Gardening is a popular pastime for many people, and a growing segment of the population is working to grow fruits and vegetables of their own. If you have a green thumb, this might be the perfect side business idea for you. First, decide what kinds of gardening supplies you will be selling. Do you want to stick with seeds, plants, plant food, and fertilizer; or are you interested in selling equipment such as shovels, rakes, and hoses?
I surprisingly get a lot of people asking to detail their car. I never intend to make a business of it, but I love doing it to my cars and people ask me to do it to theirs. All it takes is a cheap orbital buffer (mines a used craftsman) and a shop vac. I normally get easily $100 for a basic wash/wax/vac, or $200 to remove scratches and polish then wax the car.