Generally, taking care of a tree is not an expensive task. For you to be able to grow a tree, all you really need are the basics: water, sunlight, fertilizer, and soil with good quality. The expenses that come with growing a tree can also differ for the kind you want to plant. Ultimately, it would depend on why you are planting trees. If you want to start a small garden, the costs would be more expensive since you would want to hire professionals for the best results.