| I think it is an excellent question too!!
As PhalPal and phalaephila suggested there will be some limitations seen in individual plants because of genetics. But in many cases 'nurture' couldd influence the number of leaves on an orchid.
I think kmarch is right about the care. Since my experience with orchids is limited I can only write about what I have observed in my Phals. during re-potting.
I think when the root system is extensive the Phals. seem to have more leaves. I have a few Phals. that have 10 or more leaves and they have considerable root development. Most of the others are younger and I can see the trend right now.A few of them have started to grow new leaves before the previous ones have fully matured.
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