How to protect zone 7 viburnums in zone 5

gardenut(5)November 20, 2006

I need help deciding wether or not I can plant my zone 7 david viburnums outside in our zone (5)6 yard next spring. I will over winter them in an unheated basement. My non-gardening daughters gave me 3 of them for an aniversary gift. Since these stay relatively small in height I am tempted to plant them outside next spring and some how protecting them next winter. They are so beautiful and I have the perfect spot for them and I have to know that I can protect them enough otherwise they go into containers for the deck...any suggestions? I am willing to do just about anything to protect them (placing straw all around them?) I just got done reading about Japanese maples growing in Canada's zone 3 with winter protection so I have hope!

Thanks

Vicki

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gardengal48

Best to grow them in containers that can be moved to winter protection. These suffer foliar damage even in zone 7 winters and I doubt will even prove to be root hardy for you in zone 5. As they are evergreen, somewhere that provides mild enough temps (freezing or slightly above - avoid too much warmth) and sufficient light is ideal. Insufficient light, even in winter, will create a leggy habit and poor color.

As to the maples, deciduous plants tend to have a much greater range of hardiness than do broadleaved evergreens. And I'd bet those zone 3 Japanese maples are in containers as well :-)

    Bookmark   November 21, 2006 at 9:57AM
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gardenut(5)

The Japanese red Maples are not grown in pots, they are in the ground and these people up north go through alot to get these trees through the winter including building mini green houses around them or literally boxing them up in cardboard and filling it with leaves! These people are inspiring and I read it all on this site so do a search under maples in zone 2 and read for your self...it just might make you want to try and grow somehting out of your zone too!

Here is what I am thinking...I live on the boarder between zone 5 and zone 6. I usually only get plants that are hardy to zone 5 but these viburnum are going to be a challange. So what I am going to do is this. Over winter these shrubs in an unheated basement with lights. On nice days (over 32 degrees) I will bring them out for fresh air and sunshine and plant them in the spring on a hillside. I will ammend the soil and monitor their water. Basicaly give them the perfect environment in which to grow. I will also root several cuttings from them to have in case my experiment fails so I will still have this plant to grow in containers. Then in the winter I will place bales of pine straw around them (I will use the straw as mulch in the spring). Then on the milder days that is all that I will do. On the days that the tempertaure drops below freezing I will place an old window across the top of the straw bales to allow the light in but keep the cold out, create a sort of cold frame. We will monitor the temperature inside when the glass is on to make sure that it doesn't get to hot inside, perhaps keep one side of the glass lifted slightly to allow exces heat to escape. There really is only about a month at the most of really cold weather and that is usually in spurts of a week here and a week there. Otherwise it isn't that bad where we live (back in the woods). I know that this sounds like alot but these stay relatively small so I think that it is possible and besides what else do we have to do in the winter except wait for spring?

Thanks for your input and I will let everyone know how successful (or unsuccessful I am in the spring of 2008!)

Vicki

    Bookmark   November 27, 2006 at 10:40AM
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