DEAR SIR: As I look out at the rain on another morning in the worst spring weather that I have seen, my mind goes back to spring 2013. That was another year with incredibly challenging weather and one that I will not forget.I ran out of silage on 1 March 2013. This was an inconvenience but not an immediate crisis as there was plenty of silage around. However, the weather got worse and grass growth never arrived. Silage stocks on every farm became a problem.