Italian, or flat-leaved, parsley is a favorite for pasta dishes and has a stronger flavor than curly leaf parsley. It is usually grown as an annual but it is actually a biennial, producing yellow or green flowers the second year attractive to pollinators. It is also a host plant for the swallowtail butterfly.  After flowering the second year, the biennial then dies but will self-seed. Prompt removal of the flower spikes as they appear will help prolong the foliage life. If left alone, it will self-seed. 
Start  indoors 6-8 weeks before last spring frost date planting 1/4" deep, or direct sow after last frost date.  Soaking in warm water 24-36 hours can improve germination.