so many factors are left out.gentic mutation could be one of them,who knows.for better responses go to the search button and look up trouble shooting form,fill it out and post it here.this is your only real chance of getting an answer,my guess just off the top of my head is the soil your using is to hot.however with out this form you s.o.l ...good luck, the sooner you fill it out the sooner you will get your responses.:thumbsup: