| A few thoughts:
1) Orchids over grow pots. It's a fact of orchid life. With Cattleyas, which can grow 2 or more cycles in one year, an over grown plant could be as simple as choosing not to repot for as little as 6 months to a year. I disagree that an overgrown plant is the emergency, the sign of neglect, the book makes it out to be. Especially since some cattleyas can grow so freaking fast. Your plant looks healthy and the roots look good, at least what I can see form the pic. No emergency from what I can see.
Therefore normal repotting seems to be in order.
2) When they say pot in spring, I think they are saying repot when thenew growth cycle starts. This is the time Cynthia (and others) prefer, when new roots are coming.
3) I dissagree that the ONLY time to repot is when new roots have started. I regularly repot my Cattleya Alliance orchids after they bloom, when they spend a few weeks doing nothing before new growth starts. Some says this damages roots and sets the plant back: in my experience this is simply not true. My cattleyas do not miss a beat. I also do not like the idea of repotting when there are tender new roots to be damaged. Damaging these roots will set your plant back, so why risk the damage if it is not necessary?
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