I look around the neighborhood and see what plants and trees are growing around the area. I try to bring the same into my build or at least the same color. I don't want my build to look out of place. Landscaping is one last things I do in a build. Sometimes I wait until I play the house if I have gardening Sims planned. I like to mix the plants among the landscaping and just have a vegetable garden. I make it look as natural as possible with terrain paint etc.
My orchard house is my favorite. Take a walk through the orchard and it opens up into a quaint fishing spot with picnic area. I love to put modest houses on huge lot and landscape it to so I can escape the real world. I try to incorporate objects into my landscaping. A bench under a tree with a bird feeder or birdbath close by. A fountain and a piece of modern art or sculpture. It depends where I am building and who is going to live there.
Sometimes I section off the lot and do it section by section. There are also vines and window boxes so it all ties in. I might make a cactus garden just off the sandbox with monkey bars near a pool. On the other side it may be all flowers with a veggie garden in the corner with a lush grassy yard in the middle. The possibilities are endless. One street in my Newcrest looks like prefab houses and every lot has a driveway and flower boxes built wrapping around the foundations of the front porches. Some streets are tree lined with older rustic looking homes. Another street is full of modern tiny homes and cozy gardens and an RV in every driveway lined with flowers. Again, the possibilities are endless.