Common name:Blue Spire Russian Sage
Botanical name:Perovskia 'Blue Spire'

'Blue Spire' is a selection of perovskia that grows about 3 to 4 feet tall and 2 to 3 feet wide (though it will grow larger if over-watered). New wood is white and fuzzy; leaves are a soft green to grey-green and finely cut, giving it an airy appearance. Flower spires of fuzzy, lavender blue flowers begin in June and continue through the summer months. Useful in the perennial or shrub border, with ornamental grasses, and as a cut flower.

Common name:Gaura
Botanical name:Gaura lindheimeri

Gaura is a lovely addition to a perennial border, with its fine green foliage and delicate white to pink flowers. The plant has an open vase shape, and grows about 36 inches tall and 24 to 36 inches wide. Leaves are fine, green, and sometimes spotted with maroon. Flowers are arrayed on long stems and are reminiscent of butterflies; the blooms open from the bottom of the stems towards the top, over a long season of bloom (early summer to fall). Its airy quality creates movement in the garden. Combines well with other perennials and ornamental grasses. A number of named cultivars are now available, some with more distinctively pink flowers or variegated foliage.

Common name:Hummingbird Trumpet; Fire Chalice
Botanical name:Zauschneria latifolia

Eye-catching as red lipstick, little red-orange trumpets stand out from leafy stems, creating a lovely sphere of color that lasts from mid-summer to frost. Native to droughty, rocky places at higher elevations, it also makes its home along waterways, indicating that a little additional water will be appreciated and used to extend the flowering season. Fire Chalice will form a slightly woody perennial base then die back to the ground with the coming of the first hard frosts. Grows 12 to 18 inches tall and about 24 to 36 inches wide.

Common name:Missouri Evening Primrose
Botanical name:Oenothera macrocarpa

Missouri evening primrose is a sprawling perennial that typically grows 6 to 12 inches tall and 12 to 18 inches across, though through reseeding, it can spread farther. It has singe, 4-petaled, mildly fragrant, bright yellow flowers which open for only one day (usually open late afternoon and remain open until the following morning). Flowers are generally upward-facing, but sometimes rest on or touch the ground. Long spring to summer bloom period. Flowers are followed by somewhat unique, winged seed pods. Narrow, lance-shaped leaves. Stems are sometimes a vivid crimson red. Grow in rock gardens, perennial borders, parkstrips, and evening gardens. Many cultivars available.

Common name:Desert Willow; Desert Catalpa
Botanical name:Chilopsis linearis

Desert Willow is a small, deciduous tree with shrubby inclinations. It grows about 15 to 25 feet tall and nearly as wide, with an open, though twiggy appearance. New bark is green, becoming brown and shaggy as it ages. Leaves are fine-textured, long and narrow, and willow-like. Remarkable, orchid-like flowers of white and pink appear in late spring and continue, to a lesser extent, all summer. It can be pruned as a multi-stemmed, low canopied tree or left more shrubby. There is a specimen at the Greater Avenues Water Conservation Demonstration Garden.