I'm having poor germination rates with Honey Locust. I scarify at 190 F for 1-2 minutes followed by a 24 hour soak and they imbibe well and a few sprout within a day or two but 80-90% get a whitish, possibly green maturing crusty mold growing on them. The germination medium is coco coir, dry enough to not be able to squeeze water out. I've repeated this experiment twice and haven't seen better than a 10% germination. The same procedure worked well for black locust. however, the black locust only had ~50% imbibe from the scarification treatment but out of those that did imbibe, nearly 100% germinated within 3 days.
Any suggestions to improve my honey locust germination rates?