Lemon verbena in winter: a complete guide to protecting it

Winter lemon verbena : this Mediterranean plant is sensitive to frost and requires specific care from autumn onwards to survive the cold season without damage.

• Lemon verbena does not tolerate prolonged negative temperatures well.
• When potted, it should be overwintered in a frost-free, bright and well-ventilated location.
• In open ground, a thick layer of mulch protects the roots from the cold.
• Late winter pruning (February-March) prepares for spring growth.
• A plant that has overwintered well will resume vigorous growth as soon as the good weather returns.

Why is lemon verbena sensitive to winter?

Lemon verbena, botanically known as Lippia citriodora, originates from the warm regions of South America. It was introduced to Europe via the Mediterranean countries, where the mild climate suits it perfectly. Its sensitivity to cold is therefore inherent: its plant tissues are not adapted to withstand prolonged periods of sub-zero temperatures.

As soon as the temperature drops below freezing, the plant's cells can burst due to the crystallization of the water they contain. The stems then appear dead, the leaves fall off, and the plant enters a state of deep dormancy. If the roots are protected, recovery is still possible in the spring. But if the frost reaches the base of the plant, the loss is often irreversible.

Understanding this fragility allows us to adapt our practices as early as autumn. Why lemon verbena leaves turn yellow is a common question at this time of year, often linked to the first nighttime chills that herald winter.

When to prepare lemon verbena for winter?

Preparing lemon verbena for winter begins as soon as summer ends, when the nights get cooler. Generally, it's best to act before the first frosts, which occur between October and December depending on the region. Don't wait for the first frost to take action: the plant can be weakened even by temperatures close to freezing without visible frost.

In September and October, gradually reduce watering to slow growth and prepare the plant for dormancy. If it's in a pot, now is the time to bring it indoors or move it to a sheltered location. If it's planted in the ground, start gathering the necessary mulch.

Anticipation is key. A plant surprised by a sudden cold snap recovers much less well than a plant gradually prepared for falling temperatures.

Overwintering in a pot: the step-by-step method

Lemon verbena in a pot is in the best position for winter, as it allows you to move the plant indoors. Here's how to do it effectively:

1. Bring the pot indoors before the first frosts, ideally when nights regularly drop below 5°C.
2. Choose a frost-free, bright location: an unheated veranda, a garage with a window, a cold greenhouse or a bright corridor are perfectly suitable.
3. Reduce watering to the bare minimum throughout the winter period: the plant is dormant and its water needs are very low.
4. Avoid rooms heated above 15°C: excessive heat in winter disrupts the plant's natural cycle and weakens it for the following season.
5. Check from time to time that the substrate is not completely dry: light watering every two to three weeks is sufficient.
6. Do not fertilize during winter: the plant does not need it and an excess of nitrogen in winter can promote fungal diseases.

To learn more about year-round care for potted lemon verbena, see our guide on caring for potted lemon verbena, which details the essential steps season by season.

Overwintering in open ground: protect the roots from frost

Winter lemon verbena planted directly in the ground is possible in regions with mild climates (climate zone 8 or higher, with winters rarely dropping below -5°C). In colder regions, the risk of total loss is high without adequate protection.

The main technique is mulching. Place a generous layer of organic matter (dead leaves, straw, wood chips) around the base of the plant, at least 15 to 20 cm thick. This mulch acts as thermal insulation and protects the roots from sudden temperature changes.

You can also wrap the base of the stems with horticultural fleece or burlap. This protects the above-ground parts from the harshest frosts. If severe cold is forecast, a double layer of fleece is recommended.

Even with all these precautions, the above-ground stems can freeze and turn black. This isn't necessarily fatal: if the roots are healthy, the plant will regrow from the base in spring. Wait before pruning or pulling it up: wait for the first signs of recovery to assess the plant's true condition.

Winter pruning: when and how to do it?

Pruning lemon verbena in winter is an essential step to encourage healthy spring growth. It should be done in late winter, ideally in February or March, depending on your region. Pruning too early exposes the cuts to frost; pruning too late delays regrowth.

The recommended method is to shorten the branches, leaving 5 to 10 cm of stem above the ground or the woody base. This severe pruning may seem drastic, but it stimulates the growth of vigorous new shoots. Use clean, sharp pruning shears to avoid crushing the stems.

After pruning, you can add a light organic amendment around the base of the plant to help it recover. Wait for the first green shoots to appear before resuming regular watering.

If you wish to take advantage of pruning to propagate your plant, you should know that the stems you take can be used to make cuttings. Our article on propagating lemon verbena explains how to do this step by step.

Recognizing a dormant or dead lemon verbena

One of the most stressful moments for a gardener is looking at their winter lemon verbena with black, leafless stems, unsure whether the plant is dead or simply dormant. Here's how to distinguish between the two.

Lightly scrape the bark of a stem with your fingernail or a knife: if the underlying tissue is green or slightly damp, the stem is alive. If it is brown, dry, and crumbly throughout, it is dead. Repeat this process on several stems and on the base of the plant.

