There are multiple plants throughout the gardens that are native to Indiana, others to the United States, and still many more from other countries, as well as those of a cultivated origin. With this wide array of possibilities, it is nice every now and again to focus on something found originally in the state of Indiana. Two native Indiana plants are Spigelia marilandica and Delphinium exaltatum. These two flowers bring color to the garden, and can be used in various places, especially when trying for a more naturalized appeal. Seasonal horticulturalist Helen Morlock considers Spigelia marilandica to be her favorite flower while I really enjoy seeing Delphinium exaltatum amongst many other native Indiana plants.
Spigelia marilandica (Indian pink)
Photo courtesy of North Creek Nurseries
Spigelia marilandica is known as Indian Pink. This shade loving plant is great for many homeowners’ shady areas created by windbreaks and other trees and shrubs. This woodland native loves moist and rich soils that have good drainage and some organic matter present. It is a perennial native, growing well alongside the native Aquilegia canadensis (columbine), or in among other summer blooming perennials, such as salvias and geraniums. One can also plant it beside or among a variety of hostas, lungworts, and other shade perennials.
In the spring, the plant should be divided if already present, or planted as transplants. It will self-seed, as the mature seeds will pop out of their seedpods and onto the ground around the plant. Maintenance-wise, this plant requires little once it is in a shady spot with a moist, well-drained soil. (Try to help keep the soil moist during the hot summer months!) Just remember to cut the plant back to the ground in the fall for winter protection.
Red and yellow tubular shaped, star flowers (two inches in length) can be found in early summer on plants that can be up to 2 feet tall and wide. These plants have opposite glossy green leaves that can get up to 4 inches long. The flowers for the Indian Pink are one-sided as well. The best flower display occurs in June, with blooms reoccurring throughout the rest of the summer. Right now, we have some blooming on the museum grounds along the tennis courts. This is along the drive of the Lilly house, where the tennis courts used to be located.
Delphinium exaltatum (tall larkspur)
Image courtesy of Mt. Cuba Center
Delphinium exaltatum is known as the Tall Larkspur. It is named thus due to its height of 4 to 6 feet, whereas many others in the Delphinium genus do not reach such heights. Flowers occur on terminal racemes, being gentian blue in color. Others might consider this color to be more of a purple than a blue. So be sure to know that sometimes when you ask for blue flowers (especially from a florist) that they might actually be closer to what you consider as purple. Larkspur comes from the shape of the flower, which looks like it has a spur. Dark green leaves are palmate, each with three to five lobes.
Protect the tall larkspur from the winter winds. In summer, color might fade in hotter weather but usually does better here in the north than further down south, so give it some afternoon shade from the hot summer sun. Flowers bloom during the summer, later than others of the same genus. Overall, this native plant enjoys full sun, well-drained fertile soils, and can be 4 to 6 feet high, as mentioned above, and 1 to 2 feet wide. Once the flowers have finished, remove the stalk so that the plant has a chance to produce more flowers for you to view and enjoy.
Delphinium exaltatum (tall larkspur)
Photo by Audra Franz
Here at the IMA, the tall larkspur can be found in the more naturalized area of the Formal Garden. Facing the entrance to the Formal Garden with the lawn area (tennis court area) to your back, the larkspur can be found on the left, before getting to the pots sitting at that entrance.
Filed under: Greenhouse, Horticulture, Indiana, Oldfields