I have just germinated some of these from my own plants. They came up in about a week. I did it as an experiment because I haven't always had overwhelming success with spring-sown commercial seed.
My 'bible' book on propagation suggests sowing Thalictrum during Feb/March. If you have plenty of seed why not sow some now and put in a sheltered spot outside and sow the rest next year. They do not require additional heat.
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