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Boston is solidly zone 6, and protected areas in boston support zone 7 
plants, as do the more coastal neighborhoods.  I don't know if rooftops 
get substantially colder.  How high are these roofs?  And how close to 
the water?  And how much heat leaks through the roofs?

I bet you can plant most zone 6 fruits in these planters without much 
trouble.  I'd worry more about summer drought.

Ginda Fisher
commutes to Boston every day


On Friday, July 25, 2003, at 08:42  AM, John Bunker wrote:

> Some friends are doing a community service project planting trees and
> vegetables in large (roughly 9 ft x 9 ft) cement planters on a roof 
> top in
> Boston.  (Zone 5-6)  They asked me what  to plant for fruiting trees.  
> These
> planters are definitely stationary, so the trees will have to stay 
> outside
> all winter.
>
> Any suggestions?
>
> Thanks
>
> John Bunker
>
> Palermo ME
>
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