I left a dozen in the sun (still being in Spring) and they're yellow and brown. This Saturday has a forecast for 40c and there's very little cloud around, so I'd love to get lower than 70% but will likely be out there stressing - when I have my hands full with my greenhouses overheating. I need the Cym's to be the easygoing low maintenance orchids so I can keep my deflaskees alive
Does the same apply to plastic sheeting for walls? I'm going for white on the same principle, and that the two tone of green plastic and white shadecloth will look strange.