Stipa tenuissima (Mexican Feather Grass) is an exceptionally lovely and graceful ornamental grass that exhibits silvery-green thread-like leaves in late spring, that sway gracefully in the slightest breeze, delicately softening any landscape. All summer, it bears abundant feathery panicles, which are held a little above the foliage and can be used in dried arrangements. Native to the Americas, this perennial grass provides a fairly long-lasting display with its airy silky green leaves turning golden brown towards fall.

Very free flowering and one of the tallest, Nepeta 'Six Hills Giant' (Catmint) is a vigorous herbaceous perennial noted for its billowing, aromatic, gray-green foliage that is topped with 9-12 in. spikes (22-30 cm) of rich violet-blue flowers in early summer with repeat blooms throughout the growing season. Although the stems are 2-3 ft long (60-90 cm), the arching habit of this Nepeta brings the height down to 18 to 24 inches (45-60 cm). Plant large drifts of Nepeta 'Six Hills Giant' along a walkway to create a garden space that overflows with color and enjoy its lemon scent when bruised!

Boasting the biggest flower heads, multiple award-winner Allium 'Globemaster' is a striking ornamental onion with huge inflorescences packed with dozens of small star-shaped violet flowers forming a 10-inch wide (25 cm) globe-shaped cluster! Blooming in late spring to early summer, this spectacular bulbous perennial enjoys long-lasting blooms, and its seed heads are ornamental, persisting for weeks after the flower has passed.