I asked Fruitwood Nursery how they go about rooting loquat cuttings, since they sell rooted plugs. Here was Marc’s answer, in case anyone else wants to try this method:
We usually get at least 50% takes when we root them in our propagation greenhouse that has a light shade and sprinklers that go off 4 times a day for a short period. Nothing fancy. We do dip them in rooting hormone before sticking them into a 50/50% peat/perlite mix.
Best,
Marc