Buy Flowers › Alternanthera 'Purple Knight' - 4" Pot Alternanthera 'Purple Knight' - 4" Pot $6.50 Striking dark purple-black foliage, cascading plant, spreads 30", for large pots or beds, sun to light shade, heat tolerant Add To Cart Added! Striking dark purple-black foliage, cascading plant, spreads 30", for large pots or beds, sun to light shade, heat tolerant