Can't help with the answer but I have exactly the same question.
However, we have bought a blackberry - it just says its a bramble -
doesn't give any more specific details about its type. Also, sorry,
newbee question, what's zone 6?
Sorry about the zone mentions..here in the US, the entire country has
been designated with a number, by, IIRC, the US Dept of Agriculture.
When buying perennials, they are categorized by these zones. This way,
someone will not wind up buying a tender shrub which will thrive in a
mild climate, but fail to make it through a harsh winter.
Here is the map for my state.
I've seen similar maps for the European continent posted here in
the last year. I suspect that most of the world has such maps
available somewhere. Having zones that work across a continent
is very usefull. Having them work worldwide would be even better.
I'm in zone 5b suburban Chicago. This spring I plan on starting
some European billberries. Since blueberries and blackberries
will grow here I figure their European kin should also. Still
undecided ground or container, though. Open to suggestions
and following this thread because of the similarity.
I would not hesitate to grow blueberries in a container, as long as it
was winter protected, as they are compact & bushy, but the
blackberries fruit on new canes & I do not know what will happen in a
container. Still it is worth a 10 dollar experiment to find out.
Since you got no other bites, my .02 say it is a bad idea. Brambles
just require too much space. Unless you could put a large trellis
behind the tub, train them, then water them diligently. Still, if you
only have tubs, I'd put them to more productive use. With brambles
you'd get a pound of berries out of a container that will give you ten
pounds of other things.
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