Every healthy flower garden begins with good soil. By adding compost to your planting area, you will correct a soil that is too sandy or one that is too clay. You will also add an abundance of nutrients that will help your flowers grow strong roots, stems, leaves and blooms. Put about 2 inches of compost onto your flower planting location and then work it into the soil with a shovel or pick.
By purchasing your flowers locally at a nursery or garden center, you will most likely get plants that grow well in your location. Still, there are other things to consider. If you enjoy the gardening process, you may choose flowers that are more difficult to care for, such as roses. Someone who enjoys the end result less than the process, will want easy care flowers, such as Shasta Daisies.
You also need to know the sunshine requirements of the particular flower, so you can plant it appropriately. Most flowers do love sunshine. That doesn't mean all the areas of your yard are full-sun locations. It's important to have a plan of where flowers will be planted, before you set out to purchase your flowers. Read the plant label to discern it's needs for sunshine, water and fertilizer.
Place all the flower plants around your yard or garden in their location of planting. Stand back and take in the full view. Make sure you like the arrangement before you start planting. When you like what you see, start digging the planting holes. Do one at a time. Early morning is the best time to plant, before the hot sun is upon the newly planted flowers. Use a trowel (small shovel) to dig a whole the same depth as the current soil in the plant's pot. The hole should be, however, a bit larger around.
Turn the plant container upside-down, while holding onto the stalk at the plant base at the same time. If the plant does not easily come out, give it a few knocks on the bottom of the pot. Place the soil and flower plant into the hole. Push soil in around the sides, pushing it down to compact the plant into the ground. The top of the plant, as it was in the container, should be at the same level as the top of the ground.
Some plants prefer a constant moist soil, such as impatiens, while others, such as geraniums like a dryer soil. Water your flowers according to their needs (as specified by the manufacturer's tag). Some flowers do better with dead heading (removal of dead blooms). On the other hand, it won't hurt those with no preference one way or the other. By deadheading, you are assured of healthy plants and a neat appearance. Apply a liquid general-purpose, water soluble fertilizer with equal parts nitrogen, phosphorus and potassium, such as a 10-10-10 fertilizer. Water your flowers first, then apply the fertilizer about every two weeks.