You'll be surprised, but the conventional wisdom that places the coldest days near the full moon is often true. Those who want to plant perennial gardens can build a bed around several favorites. Be sure they have good drainage or the bulbs will rot. Irises and peonies provide late spring bloom. The true lilies bloom in June and also need good drainage.
Day lilies are the backbone of the midsummer garden.
Tall phlox, black-eyed susans and coneflowers take the garden into fall. Most of the familiar annuals from petunias to marigolds will thrive here during the summer. Just remember they need to be able to withstand 100-degree days that can be hard on plants such as pansies. You also can grow most vegetables in Sioux Falls. Strawberries, raspberries and blackberries are fruit staples.