Herbs

How to Grow and Care for Lemon Thyme

Lemon thyme (Thymus citriodorus), is a Mediterranean herb that has been used for centuries. Once believed to be a hybrid of garden origin, between Thymus pulegioides and Thymus vulgaris, it has since received its classification after DNA analysis revealed it....

is its own species (Thymus citriodorus).

The aesthetic appeal and the many uses of lemon thyme in garden design are reason enough to plant this aromatic treasure. Using lemon thyme in a garden can bring interest and appeal in various ways. Lemon thyme makes an excellent border plant in a rock garden and thrives in those conditions. If looking to xeriscape, thyme is perfect and will provide color when it flowers, or, depending on the cultivar, can add yellows and lime greens.

Whether you are growing lemon thyme for culinary or ornamental uses in a fixed spot in your landscape or a container, this olfactory delight is relatively carefree.
Lemon Thyme Care
Here are the primary care requirements for growing lemon thyme:

Plant outdoors in the garden or a container in full sun. Grow indoors only if you have a spot with bright light.
Keep in a warm, dry climate and make sure your soil is well-draining.
Water this citrusy herb every few weeks.
Harvest before the plant flowers in the early summer or pick the lemon lemony leaves from spring until the first frost.
Light
Lemon thyme demands bright, sunny locations that recall its origins. It will tolerate some shade, but it will never thrive and give its best foliage or aroma in anything but full sun. If your yard lacks a location that gets full sun, lemon thyme grows wonderfully in containers and can be kept on a sunny window sill.

Soil
When considering ideal soil conditions for lemon thyme, consider its native conditions. In thyme’s case, this would be the dry, sandy, rocky limestone mountainsides of the Mediterranean. This environment creates the perfect dry, alkaline soil for growing lemon thyme. While these conditions are ideal, lemon thyme and many Mediterranean herbs will grow in almost any soil since they are adapted to growing in rocky, infertile soil.

Water
Watering lemon thyme is a low-maintenance affair. It prefers dry conditions, so watering it weekly or even every few weeks is fine. Once the soil is truly dry to the touch, water it until it's drenched.

Temperature and Humidity
Lemon thyme thrives in warm, dry weather, so it reaches its peak performance during the summer. This is when you will see the lovely lilac flowers bloom, as well as reap the benefit of the volatile lemony essential oils released by the warm air. It will go dormant during the cooler months but may remain green throughout the year in all but the coldest climates.

Fertilizer
Treating herbs, not just lemon thyme, with fertilizer is often a bad idea. Add some organic compost when planting to proactively encourage vigorous growth.

Pruning
Lemon thyme is a hybrid plant prone to spreading. Clip it back after it flowers with a clean, sharp pair of shears to control the spread and encourage new growth. When pruning, keep it compact with plenty of fresh leaves. If you leave lemon thyme untrimmed, it will become leggy and woody at the base.

Propagating Lemon Thyme
Once you have an established plant, you can easily propagate thyme. Cutting is a common propagation method.

Cut a stem section 4 inches long with sterile scissors or snips just below the leaf node.
Remove the leaves below the node, then submerge the stem of the cutting in distilled water. Put the cuttings in a place that gets plenty of light.
Wait a few weeks for the plant’s roots to begin developing. Once a good root system develops, transplant it into a pot to grow further.
Alternatively, you can dip cuttings in a rooting hormone and push them into seed-starting soil. Keep the soil moist, and within a few weeks, the plant's roots will begin to develop.

How to Grow Lemon Thyme From Seed
Growing lemon thyme from seed is possible, but it is often slow to germinate.

Place two to three seeds per cell in a seed-starting tray filled with seed-starting medium. Keep the medium consistently moist. Use a domed cover to keep the seeds and soil warm and moist. Put the trays in a bright window or under a grow light on a heating mat.
Remove the dome once your seeds have germinated. Place a small fan beside the tray to allow indirect air to flow over the seedlings at all times. The constant pressure from the air creates more robust plants and root systems.
Move them into pots to allow them to mature a little before planting outdoors.
Harden off the seedlings before you take them outside after the first frost.
Potting and Repotting Lemon Thyme
If you plan to propagate thyme or want to grow thyme in a container rather than in the garden, having an excellent potting mix is essential. Start with a base of three parts seed mix, two parts compost, one part vermiculite, and one part topsoil. This mix will give you the suitable organics, draining, aeration, moisture retention, and texture for your herb to be happy.

Overwintering
Lemon thyme is very hardy and can survive the winter, but a little extra protection won't hurt, especially if it is a wet winter, as the herb does not like being wet. A good pruning and a 2- to 3-inch layer of mulch around the roots will offer extra warmth. If lemon thyme is grown in a pot, it can be brought indoors over the winter. Water it slightly and place it in a window with plenty of natural light.

Common Pests & Plant Diseases
Lemon thyme may be plagued by spider mites, ants, and aphids, which can be found on new plant growth and the underside of leaves. Eradicate them with water or insecticidal soap. An added benefit of having lemon thyme in your garden is that it repels mosquitoes and attracts bees for pollination. It is also resistant to deer.

The herb is most susceptible to root rot and Alternaria blight, the latter of which can see dark brown to black spots on leaves. If not taken care of, the spots spread, and leaves are killed.

Common Problems With Lemon Thyme
Lemon thyme is a very easy-to-care-for plant with few problems. As long as it is kept dry and given plenty of sunlight, it will grow plentifully for seasons to come.