Illinois Tick-trefoil - Desmodium illinoense
 
Illinois Tick-trefoil (Desmodium illinoense) is a native perennial wildflower that thrives in sunny to partially shaded locations and well-drained soils. This plant is characterized by its delicate, three-parted leaves and clusters of pink to purple pea-like flowers that bloom from mid-summer into early fall. The flowers attract butterflies, bees, and other pollinators with their abundant nectar.
Growing to about 2 to 3 feet tall, Illinois Tick-trefoil forms dense clumps or spreads via rhizomes, making it suitable for naturalized areas, prairie restorations, and cottage gardens. It is drought tolerant once established and adapts well to various soil types, including dry, rocky, or sandy soils.
Beyond its ornamental value, Illinois Tick-trefoil also serves important ecological functions. It is a host plant for various butterfly larvae, including the Southern Dogface butterfly (Zerene cesonia). The seeds of Tick-trefoil are enclosed in small, sticky pods that resemble ticks, giving the plant its common name.
In landscaping, Illinois Tick-trefoil adds a splash of color and supports local wildlife, making it a valuable addition to gardens focused on native plants and biodiversity. Its resilience, low maintenance requirements, and ability to attract pollinators make it an excellent choice for sustainable landscapes.