Sorry for my lack of knowledge but how does orchid sizing work?
I have found several sites advertising "size c plants" but I am little confused as to how this differs from size B and why is there no size A? I have done a quick search but nothing is coming up. Is this a common system
I have never heard them classified that way. Usually it is seedling, near blooming, previously bloomed, etc. Or they will say young plant that should bloom in a year or two.
The websites I've seen this type of sizing on usually list the pot size that the letters equate to somewhere on their websites. You may need to check the pricing/ordering pages on their website/catalogue to find the pricing codes.