Run, the tree spade business is notorious for thriving in high end construction jobs, new shopping malls, neighborhood entrances ect.... over the past 6 years 4 owners have gone bankrupt in my area Due to the construction depression. If you want my opinion stick to what you are familiar with and buy some properties to maintain.
Ive taken advantage of the world market and started a new business. We are building bombs in the shape of prayer blankets for our middle eastern customers. Business couldnt be better. The prophets are going through the roof!!