Don't want to be horrible, but looking at the write up on the webpage it looks a load of tosh. I mean.... "Imagine having an exciting high-paying job that lets you use your creativity to brighten people's lives with flowers. Welcome to the world of floristry!" HIGH-PAYING???? WTF?!
Personally I think the best way to learn the skills properly is at college or on the job - not from a book or some online course.