These are grown as an annual here in zone 4a.
It is difficult to find germination information.
So far I have read that they need drier conditions in the dark.
And chilling them in slightly moist medium (not wet) for several weeks might help.
So yes a WS is a good idea. Both the Dr. Deno and the Tom Clothier data bases
recommend chilling for 6 to 8 weeks and then warmth.
I also came across the idea that perhaps a brief soak in potassium nitrate solution might hasten germination.
Also some commercial seed suppliers may "prime" some seeds?
Good luck with these and do let us know when you get germination.
