How close do you plant landscape plants in Florida. Most of my Landscape Design experience has been in New England and I have been known to plant trees and shrubs a little too close because I am really impatient for things to grow in. However in Florida I would be known as a person who plants too far apart!! The difference in Florida's growing season is that plants grow about 9 months out of the year unlike the short growing season up North. So you plant a cute little 6 inch Canna bulb and it is 6 feet tall and 3 feet wide in a year. Given that information, spacing depends on the mature size of the plant- you need to research a bit. Look how big the plant is going to get and space it accordingly. Do not plant a tree 6" from your foundation or you WILL be sorry.
The above photo is of Ginger and Dwarf Natal Plum ( nice combination) but they are planted 2 feet apart. Both of these plants will get 4 feet across and you will constantly have to prune them back- what a waste of plant material. Give plants the proper space and you will reduce the money you have to spend in the beginning and you will reduce your maintenance and if you are a landscaper you will have happy clients!