How to grow thyme from seeds or cuttings

Thyme is a must for all home cooks. Use thyme with meat and fish as well as vegetarian dishes or as a base in your spice mixes. It’s also an easy and forgiving herb to grow and look after. 

Even better, as a perennial, your thyme plant will come back every year as long as you give the plant some love and care. 

In this article, we will show you how to grow thyme from seed, cuttings, or division and how to succeed in growing and cultivating your thyme plants.

Thyme Varieties, Aroma And Color

Thyme is a part of a large family of herbs, including varieties like English, French, Silver, Lemon, and then, of course, the most popular – common thyme or Thymus Vulgaris.

And if you want to grow thyme for the first time, I recommend you start with common thyme. 

Thyme is a low-growing perennial bush-like plant with long stems covered with small, oval green to gray-green leaves. When thyme flowers, the plant produces small delicate white, pink, or even red flowers that are favorites among pollinators like bees.

Thyme plant with white delicate flowers
White flowers on thyme

The branches grow stiff and wooden as the plant matures. Mature thyme plants benefit from being harvested continuously throughout the growing season. 

Thyme is a very aromatic herb, and low-growing creeping varieties are known to be planted in between paving stones in English gardens. The leaves emit a wonderful scent should they occasionally be stepped on. 

Thyme is best added to your dishes early in the cooking process and provides a rich and earthy flavor with floral undertones. 

It takes a bit of patience to grow thyme from seed. You will be able to harvest the plant the first year, but the yield will be much richer in years two and onwards.

You can also grow thyme from cuttings or divisions to speed up the process.

If you grow from seed, you start propagating indoors in starter pots in early spring. 

How to grow thyme in 15 easy-to-follow steps

1. The first step is to buy quality seeds and potting soil from your local garden center.

2. Choose the plastic starter pots or a propagation tray you want to use. Wash them carefully if you reuse pots or containers from other gardening projects. Make sure the containers have rain holes to provide good drainage.

3. Fill the chosen pot with your potting soil. The seed contains all the energy needed to germinate, so no fertilizer is required. Water the soil and let all excess water drain out.

Watering thoroughly before we plant the seeds will help remove any air pockets in the soil and prevent the seeds being flooded and gathering in lumps. 

4. Sprinkle the seeds sparingly on top of the soil and try to leave some space between each seed. Remember, one seed equals one potential plant.

5. Cover the seeds with a thin layer of soil and press gently with your fingers to ensure solid contact between soil and seeds. Spray the soil with water and cover the container with a plastic film (or lid). 

6. Place the container in a warm – not hot – place and keep the soil moist. If you see condensation forming, you need to make some holes in the plastic film to provide better air circulation. 

7. Thyme seeds can be slow to germinate, but after approximately 21 days, you should start seeing the first leaves forming. Remove the plastic film, and make sure you continue to keep the soil moist. Keep the container in a warm place with plenty of sunlight. 

At this stage you want a warm environment of 18-22 degrees Celsius (64-70 degrees Fahrenheit) with plenty of sunlight (at least 6 hours per day). But do not place the pots in direct sunlight as you risk scorching the seedlings. 

8. When the seedlings have grown at least two sets of true leaves, it is time to transplant them into larger pots or containers. Fill the new pots with nutrient-rich potting soil.

9. Lift the seedlings gently, taking great care not to damage the root system, and plant them to the same depth as before. Leave approximately 10 cm (4 inches) between seedlings as you plant them. If you use nutrient-rich soil, you do not have to add any fertilizer.

9. As the seedlings grow, you can increase their exposure to sunlight. Mature thyme plants will thrive in full sun with good air circulation.

Thyme seedlings with several sets of true leaves
Thyme seedlings with true leaves

10. When there is no longer any risk of frost, you can replant the thyme plants in your herb garden or place the pots outdoors. You should always harden your plants for 1-2 weeks by incrementally increasing their outdoor time.

11. As the thyme plant grows, you should harvest continually by pinching twigs 3-6 cm (1-2 inches) above ground level. Continually harvesting your plant will create new growth and result in a busier and healthier plant.

