Light and Placement

John_Morrow

I have several bonsai trees of mine on the roof of my apartment in San Francisco. The sun they receive is for most of the day, and I'm wondering if that's too strong/much. I placed them next to a foot-tall wall to sheild them a bit, but they're probalby getting close to 10 hours of sunlight a day. The trees are: Juniper, Shimpaku, Cypress, Elm, and Cotoneaster. My biggest problem seems to be from the shimpaku: all of my trees are spurting new growth, and this guy seems to be loosing his needles every few days with no signs of new development. They are adequately watered, or so I think, and most seem to be doing quite well.

Is there a problem with my rooftop placement in general? In relation to the Shimpaku? Thanks in advance for any responses.

John

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TreeBay

There's no problem with the sun exposure none of the trees you mentioned would have any problem in that environment.

It's generally a good idea to keep trees off blacktop and concrete, however, because the heat radiated back at them can cook the roots and foliage. *So as long as the trees aren't sitting directly on asphalt shingles or rooftiles, if you are comfortable for extended periods where they're located, it shouldn't be a problem. *

Shimpaku is a type of Juniper, by the way. *Among the trees you've listed it has the highest tolerance for heat and sunshine. *The problem may lie elsewhere. *Be sure you aren't overwatering.

Regards,

Matt

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