Gardens can be an annual event… if you want to re-seed and replant every year. That’s fine for the pots on our deck, which add color and delight for the season. For longer ranging garden beds, you can build up biennial and perennial plants that come back year after year, with occasional dividing and spreading about (your yard and as many neighbors as you can play plant-tag with).
Bushes and trees take an even longer range view to the garden. A tree can take half-a-dozen years to get established (at least in our clay-shale ground) and will likely be around for most of your lifetime.
For years I have worked at getting under-story trees growing around the edge of our forest. The fruit trees, which are more successful at beautiful flowers than fruit have come from apples and peaches which we ate, then planted the seeds. Persimmons and paw-paws, native to this area, came from local nurseries specializing in native plants.
Dogwoods sprout like weeds, where we keep the deer fenced out. I just leave the ones that have come up in the right places, and transplanted the others. Redbuds I have grown from seeds, or at least tried. One survived, one, two, three, four, five years. Now, at least six years in the ground, we have our first bloom!