These are the germination suggestions from Gardens North
(OT - a very good reliable source for fresh and many unusual seeds even though being Canadian, purchasing a phytosanitary certificate for shipping is required)

"This species responds dramatically to GA-3. When treated, germination is in 2-4 weeks at warm. Without GA-3, keep seed warm for 3 months, followed by cold (summer sown, left out over winter accomplishes this simply)."

Your Fall sowing may have been a little late for 90 days warm preceding the chill.

Hey-thanks for the info.