Climate Zones What Do They Mean?

midwestbonsai

Ok, I know that they give you the minimun temp for a plant.
But what is the maximum temp for a zone?

Say a tree is rated at zone 7 which gives you a min temp of 0 to 5 degrees F.
what would the max temp be for winter survival?

Also at what zone does a tree become tropical?

I was just wondering and I am sure others are as well.

Thanks
-Paul

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Aurelius

Not sure that I understand the premise.
A tree typically is rated to a range of temperature zones; not just one.
The upper range of the growable zone maybe because the winters aren't cool enough or it may mean that the summer is too hot.
Many conifers fall into the latter.

Joanie

Isn't that what the heat zone rating is all about?

If you click on the "heat zone" link under your name, you will find Matt's explanation of the whole thing.
Joanie

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midwestbonsai

My questions are
At what point or zone rating does a tree become a tropical/"indoor"?
And
If a tree is rated for zone 7-10(for example), what would be too warm for the tree over the winter?

does this clarify at all?
-Paul

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