Roses and orchids are totally different creatures, with different nutritional demands.
There has been some evidence that stresses applied to plants can affect Ca++ content of cells, but not that applying calcium reduced stress.
Now that we know you use a pure water supply, I will agree that calcium is needed, but not specifically for raising the pH, as orchids like acidity.
Calcium needs to be given to actively growing plants as it is a critical nutrient that is not easily translocated from other parts of the plant. It is usually used in conjunction with magnesium, so it doesn't hurt to apply them together. I do so by constant application of very low doses of fertilizer that contain them (MSU RO or K-Lite, for example), rather than guessing at single-component additions.
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