An elegant plant for shade, this new cultivar from Serge Fafard of Quebec has thick,
rubbery, heart-shaped green leaves with glossy burgundy undersides. Leaf margins are serrated, and the purple stems add to the appeal. In late summer, yellow daisy-like flowers arise above the modest clump. An interesting new selection.
Z3-8 
I. 'Immortality' is almost always in bloom. The flowers have a pure white self with pale lemon-yellow beards. Their sweet fragrance practically makes me swoon. The first flush of bloom begins in early June, then sporadically through the summer with the grand finale of a fall flush in late September. This cultivar has the most consistent fall bloom of the reblooming irises. An outstanding cut flower. 
Not as tall as K. macedonica or as rangy, and although K. 'Mars Midget' will resow it won't do so with as much fecundity as K. macedonica. Charming plant with ruby red pin-cushion flowers, which butterflies find irresistable. Although rated as a Zone 5 plant, I've had no trouble carrying it over in Zone 4. Blooms over a long period (early summer through early fall, and is a must for any cottage garden.
K. 'Fire Dance' is slightly shorter than the standard K. uvaria, but has the same coral red and yellow flower spikes produced in early to late summer. The habit is clumping with strappy, arching blue-green foliage. The hardiest seed strain to date from Jelitto Seeds. Attracts hummingbirds and butterflies.
In mid-late spring light purple flowers, typical of most Lamium, make a splendid contrast to the silver leaves. Great groundcover for shade and good for hiding bulb foliage that's going dormant. From Intrinsic Perennial Gardens.
no fragrance. A great vertical accent with an old-timey look. Perennial sweet pea starts with a large flush of bloom in early summer then sporadically throughout summer into early fall. Makes a nice cut flower. The vigorous vines do need support, so let one clamber up your garden shed - you won't be disappointed. 
strain. Great for drying and satchets. Lavender also makes a nice long-lasting fresh-cut flower. Shorter in stature with silver blue foliage, L. 'Munstead' makes a nice edging plant or a great mass planting. Lavenders hate 'wet feet' especially in winter. I have had several clumps of L. 'Munstead' for two seasons, but I recommend it as an annual here in Zone 4. 
probably the pure white petals and their sunny little faces. L. 'Alaska' is the hardiest strain of Shasta available. The 3" flowers are great for cutting. Shasta daisies combine well with just about anything and are great studded throughout the perennial border. Blooms begin in late spring and if deadheaded will continue for several months. 
Walters Gardens, Inc. Large four inch flowers begin a bright lemon yellow then mature to a creamy buttery color. Excellent, vigorous growth rate on a shorter compact plant. Long blooming - from early to late summer. We're trialling L. 'Banana Cream' in our zone 4(b) gardens. 
foliage. The leaves are pinnate and slightly cupped so that they catch raindrops and dew. The flowers are fantastic spires and come in a wide variety of colors (blue, purple, yellow, red and pink). Lupines are somewhat short-lived for me, but they frequently resow.
lavender-purple flowers. The shortest of the Monardas that Bugtussle offers, M. 'Grand Parade' exhibits excellent mildew reisitance. Great for midsummer bouquets. Attracts butterflies.
demonstrated high resistance to mildew. The scarlet-red flowers appear in mid-summer through early fall and to me look like a lion's head with its mane. Beautifully scented foliage. Monardas need to be divided every few years to prevent die-out in the middle.
Itsaul Plants, M. 'Jacob Cline' adds some punch to the midsummer border. Hummingbirds and butterflies love it. Combine with Gypsophilia, Leucanthemum 'Alaska', and Coreopsis 'Jethro Tull'.
are of a deep raspberry red and more prolific than the other varieties. Nice dark green mildew resistant foliage has a great fragrance. M. 'Raspberry Wine' is the tallest selection that JPN offers. A great cottage garden plant.
