Blue Oat Grass with Achillea 'Terra Cotta'

Asclepias tuberosa with Geum 'Fireball'

Agastache 'Apache Sunset' with Echinacea 'Summer Sky'

... and Gaillardia 'Burgundy' with Coreopsis 'Autumn Blush'

Bonnie

Yarrow 'Moonshine', Lavender and Lychnis coronaria.

You all really should figure out how to post pictures. It's much easier to grasp color combinations from pictures rather than trying to visualize it them from words. I use Flickr which includes a handy box full of HTML code that you can simply cut and paste into your GardenWeb message.

Good thread! Let's see some more pictures! :)

You must have 'Nur Mahal'
It is a completely thornless Hybrid Musk rose. There are not even any tiny prickles underneath its leaf mid-ribs. Smooth baby, smooth. It's an insanely healthy rose in my area. The Antique Rose Emporium carries this boldly colored beauty. Very fragrant.

You must have 'Pink Gruss an Aachen'
This is a very old rose that has been enjoyed for many, many decades. It is the PINK sport of Gruss an Aachen, and this pink sport is extremely close to being completely thornless. And, like Nur Mahal, it has absolutely no prickles under its leaves. Pink Gruss is much harder to find than the original Gruss. I recommend ordering it from Chambless, from where all 5 of mine came. Nice light fragrance to my nose.

You must have 'Heritage' (David Austin's English Rose)
This rose does have a few thorns, and they are sturdy ones, but from what I've seen, it is by far the closest of the Austin roses to being thornless. Mine had only about 6 thorns near the base of the plant, and no thorns on the top 2/3's of the bush. I say "had" because I simply snapped them off and they have never grown back. The blooms on this rose look like an old centifolia ... just perfect. In my garden, this rose blooms like crazy from spring through first hard freeze. A very unique and enjoyable fragrance that is always present.

Additional favorite thornless roses for me are:

'Basye's Blueberry' - 100% thornless (available from The Antique Rose Emporium)

'Valentine' - Almost thornless and an excellent landscape plant

'Reine des Violettes' - 100% thornless, IF you buy it from the right supplier. Mine came from The Antique Rose Emporium and it's smooth & beautiful. I highly recommend getting this rose from that source, from Vintage Gardens, or Countryside Roses. Some sources carry virused specimens of this plant, but those three are reported to have clean ones. Some other sources sell a thorny rose under this same name. I would have listed this one up top with the "must haves", but you stressed that you wanted "repeat blooming" and while this one DOES repeat bloom, it does not do so as much as the three "must haves" that I listed. This rose is very close to being my very favorite rose of all, and each year it blooms more and better blooms. This rose was introduced in 1860 and it is a living piece of history. It's fragrance is the best of all my roses.

Unfortunately, I can not recommend 'Mrs Dudley Cross' to you, because your zone is too cold for her to thrive there. But down here, she's a must have. Mine is completely thornless and extremely resistant to any fungus.

Randy

Smooth Ladies are roses with thornless or nearly thornless canes. Most have full "old fashioned" flowers and with the sole exception of Charlotte are strongly fragrant. Growth habit is variable.

A Shropshire Lad (English, 1997) – apricot pink, quartered flower form, tall upright growth habit.
Aimee Vibert (Noisette, 1828) – pure white, small loosely quartered form, medium mounding shrub.
Belinda (Hybrid Musk, 1936) – magenta with white eye, single, tall mounding shrub.
Berries n’ Cream (Climber, 1997) – red and white stripe, semi-double, mannerly climber.
Boule de Neige (Bourbon, 1867) – pure snowy white, globular form, tall upright shrub.
Charlotte (English, 1994) – light yellow, globular flower form, tall upright shrub.
Clotilde Soupert (Climbing Polyantha, 1902) – blush pink opening soft white, quartered, tall aggressive climber; also available as a short shrub.
Cornelia (Hybrid Musk, 1925) – soft coral pink, semi-double, medium mounding shrub.
Cotillion/Perfume Perfection (Floribunda, 1999) – lilac, flattened rosette, short upright shrub.
Dupuy Jamain (Hybrid Perpetual, 1868) – cerise red, deeply cupped, medium to tall upright shrub.
General Kleber (Moss, 1856) – shining pink, loosely quartered, medium to upright shrub, once blooming.
Gloire Lyonase (Hybrid Perpetual, 1885) – creamy white, cupped flower form, tall upright shrub.
Golden Celebration (English, 1992) – deep golden yellow, deeply cupped, medium to tall shrub.
Golden Wings (Shrub, 1956) – clear yellow, single, medium to tall bushy shrub.
Heritage (English, 1984) – shell pink, cupped, tall arching shrub; Rose-Marie is a white sport.
Honorine de Brabant (Bourbon, 1840) – light pink striped with violet, tall arching shrub.
La Reine (Hybird Perpetual, 1842) – medium pink, cupped, tall upright growth habit.
Lady Hillingdon (Tea, 1910) – egg yolk yellow, high centered flower form, tall short upright shrub; also available as a climber.
Louis XIV (China, 1859) – dark smoldering red, high centered flower form, short upright shrub.
Lyda Rose (Hybrid Musk, 1994) – white tipped orchid pink, single, medium bushy shrub.
Marie Pavie (Polyantha, 1888) – ivory, high centered, medium wiry shrub; Marie Daly is a pink sport.
Midnight Blue (Shrub, 2004) – dark purple, semi-double flower form, short shrub.
Nur Mahal (Hybrid Musk, 1923) – cherry red, semi-double flower form, tall mounding shrub.
Nymphenburg (Hybrid Musk, 1954) – salmon pink, semi-double flower form, tall arching shrub
Perle D’Or (Polyantha, 1884) – blush apricot, high centered flower form, medium wiry shrub.
Pretty Jessica (English, 1983) – pink blend, cupped flower form, short upright shrub.
Reine des Violettes (Hybrid Perpetual, 1860) – soft purple, quartered with button eye, tall upright shrub, can be grown as a climber in warm climates.
Souvenir du Docteur Jamian (Hybrid Perpetual, 1865) – dark red, cupped flower form, tall upright shrub to moderate climber, must have afternoon shade.
Yolande D’Aragon (Portland, 1843) – deep rose pink, quartered flower form, tall arching shrub.
Zephirine Drouhin (Bourbon, 1868) – deep magenta pink, high centered, climber; Kathleen Harrop is a light pink sport.

Pink Gruss an Aachen (the one from Chamblees)
Valentine
The Jefferson Rose
Gilbert Nabonnand
Mrs. Dudley Cross
Reine des Violettes

Randy

Accents for Home and Garden

Kartuz

Logee's

Palm Hammock Orchid Estates

Rob's Violets

Plants for Kids (rexes mainly)

Taylor Greenhouses

eBay

Glasshouse Works

Lauray of Salisbury

Antonelli's