Potted Iris (!)

So far, the info suggests using 5-gal. pots and a well-draining mix.  Being
in pots I am assuming that they will need watering more often than in the
ground -- right?  Any suggestions on how to avoid the black plastic pots
heating up during our hot dry summers which are usually high 80s, 90s and
into the low 100s?  I don't want to go to the expense of purchasing more
expensive cache pots (is that the correct term?), but can't think of a way
to keep black plastic from heating up.  (No, I am not going to move each one
of them every day into the shade during the middle of the day!)  The west
side of the property shaded in the afternoon by neighboring trees is devoted
to a 150' manmade rocky stream bed (to control runoff down the slope from
heavy winter rains) which is planted on both sides with California natives.

At this point my choice is to either take up space on my small lath-covered
east-facing deck or line them up along the neighbor's fence on the east --
but of course that gets both noonday and hot afternoon sun!  What to do,
what to do!!??

Dorothy C. Frisbie
Woman of Many Interests
Escondido, CA
AIS Region 15, Sunset Zone 20/21
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