A unique relative of Heuchera for partial shade. Leaves emerge green then as summer heats up, the edges of the leaves become red. The color gradually moves toward the inner part of the leaf until fall when the entire leaf will become firy red. Starry, white flowers in spring. Forms a low, spreading mound. An interesting slow-growing groundcover.
(early to midsummer). Foliage has a cat-minty pungent smell when brushed. Great plant to use on rock walls where its flowers can spill over the edge. Nicer habit than most catmints. 2007 Perennial Plant Association Plant of the Year!
Oregano. With an upright and trailing habit it displays none of the invasiveness of its culinary cousin. In mid to late summer the two foot stems sport beautiful light purple flower clusters, which attract butterflies like crazy. The foliage has a delicate oregano scent when bruised. An interesting unusual plant for the front of the border. 
eye-popping show. There's really nothing else that can compare to the tissue-paper like blooms of the tree peonies. They are among my favorites.
be able to offer this brightly colored tree peony. Large, fully double yellow blossoms are fringed in bright orange. A fantastic color for the late spring garden. In a few years plants become shrublike with woody stems. Great in the middle of the perennial border for a knock-out specimen. Leaves are attractive all season. 
color and movement to the perennial garden, and what could be better than this perfect pinky-salmon colored poppy? Flowers are quite large, measuring up to 5 inches in diameter. Although the poppy season is short, it's certainly enjoyable. 
plant makes in the landscape! P. 'Dark Towers' is an improved form of P. 'Huskers Red' from breeder Dale Lindgren. The foliage is a deeper purple, which is retained throughout summer's heat and humidity. The flower display is also much showier with masses of pinkish (rather than white) blooms. At a height of three feet, it's perfectly suited as a striking accent for the back of the border.
foliage on red stems. The white tubular flowers are adored by hummingbirds. P. 'Husker Red' blooms in early to midummer and makes a great accent in the perennial border even when it's not in bloom. 1996 Perennial Plant Association Plant of the Year!
wonderful 'sagey' smell. Starting in late summer P. 'Little Spire' has beautiful lavender-blue flowers over an incredibly long period - straight through early fall. I have had no trouble overwintering P. 'Little Spire' in my Zone 4 gardens. A great plant for hot, dry sites. A vast improvement over floppy old Pervoskia atriplicifolia.
has narrow, pink, fleecy flowers atop sizeable three to four foot plants. P. 'Pink Elephant' starts blooming in early summer and continues all the way through mid fall. An exciting new, long-blooming plant for the back of the border. 
one of the most powdery mildew resistant varieties to date. Very sturdy plants, and the blossoms are of the purest white. 2002 Perennial Plant Association Plant of the Year!
Gardens, Inc - this is the best new Phlox cultivar they've seen in years. Short and compact in stature, plants branch from the crown as well as along the stems, forming profusely blooming bushy plants. P. 'Junior Dream' extends the summer phlox season into early fall. Purple flowers are nicely fragrant and attract hummingbirds and butterflies. 
of Tall Garden Phlox - a smaller (yet not quite 'pixie' size) more compact growth habit, increased mildew resistance and a longer bloom time (midsummer into fall). Nicely fragrant, lavender purple flowers have a star-shaped white eye. A very nice improvement. 
long bloom period (mid to late summer). Good combined with Leucanthemum 'Alaska', Liatris spicata, Pervoskia 'Little Spire', and Miscanthus spp. 
delicate lavender-blue flowers. Creeping phlox has semi-evergreen needle-like foliage that's attractive throughout the rest of the year when the plant is not in bloom. Great on rock walls or as an edging plant in the border.
Jacob's Ladder. Plants are bushy with green and white leaves tinged with pink in the spring. Pretty pale lavender flowers in early summer. More sun tolerant than most Polemoniums with stable variegation. A true stand-out. 
Leaves emerge mottled but then quickly mature to a beautiful solid silver-gray with a narrow green margin. In spring, light pink buds open to blue-pink flowers that resemble bluebells. Forms a very tidy mound.