I am impressed with the wonderful patience and amount of people posting to this forum--Thanks!!! I have been trying to grow redbud from local (Northern California) seed for three years. The internet has provided a lot of comment, ie. 30 minute soak in undiluted sulfuric acid or pouring boiling water over the seed. I have tried treatment in the refrig and in the freezer I have not gotten a single sprout. I have taken mature seed from several trees in each of the 3 years so assume (erroneously?) that some should have been viable. Any suggestions? Thanks for looking!