KC Gardens

Overwintering container roses?

Q&A

Should the hard freeze of 25F be just a couple of nights or consistently mid 20s? Also, will this work for other containerized perennials? Thanks for your help. - Elizabeth -

Comments

  1. 5 months, 1 week ago

    A hard freeze is generally considered to be below 28 degrees F. Where plants are concerned, I believe the number of hours below 28 degrees comes into play also. One hour may not have a great effect, whereas 5 hrs. will. Some plants are more susceptible to freeze damage than others.

    Another factor is that our yards have mini-climates, some areas warmer, some colder, etc. Generally the city is warmer than say MCI airport.

    With respect to your roses, a hard freeze should cause the plant to go completely dormant. If they are still in containers that are above ground, I suggest you bury the pots and mulch. This will keep the roots from freezing, as they would if above ground. This method would be good for any other perennials you have in pots.

    In the last analysis, a hard freeze is a hard freeze and depends not on the number of nights at 27 degrees or below, but the number of hours at the lower temperature, in most cases. Winter is upon us, time for our plants to rest.

    Hope this helps somewhat.

    Carole - Johnson County Extension Master Gardener

  2. 4 months, 1 week ago

    Thanks for the advice Carole! I think it’s time for us all to rest….

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