Colombia is covered with flowers and so are the streets of Bogota. On a lot of corners you will find people selling rosas (roses), girasolas (sunflowers), heliconias (heliconias?), claveles (carnations) and some other types that I can not identify yet. When passing by my wife usually makes some kind of remark about how nice flowers are or that the roses look good today. My normal answer is that people that ask, loose their turn (a dutch saying), but today we passed one of the flower centers in the city and we had a chance to buy some nice colors.
At Calle 88 with 15 there is Parque el Virrey with on the entrance a little flower mall.
Here you can find all the flowers you might wish (except the famous Dutch tulips hehe) and for a very good price. We bought 6 huge red flowers (no idea of the name) of about a meter in height with some extra green leaves for 10.000COP (about 6USD).