12. If you are harvesting your whole plant for storage, you should wait for the plant to start setting flowers. Cut it back, leaving 3-6 cm (1-2 inches), and watch the plant grow back. Use a standard herb fertilizer at half the recommended dosage to boost your plant.

13. Thyme is a hardy plant, and the most common problem you may encounter is root rot due to overwatering or poorly drained and compact soil with no air. Thyme prefers a mild dry out between waterings to being watered too much or too frequently.

The more common pests include aphids and red spider mites. Early detection and treatment with Neem Oil will help save your plant.

14. To help your plant stay healthy over winter, you need to ensure good drainage and apply a cover of mulch around the bottom of the plant as the weather gets cold. Do not apply the mulch too early in the fall, as you may overheat the root system.

15. After a few seasons, your thyme plant may develop woody branches. Cutting the plant back hard in the spring leaving only 3 cm (1 inch), can help rejuvenate your plant. 

Grow thyme plants from cuttings

You need an established and mature plant to grow thyme plants from cuttings.

Look for a branch with new growth and cut a sprig measuring about 15 cm (6 inches). 

Next, strip off the leaves from the bottom part of the sprig (5 cm/2 inches). 

Place the sprig in a glass of water and place the glass in a warm but not hot place.

Replace the water every two days or so or when the water gets dark or murky.

In 1-2 weeks, you will see fresh white roots forming, and the cutting will be ready to plant into a pot with rich, well-drained potting soil.

Grow thyme plants by division

Growing a new thyme plant from the division is a very straightforward process.

You start with a mature and established plant and lift it from the ground or pot.

Next, grab the plant by the root and gently but firmly divide the plant into two or more separate plants.

When the plants are divided, plant each division in a separate pot or location, leaving a space of around 20 cm (8 inches) between the plants. Press to firm up the soil around the plant but avoid pressing right on the root systems. Finally, water the plants thoroughly.

Harvesting Thyme

Harvesting thyme is as simple as cutting off sprigs or branches as needed.

You can also harvest the entire plant to preserve herbs for future use. 

Drying Thyme

There are several ways to dry your thyme after harvest. 

You can tie branches of thyme together and place them in a brown paper bag. Hang the bag upside down in a cool, dark location with good ventilation.

Depending on external factors like temperature and humidity, it can take several weeks for the branches to dry.

When dry, remove the leaves from the branches using your fingers and store them in an airtight container. 

You can, of course, also use a food dehydrator. Depending on the model, it can take 1-20 hours to dry your thyme in a food dehydrator. 

Freezing thyme

You can freeze entire thyme sprigs or remove and freeze the leaves in a plastic bag or container.

Cut the amount of thyme you intend to freeze. It is optional to rinse and wash the thyme. If you wash your thyme, leave it on the branch while washing and drying the herb.

The thyme must be dry before you freeze it. 

You can remove the dry leaves from the branch or freeze the entire branch with leaves and all.

Place the thyme in a plastic bag or container and remove as much air as possible.

Seal the bag or container and place it in your freezer for storage. 

Summary and conclusion

Thyme is one of those herbs that can be used for almost any type of cooking. You can use it with meat, fish as well as vegetarian cooking.

Thyme growing alongside peppermint and rosemary
Peppermint, thyme, and rosemary in my herb garden

Thyme can be grown from seeds, cuttings, or by division from an established plant. You can, of course, also start by buying a small plant from your local garden store if you prefer.

Thyme is a perennial, and propagating a healthy plant can start a long and fruitful relationship. 

Thyme is very hardy and will tolerate the occasional mild dry out and even poor soil. But thyme will not tolerate overwatering or compact and poorly drained soil. 

Helpful sources:
University of Illinois Extension

Planttalk Colorado™ sponsored by Colorado State University Extension, Denver Botanic gardens, and the Green Industries of Colorado  

Meet the author: Mattias is an experienced gardener spending most of his free time on his knees among herbs, plants, and garden vegetables. For the past two years, he has been sharing gardening projects and how-to tutorials on the NordicLavender website and YouTube channel.