Dear Dennis, I looked up Psoralea which I did not know, it is a Fabaceae. For Fabaceae seed I always use very hot almost boiling water which I pour over the seed, about half a cup full so that it cools down relatively fast. Same thing I do with Malvaceae seed. (I admit that I am scared to kill the seed every time I do that and am ALWAYS amazed how well it works) Sometimes this procedure has to be repeated. Those seeds that start to swell and double or triple their size are good to sow and will germinate within days, Those which do not react are mistreated again, and maybe again. The ordinary Lupinus polyphyllus needs that, too. If you do not trust this treatment just do it on a few seeds and keep the rest. Fabaceae dislike very much root disturbance and grow in symbiosis with certain bacteria so your idea to sow the seed where the plant is to grow is probably the best way. But make sure mice and birds and the like do not discover the seed. Some Fabaceae are extremely lime dependent and will therefore not grow in lime free soil. If you are not sure or if you do not want to add lime to your soil try finely crushed egg shells. ..... hope this is not too much off topic.... Uli