Blue Oat Grass. Evergreen ornamental grass valued for its fine, arching blades of steely blue foliage that form a neat, rounded clump. In early to mid-summer, tall, airy flower spikes emerge, bearing oat-like, golden-tan seed heads that sway gracefully in the breeze. Drought-tolerant and low-maintenance, it prefers full sun and well-drained soil, making it a superb choice for borders, rock gardens, and contemporary landscapes where texture and cool-toned colour are desired. 70cm.