Stipa gigantea - Giant Oat Grass Stipa gigantea is tall, striking, ornamental grass suitable for dry sunny locations. Green narrow leaves forming a mound to about 50 cm. or more. In Summer tall stems rise up to 2.5 m. carrying the beautiful dangling sprays of golden flowers. Site: Tolerates Salt and ExposurePosition: Full sunSoil: Fertile, well-drained soilFlowering Period: June & JulyHardiness: HardySize: Height: 250cm (8ft). Spread: 120cm (4ft)