Since it's all about meeting the objective of a wet-dry cycle, sphag is as good as any other medium if that's what the plant gets. So no surprise that it can work on Catts, especially little ones. In a larger pot it tends to stay wet for too long. But the little ones dry out fast. I use it for lots of things in baskets - again, watering frequency and air movement allow the plants to dry out. An advantage, especially in net pots (plastic baskets) - it doesn't fall out of the holes the way bark tends to do. So, no reason not to use it just because you're potting Catts... You just may have to approach watering a bit differently than you would if it were bark to get the same effect.
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