As tarragon is a perennial herb, it can be harvested up until late August. Be advised to stop harvestingtarragonherbs one month before the frost date for your area. How to Plant an Established Tarragon Plant. Tarragon is unique among herbs in that it cannot be grown from seed—French tarragon seeds are sterile and will never germinate. Tarragon is a delicate herb, so to be sure you won’t damage the leaves, cut the parts you want using clean scissors, as this will be the easiest and safest method. Tarragon thrives in well-drained soil and prefers a sunny location. It can be propagated through division or cuttings, as seeds are often sterile. The herb should be harvested in the... Photo by Lorna Kring. And because tarragon is one of the first herbs to appear after winter, the harvest can start in early spring by pinching out the growing tips. Harvest your tarragon early in the morning. All herbs, including tarragon, are best harvested around sunrise, before the morning dew evaporates. Tarragon adds richness to a variety of dishes. Learn how to grow this flavorful herb — and its substitute, Mexican tarragon — in your own garden. As with most other herbs, tarragon is cultivated for its flavorful leaves rich in essential oils. How do you know when to harvesttarragon though? Click this article to find out about tarragon... Tarragon is a perennial herb with a light, fresh taste that resembles licorice. Learn how to plant, grow, and harvest this French-favorite here! Tarragon is a herb with a distinctive anise or licorice flavor.Mediterranean herbs are easy, multi-harvest plants for fresh use, drying, teas, and medicines.