The sprangletop seeds that I have got has very low germination and those were harvested 3-4 months ago.
See:
Seed germination ecology of the annual grass Leptochloa panicea ssp. mucronata and a comparison with L. panicoides and L. fusca
Acta Oecologica 20(5):571–577 · September 1999
DOI: 10.1016/S1146-609X(00)86624-2
I hope this helps :)
Thank you for sharing, it was really helpful...
You may try priming in water. Many grasses respond well to this; however, if this technique does not work for you then the use of ethylene or gibberellic acid are also useful in breaking seed dormancy.
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