I have just read the report that says salad leaves mixtures will not be available after this season because of a European directive. Which means to get the scrumptious salads I am now enjoying i will have to buy many packets of seeds. Mixed lettuce will still be available but this is not the same. i love the peppery, mustardy, bitter and sweet bitefuls you can get from growing the mixture. Does anyone know how long those kind of seeds are viable for as I am hoping to be able to stock up wth some packets?