Trees help reduce air pollution, absorb carbon dioxide, and help cool places that are too hot due to trapped gases in urban areas.
Small trees in your garden will help absorb rainwater so that it keeps your garden from getting too wet and flooding.
Trees placed strategically can provide shade and adjust the climate in your garden naturally, think lettuce and broccoli.
Small trees can help block the wind strategically in your garden and force the wind to go around your garden if you place the trees properly.
You need bees to pollinate your garden. Planting certain types of trees can help attract all kinds of pollinators, including bees.
You can keep trees a lot more pruned and smaller than you think if you pick the right ones for your area.