The perennial shrub, Thyme, certainly deserves a place in every herb garden. Not only is it one of the most useful plants in the kitchen, but it also has attractive foliage, long-lasting flowers and it's an easy-to-care-for compact plant. English Thyme is used most often in cooking. Types of culinary Thyme include Thymus Vulgaris, also referred to as Common Thyme, and include summer, winter, and French Thyme. Starting Thyme From Seed Thyme seeds are difficult and slow to germinate, but it can be done. It will take a year to get a good-sized plant. Seed Longevity: 2 years. Seed Sowing Depth: Cover thinly. Best Soil Temp for Germination: 70 degrees. Days to Germination: 7-10+ days. Spring Sowing Sow indoors 6-10 weeks before the last spring frost. Plant outside 2-3 weeks before the first last spring frost.