Creeping Jenny (Lysimachia nummularia) is a low-growing, trailing groundcover with small, round or heart-shaped, bright green to yellow foliage and tiny, bright yellow, cup-shaped flowers in early to mid-summer. It spreads aggressively by creeping stems that root where they touch the soil, forming a dense mat that suppresses weeds and excels in moist conditions, making it a good choice for groundcover, hanging baskets, or erosion control on slopes.