Large-spike bristlegrass is a robust grass species typically found in sun-drenched open fields and along water bodies. This plant is characterized by its long, feathery panicles which can grow quite dense, ranging in color from green to purplish. Its ability to thrive in varied moist soils allows large-spike bristlegrass to establish a strong root presence, contributing to its competitivity and spread. The lengthy stems of large-spike bristlegrass, combined with its distinctive seed heads, make it easily distinguishable in the ecosystems it inhabits.