not.
The garden is so large that we went here two days in a row. The first day it was raining rather heavily. It's still beautiful while it's raining, but if you come during a sunny day you'll see all the bees, butterflies, and birds about. I love even though it's definitely being maintained, the garden looks so natural.
My absolute favorite exhibit was the Oldemors garden where the central part is structured as a healing garden for people with dementia. I also recommend visiting the Victoria House greenhouse, which displays some African and Asian plants. It's extremely humid and hot in there. If you have glasses they'll immediately fog up. Outside the greenhouse you can see an exhibition of invasive and harmful plants to the environment along side plants beneficial to the environment.
I could go on and on about all the exhibits, but I'll just list my top two favorites. If you get hungry or need a restroom, they have a small cafe in the garden itself with a lot of outdoor seating. You can get some pre-made sandwiches, pancakes, pastries, and drinks at the cafe. If I ever come back to Oslo, revisiting this botanical garden will definitely be on the top of my to dos.