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Hi, John...
The Schomburgkia will tolerate full sun... the others would prefer a little more shade, but it depends on what time of the day they are getting the brightest light. If the plants are in direct sun during the middle of the day (say, 10:30am to about 2pm), they will probably sunburn. This is the time when they need a little shade. If they're getting early morning sun, they're probably fine.

      On your terrace the breeze is probably drying the plants more quickly than they prefer. You might have to water more often... this will help rinse any salt off the plants. The Schomburgkia is less prone to effects from the salt, as it grows in coastal areas. But even so, the plants get rinsed by the rain fairly quickly.

Hope that helps!

Julie
R.F. Orchids
     

On Sun, Aug 18, 2013 at 10:13 PM, Terrace Gardener <jmf.sofla@gmail.com> wrote:
> In the past month, I’ve bought the following from you:
>
> Schnomburgkia Thomsonia
>
> Aerides fieldingii
>
> Aeride lawrenciae
>
> Cattleytonia ‘why not’
>
> Prosthecea radiate
>
>  (I wonder if a 12 step program is going to become necessary? )
>
> Here’s my situation. I garden on my terrace (33’x12’)- south facing -
> on the 4th floor of my building.
>
> We often have a breeze coming off the ocean.  I live about a mile from
> the ocean and I know the breeze carries salty spray..
>
> Will the salt spray dehydrate the roots? Is it possible to keep plants
> free enough of salt ..enough to allow them to thrive?
>
> Does this group look to be fairly sun tolerant.. 4 hours of am sun?
>
> Thanks for any suggestions / info you can give.
>
> --
> John Ferguson
> jmf.sofla@gmail.com