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As a comment about Tree Dahlia (Dahlia imperialis), zuzu wrote:

This plant is not a good choice for most gardens. In my garden, for instance, it grows to about 20-25 feet tall each year, but it's usually snapped in half by the first strong winter wind. Another drawback is that it doesn't bloom until late November here in zone 9, but it succumbs to frost within a few weeks, so the enjoyment factor is quite fleeting when it comes to the blooms.
Bordeaux, France (Zone 8a)
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Apr 5, 2016 4:46 PM CST
It's bizarre because here in the south of France (USDA zone 8A) we have one month of flower starting mid october.

Maybe it has to be protected by a house like this :
Name: Zuzu
Northern California (Zone 9a)
Charter ATP Member Region: California Cat Lover Roses Clematis Irises
Garden Ideas: Level 2 Celebrating Gardening: 2015 Plant Identifier Garden Sages Forum moderator Million Pollinator Garden Challenge
Apr 5, 2016 5:38 PM CST

Plants Admin

That could make a difference. Mine's out in the open, with no shelter on any side.

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