Panic Grass Seeds126 140 days. Panic grass seeds grow one of the world's most popular greens and efficient perennials ever. Panic grass matures into 36 48 grassy stalks cascading with 6 8" feathered plumes perfect for any living room, office, or patio. Panicum is native to the tropics of the world thrive in a variety of moist, hot, and humid gardens. Panic grass complements well with a variety of grasses known for low maintenance commercial and residential