Whatever you do, don't cut the yellow ones!! As long as they are still firm, they are fine. Only remove hollow or mushy roots. Phal roots can photosynthsize, so if they are exposed to light (like the roots visible through clear pots) they are green. Roots in the center of the pot get no light, so stay yellow. As for the pot sizr, use the smallest size the roots will fit it. Unless yours has lost many roots to rot, it should fit in the same size pot. If there are alot of roots, going up just one size is enough.
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Camille
Completely orchid obsessed and loving every minute of it....
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