I have been writing a few general posts that cover specific topics that hopefully answer questions for a lot of people, and give a reference to return to. I hope they are of help to you. This is the second. The first is "The Reasons for Winter Protection of Roses".
Basics of Rose Winter Protection
Written by Val Winthrope September 14,2005
Climate Hardiness Zones:
Winter Protection is the practice of doing something to protect your roses from the ravages of winter. Of course, this is not normally an issue for those in the south, but it does affect the northern parts of the world.
For specific information about which Climate Hardiness Zone you are in, you need to find the plant hardiness zone chart for your country, find your area on the map, and then refer to the corresponding zone. Some of the net addresses for these are:
Canada Ã¢â‚¬â€œ https://sis.agr.gc.ca/cansis/nsdb/climate/hardiness/index.html
United States Ã¢â‚¬â€œ https://www.thegardenhelper.com/hardiness.htm
Australia - https://www.anbg.gov.au/hort.research/zones.html
World Zone Maps Ã¢â‚¬â€œ https://www.aroid.org/horticulture/zonemap/index.html
Hardiness or Not Hardiness?
While many roses have no problem with winter frost, cold and ice, many do. Unfortunately, each rose variety is a little different with respect to winter hardiness. Some known "tender" varieties, including china, tea, and some hybrid tea, grandiflora, and floribunda roses will need some protection. When in doubt it's best to protect.
Most rose shrub and landscape varieties, do not need any particular treatment or protection. The key thing to understand is that most roses that are sold are grafted, meaning that the beautiful rose we pay for has actually been "spliced" onto the roots of an unspectacular rose variety which has a more vigorous root. The part on the rose bush where the two varieties meet is called the bud union, and resembles a ball or knot of wood at the base of the plant above the roots. If a hard winter kills the rose bush to below this point, only the rootstock will be left alive, and though something may grow back, it wonÃ¢â‚¬â„¢t be the rose you paid for, as it will be dead and gone.
Winter protection is probably the most debated area of rose care. Many rosarians have developed their own favorite methods, most of which work in some fashion or another, and you will usually be hard pressed to sway them to any other way.
These notes are written for the home rose gardener and are not intended as foolproof instructions on how to bring roses through the coming winter without harm!
Wintering roses can be as easy, or as complicated as you choose to make it. Depending on where you live, wintering roses can be a piece of cake or a nightmare. However, with a few tips you can increase your chances of success.
Wintering roses begins when you plant your rose. Ensuring that you have given your rose the appropriate placement in your garden to allow it to flourish is important to its overall health. Also, for those who live in colder climates, hybrid teas, grandifloras and floribundas are not very hardy in zones below 6. Though we are all told to plant the graft (bud union) at ground level, in order for them to have a fighting chance of surviving, their bud union or graft needs to be at least four to six inches below the level ground surface. This graft is very tender and the whole rose can perish if it is damaged by freezing and thawing during winter. Contrary to belief, this does not effect the roseÃ¢â‚¬â„¢s growth or health in any way.
How to Stop the Casualties:
Rose plants can be killed or injured during winter in any of several different ways even with the greatest of care:
- Direct injury to tops or roots from extreme cold
- Root injury from drying-out as a result of plants being heaved out of the ground by alternate freezing and thawing
- Rapid variation of temperature caused by warming of stems by strong winter sunshine and then rapid freezing
- Injury caused by animals such as mice
- Snow or ice breakage
What can the gardener do to prevent such injury?
1. Choose Hardy Varieties:
Often injury from extreme cold could be avoided by choosing the hardiest varieties. Unfortunately, most hybrid roses have not been thoroughly evaluated for winter hardiness, so rose gardeners must be willing to experiment themselves, or rely on the experiences of other rose growers. Generally, polyanthus, hybrid perpetuals, shrub roses, and many of the "old-fashioned" roses prove more winter hardy than the hybrid teas, floribundas and grandifloras.
2. Provide Winter Protection
When the winter winds blow, gardeners who live in an area where temperatures dip below 5 degrees F need to protect their roses. The goal of this annual procedure is to lessen the effects of freezing and thawing, and keep branches from blowing in the wind, which causes roots to loosen, called Ã¢â‚¬Å“rockingÃ¢â‚¬
Last edited by grandpasrose
on Fri Sep 30, 2005 5:33 pm, edited 1 time in total.