Parsley is usually ready to harvest 70 to 90 days after the seeds have been planted. Planting young parsley plants instead of seeds decreases time to harvest by several weeks. Parsley seeds usually take between two and five weeks to germinate. Soaking parsley seeds for 24 hours in warm water also reduces the time it takes the seeds to germinate, explains Jill MacKenzie on the University of Minnesota Extension website.
After about 10 to 12 weeks, parsley stalks can be cut off as close to the ground as possible. Cutting the stalks in this manner encourages new plant growth. Although parsley is most flavorful when used fresh, it can be frozen or dried.