Many gardeners lose roses not because of frost, but because of improper preparation for winter. Covering it too early, leaving foliage, or watering in October all create ideal conditions for damping off and rotting. But you can save your rose garden, and all it takes is three simple steps at the right time.
1. Stop watering and fertilizing
As soon as night temperatures drop consistently below +5°C, watering and any fertilizers should be stopped. This helps the plant complete its growing season and enter a dormant state. If this is not done, the rose will send out tender shoots – and they will die at the first frost, weakening the entire bush.
2. Remove everything that could become a breeding ground for disease.
All leaves should be removed and burned, even if they look healthy. This is especially important if there are signs of black spot or powdery mildew. Also trim off unripe shoot tips. They do not overwinter, but under cover they will begin to rot and “pull” healthy tissue with them.
3. Cover only with stable minuses
The ideal time for shelter is when the temperature is stable at -5…-7°C. Use the air-dry method: a frame made of arcs or boards + covering material (spunbond, lutrasil). Do not use polyethylene, sawdust, peat or foliage, as they retain moisture and cause rotting of the root collar.
With proper preparation, roses easily tolerate frosts down to –25°C and wake up in the spring with live buds. And in summer they delight with abundant, long-lasting flowering.
Question and answer:
Is it possible to cover roses with leaves or sawdust?
No. Sawdust, peat, hay and leaves retain moisture, create an acidic environment and promote the development of fungi. Under such shelter, roses often damp out even in moderate frosts. Use airborne materials only.
What to do if you have already covered the roses, but the temperature has risen again?
If the shelter is airy (spunbond on a frame), you don’t need to do anything, it allows air to pass through. But if you used film or dense material, it is better to temporarily open the sides of the shelter to avoid condensation and overheating.
