Hardiness of Bush Roses: Don’t Trust the Label!

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If you live in a cold climate, be careful when you buy a bush rose, that is, a hybrid tea, a grandiflora or a floribunda rose (as opposed to a shrub rose). The label is not telling the truth about the plant’s hardiness: it’s a sort of horticultural little white lie. And if you don’t know this, you can find yourself, horticulturally speaking, screwed.

When a bush rose label says zone 5, it really means zone 8! Ill.: pngpicture.com, montage laidbackgardener.blog

You’ll find these roses labeled as being adapted to hardiness zone 5, which seems to make them great choices for the northern half of the US and some parts of southern Canada. In fact, though, they are nowhere near hardy in either area. Most are hardy only to zone 8. In other words, forget their surviving in Boston or Minneapolis or Toronto: they’ll freeze to death in the winter in most areas north of the Mason-Dixon line. Why this blatant lie?

Excellent winter protection is required for most bush roses. Ill.: http://www.gardeners.com

It occurs because nurseries assume you already know these roses are not hardy enough to survive on their own, that you are aware they need protection in almost any climate where prolonged winter temperatures below freezing are expected. Their zone 5 label is designed to give you an idea of what the plants can take if they are carefully protected for the winter. You’re expected to know that means, for example, abundant mounding if you garden in zone 7, a rose cone filled with mulch in zones 5 or 6 or even digging a trench and burying the plant for the winter if you’re in zone 4. And the same nurserymen assume you know that a really hard winter will probably kill these roses even with a good protection. Yes, they’re really that frost tender!

New Gardeners Always Get Taken

But this isn’t the 1950s when the average family had just moved from the farm to a suburban lot and brought lots of gardening experience with them. Those suburban gardeners may have been novices, but they’d seen their parents growing them and knew bush roses needed protection; plus they expected gardening to be hard work (that sort of a negative attitude towards gardening is slowly dissipating today), so didn’t think twice about the added trouble of plants needing winter protection.

Some 60 years later, that old gardening knowledge has often been lost. Yes, more people today are trying gardening than ever before, but many new gardeners never saw their parents or even grandparents garden. The whole thing is totally new to them. How are they supposed to guess that a zone 5 label means a plant is only hardy in zone 8? Even if you told them, it seems so ridiculous they probably wouldn’t believe you.

Bush rose killed by the cold. Photo: source unknown

How many gardeners in colder climates lose their faux-zone-5 bush roses, even with winter protection? I’ll bet that most unprotected ones are toast by spring after a tough winter. It’s just unfair to expect beginning gardeners to know that, when it comes to bush roses (and only bush roses), zone 5 actually means zone 8.

I’m concerned that if beginning gardeners have a bad experience, they may give up a hobby that should be fascinating, healthy and fun. And that’s unfortunate for the gardening world … and the nursery with the lying label loses a client too.

Truth in Advertising

Ideally, the hardiness zone given for any plant ought to be its real one. Of course, I fully understand the dilemma of a nursery owner: if he gives “zone 8” as the hardiness zone for a hybrid tea rose, he’ll scare away any gardeners from zones 1 through 7. I therefore suggest the following compromise. 

Why not label the plant as “zone 8 (zone 5 with winter protection)”? That would make things much clearer. Even a beginner gardener would certainly understand he or she needs to do something to protect the plant from the cold and would, with luck, get information on how to do so from the garden center selling the plant.

Shrub Rose Labels Tell the Truth

Hardy shrub rose ‘Winnipeg Parks’. Labeled zone 2, it really is a zone 2 plant! Photo: centredejardinbrossard.com

Oddly, the same nurseries that lie about the hardiness of bush roses tell the truth about shrub roses! These roses are bigger, fuller plants and most are naturally more cold resistant (hardy) than the bush rose trio: hybrid teas, grandifloras and floribundas. Nurseries proudly list their true hardiness zone on the label: 2, 3, 4 or 5, depending on the cultivar. No winter protection is needed for these hardy roses as long as you plant them in their proper zone or a milder one. Thus, a shrub rose labeled “zone 2”can be grown in zone 2, but also in zones 3, 4, 5, 6, 7, 8 and 9 (most roses have a hard time with tropical climates: zones 10 and above). And a shrub rose bearing a “zone 5” label will grow, without protection, in zones 5, 6, 7, 8 and 9.

Make Life Easier

Choose the right plants, then relax and let them grow. Photo: laidbackgardener.blog

As a laidback gardener, I strongly encourage northern gardeners to prefer hardy shrub roses over frost tender hybrid teas, grandifloras, and floribundas. After all, one of the principles of laidback gardening is to stick to plants adapted to your climate. Not needing to protect a plant for the winter not only means less work in the autumn, when you cover or bury the plant, but also in spring when you remove the protection.

So, cold climate gardeners, go with shrub roses: they’re so much easier to grow!

Article originally published on April 9, 2015. 

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5 thoughts on “Hardiness of Bush Roses: Don’t Trust the Label!

  1. Nancy

    Are there varieties of multi flora roses that are more cold tolerant, that might survive in zone 5b without winter protection. I am particularly interested in the Iceburg variety. Thanks!
    Nancy

  2. As a native of the Santa Clara Valley, which happens to be one of the best place in the World for roses, I can not imagine a climate that would be too cold for roses. I certainly can not imagine living or gardening in a climate that is too cold for roses. However, I can totally understand how they are marketed without mention of the protection that they would need from extreme frost. One of my pet peeves is that roses are sold without any explanation that they require as much maintenance and specialized pruning as they do. People really believe that they can just plant them and let them go, or that so-called ‘gardeners’ know or care how to maintain them. They might bloom nicely in the first year, but then become congested thickets by the next year. Gardeners just shear them with hedge shears. It is deplorable.

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