I have some catts and laelias that grow horizontally and no amount of positioning will correct it unless I grow them in a well about as big as the pot. Some grow this way because their genetic makeup guides them. That is why I put rocks, stakes, or walls in front of them to force them to grow at the angle I want them to. It's not the position of the light source because I put mine in different places all the time and my light source is mostly straight overhead for most of the day. It's in the genes for the most part.
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