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Originally Posted by Attila
For azaleas, I've seen 50% at Nuccio's azalea nursery. He uses a lattice, 2 inches wide, placed 2 inches apart. Theoretically this would correspond to 50%, but if placed very high, it actually allows more than 50% sun. That's because the light is reflected several times between the ground and the lattice.
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That is old school Attila. I know the concept of shade cloth is easier to deal with but the version of lattice spacing you mention as well as other variables can be a better option that plain old shade cloth.
For instance if you orient 2" wide boards 2" apart placed flat or parallel to the ground with the spaces running east to west you get a completely different amount of sun than if you do the spaces running north to south. The coolest one I saw had what appeared to be 1x6 lumber at a 35 to 40 degree angle. The openings faced due east so morning sun was allowed in these "blinds" but noon and later sun was effectively blocked from coming in all but the slightest gap created with the spacing of the boards. Perhaps too complicated for most people but effectively allows varying amounts of sun in, and if done properly only the good sun (morning sun).
Thought it was worth adding to your latice comment.