Over the few years I've been gardening, I've learned that some plants require lots of effort, but some are very easy. If you are just getting into gardening, you may as well start with the easiest plants! The easiest plants:
keep coming back year after year with no additional effort
produce plenty to harvest
don't require any special fertilizers or other special treatment
Since I live in the desert, we have large temperature variations. We see temps over 100 degrees every summer, and usually get down to the low teens in the winter (except the previous winter when we had a freak snow storm and temps of -10F). In my garden, the easiest plants to grow are:
Growing strawberries seems to be my freak superpower. I started with 25 plants about 3 years ago, and these have propagated so that now I have a bajillion plants. During peak strawberry time I harvest about 20-40 berries a day for over 6 weeks.
Tips for Strawberries
Strawberries reproduce by sending out runners. Make sure to plant them in an area where they have plenty of room to expand since the runners will slowly reach out to cover more and more area.
Strawberries like sandy soil!
Mulch around the base of the strawberry plants. This really helps prevent all of the berries from being eaten by bugs. I use straw or hay to mulch the strawberry patch. Pine needles are supposed to work great as well.
Conventional strawberry growing calls for mowing down the plants after the harvest. I DO NOT do this! I just let the strawberries grow and grow. By the end of the growing season, they grow to where there is no space to walk in a 10-foot X 10-foot area. In the Fall, I invite friends to come over and dig up some strawberry plants to transplant into their own yards. I just make sure they dig them up in rows, so I have some space to walk again in the strawberry patch.
I use green onions as companion plants for my strawberries and apple trees. Whenever I need some green onions for cooking, I just go snip some off a few green spikes. Some of the green onions in my garden have been growing for over 3 years.
Tips for Green Onions
When you need some green onions for a recipe, do NOT pull up the green onions. Rather, just cut off some green parts and leave the rest in the ground. The onions will continue growing new green parts!
Leave some green onions growing long enough to make seeds. Once the onions have been growing over a year, they will make flowers and seeds. The seeds can easily be collected and planted, or just left to drop where they are if you want more onions in that location.
My three celery plants have been growing for over 3 years. They do not tend to make any big stalks like the ones you buy at the store, but they make lots of little stalks and celery leaves. This is a great way to always have some celery on hand for making soups and stews. I do still occasionally buy celery at the store when my daughter is requesting to eat ants on a log (celery filled with peanut butter with raisins on top).
Tips for Celery
Plant the celery in a location where you can leave it growing for years.
When it is time to harvest some celery, just cut some directly off the plant and leave the rest in place. It will continue to grow new stalks and leaves.
I originally planted parsley as a companion plant for my strawberries, and to have a little for making homemade ranch dressing. Parsley has really proliferated in my garden, and has even started popping up around my apple trees. Parsley is great because it attracts beneficial pollinators and predaceous insects to the garden.
Tips for Parsley
Plant parsley in a location where you would welcome more parsley plants. In the late spring, parsley will drop lots of tiny seeds that will readily grow into new plants.
When it is time to harvest parsley, just cut off what you need and the rest will continue to grow.