Horsepower is an important factor to consider when choosing a garden tiller. If you\'ll be breaking up a lot of new ground with your tiller, you may want to opt for one that has more horsepower.
Conversely, if you will be maintaining garden beds that have already been previously cultivated, then horsepower may not be such an important issue when purchasing. Consider the work you will be doing with your garden tiller. If you are a casual gardener with a vegetable garden and some flower beds, then you should do just fine with a 5 - 6 horsepower tiller.
For someone in the market for a tiller for business purposes, such as growing and selling at a Farmers Market, it might be wise to choose a larger horsepower tiller.