If you have a specific plant in mind to grow, check the light preferences for that plant and choose your plot accordingly. You may end up wanting to choose an area with more or less sun than your original plot has. If you plan on planting several different types of flowers, choose ones with similar light/shade requirements so that they grow equally well in the same location.
Look for the completed growth size of the flower. Will it become very large and bushy, or stay relatively small? Will it grow upwards and become tall or outwards like a vine? Ask about native flowers before looking at all the available varieties. Flowers indigenous to your area are already known to be successful growers in your soil, temperature, and humidity zones. Check to see if the flower you are growing is an annual or a perennial. Annuals bloom only once a year and must be replanted yearly, but are known for their bright colors and beautiful blossoms. Perennials grow back every year without needing to be replanted and will continue to grow larger over time. Read the tag for the watering requirements for the flowers. Some need water often, while others require it only infrequently. If you are getting multiple different species of flower, try to choose ones with similar watering requirements. [1] X Research source
Use a farmer’s almanac to find the best time to plant flowers in your area. Because of differences in weather in different locations, flowers can be planted anywhere from February - July. Check the seed packets of the flowers you are planting to find the best planting time for your flowers.