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Dahlias are mid-to-late season flowers that come in a vast array of colors and forms, from small bedding dahlias to plate-sized blossoms atop 6-foot stems. Native to Mexico and Central America
In order to flower well, dahlias need full sun, preferably at least six to eight hours a day.
Dahlias like a rich, well-draining soil with plenty of organic matter and a fairly neutral soil PH of around 6.5.
Dahlias—especially young plants—do not need a ton of water in order to thrive. In fact, over-watering the plant can actually pose more of a potential issue, as excessive water can cause them to rot.
Read more on: https://www.thespruce.com/growing-and-caring-for-dahlias-1402255
Generally speaking, though, geraniums prefer well-drained, moderately rich soil. Most will do well in either full sun or part shade, but they like to be fairly dry—they can become prone to mildew if kept damp.
Plant geraniums so that the crown of the plant is at ground level or slightly above. Planting too deep can prevent them from flowering. Cutting them back after flowering is complete often prompts a second bloom period later in the summer.