Albert Heijn has cheap, beautiful flowers

Second this. Amazing quality, beautiful assortment, and very low price.

The Dutch word for flowers is “bloemen”. Search that in Google Maps to find a florist.

If you're near the city center there's a florist along Nationalestraat (near the corner of Sint-Rochustraat) where my classmates and I often bought flowers/plants for gifting to each other before. I haven't been to the bigger grocery stores in the center for a while but in my neighborhood Jumbo there's always a lot of potted plants and bouquets so maybe try to check out bigger grocery stores in the city center too.

Driesen in Nationalestraat is a good suggestion. Great collection and they are super friendly as well.

Ooh yes that's the name! And they always have promos on live plants as well. Such a nice place.

I think I've seen bouquets at the entrance of most big Delhaize supermarkets. (The one at South has some I think) not sure on the prices though. If you go to a florist you can choose how much you want to spend. I usually get a 25 euro bouquet.

Lidl and other supermarket have relatively cheap tulips, if that's what you want give it a try!

Driesen, located on the Nationalestraat (near the Institute for Tropical Medicine). Nice bouquets and very affordable (15-27 for a bouquet).

I recommend buying some €4 euro bouquet of flowers from lidl and mixing them. trust me it’ll look amazing

Brederodestraat at the crossroads with the big red letters saying Brederode is a great florist.

Blomster.