Last year (spring) when I was roughing out gardens I set aside an area for herbs. Have never grown any herbs at all before. Planted 2 curly leaf parsley and they produced copious bunches of lovely leaves last year. I juice them and love getting bunches of fresh leaves. We don't get overly cold here so they actually sort of grew all winter sufficient for me to pick and use. This spring they both went to seed. Not sure why I did it but initially I pulled the seed heads off thinking this would stop the process of going to seed and they'd start producing leaves again but no cigar. Now we're into almost the second week of July and they're huge but still all gone to seed. Is this normal? Should I expect this? Should I be cutting all the seed heads off? Leaving them alone?