If the base is alive but the stems are dead, prune the dead stems and wait. The plant will regrow from the base. If the base itself is dead, the plant will not regrow. In this case, it's time to replant.

Mistakes to avoid during winter storage

Some common mistakes can compromise the survival of your lemon verbena during winter. Knowing them makes them easy to avoid.

• Overwatering in winter: in dormancy, the plant absorbs almost no water. Excess moisture promotes root rot.
• Placing the pot in a room that is too warm: the artificial heat disrupts dormancy and weakens the plant for the following season.
• Pruning too early: pruning in December or January exposes the wounds to winter frost.
• Pulling up a plant too quickly: a plant that appears dead in January may very well sprout again in April. Wait before concluding.
• Forget about mulching in open ground: without protection, the roots can freeze during a sudden cold spell.
• Fertilizing in winter: unnecessary and potentially harmful, it can promote diseases.

The spring recovery: how to support it?

After a good winter growth of lemon verbena, the spring regrowth is usually spectacular. As soon as temperatures rise consistently above 10°C, the first green shoots appear at the base of the stems or directly from the soil.

This is the signal to gradually resume watering and to add a balanced fertilizer or mature compost to the base of the plant. Gradually return the pot to the outdoors, starting with daytime exposure to avoid thermal shock.

If you have overwintered your plant in a pot and wish to transplant it into open ground in the spring, our guide on how to plant lemon verbena will give you all the keys to successfully complete this step.

Should lemon verbena be brought indoors every winter?

The question arises every autumn: is it really necessary to bring your lemon verbena indoors for the winter, or can it be left outside? The answer depends mainly on your region and the severity of local winters.

In the south of France, on the Atlantic coast or in Brittany, mild winters sometimes allow the plant to be left in the ground with just a simple layer of mulch. In the north, east, or at higher altitudes, the risk of severe frost is too great to forgo serious protection or overwintering indoors.

If you are hesitating between keeping your lemon verbena and opting for another aromatic plant, our lemon verbena vs. lemon verbena will help you choose the plant best suited to your garden and climate.

Can lemon verbena be kept indoors all year round?

Some gardeners choose to grow their lemon verbena indoors year-round to avoid the challenges of cold weather. While technically possible, this plant needs plenty of light to thrive. A spot in front of a large, south-facing window is essential.

When kept indoors permanently, the plant grows less vigorously than outdoors and can be more susceptible to pests such as spider mites, which thrive in the dry air of heated interiors. Regularly misting the leaves with water helps maintain sufficient humidity.

The ideal solution is to put the plant outside in the spring to provide it with the light and temperature conditions it needs to grow fully, then bring it back inside in the fall to protect it from the cold.

Lemon verbena in winter: uses of the dried leaves

Overwintering is also a good time to enjoy the leaves harvested at the end of the season. Before pruning or bringing the plant indoors, pick the still-healthy leaves and dry them in a dark, dry, and well-ventilated place. Once dried, they will retain their lemony scent for several months.

These dried leaves can be used to make infusions, flavor dishes, or create aromatic sachets. It's a way to extend the benefits of your plant well beyond the growing season.

If you would like to learn more about the repellent uses of this plant, our article on lemon verbena mosquito repellent details how to exploit its natural aromatic properties.

Precautions and contraindications to be aware of

Winter lemon verbena does not present any particular danger when handled for overwintering. However, like any aromatic plant, it can cause skin reactions in people with sensitive skin upon prolonged contact with fresh leaves. Wearing gloves is recommended for those prone to contact allergies.

Regarding consumption, if you use the leaves in infusions or cooking, certain precautions are necessary. Our article dedicated to the contraindications of lemon verbena lists the situations in which it is advisable to seek the advice of a healthcare professional before consuming this plant regularly.

Information on the safety of this plant is limited. If in doubt, especially for pregnant women, children, or people undergoing medical treatment, consult a doctor or pharmacist.

How to preserve lemon verbena from one year to the next?

The longevity of lemon verbena, winter after winter, depends on the regularity of its care. A plant that is well overwintered each year can live for many seasons and develop into a truly aromatic shrub over time. Experienced gardeners report plants that have survived for more than ten years in pots with careful overwintering.

The key is consistency: bring the plant indoors at the right time each autumn, prune at the right time each late winter, and gradually resume care each spring. These simple actions, repeated year after year, make the difference between a plant that weakens and one that thrives.

For everything related to preserving this plant from one season to the next, our comprehensive guide on how to keep verbena through the winter provides practical and detailed advice.

Frequently asked questions about lemon verbena for winter

Can lemon verbena survive winter in open ground?

Yes, in mild climates, lemon verbena can be grown outdoors in winter with a thick layer of mulch to protect the roots. In colder regions, the risk of total loss is high without additional protection such as a winter fleece. The above-ground stems often freeze, but if the roots are healthy, the plant will regrow from the base in spring. Be patient before concluding that it is a lost cause.

At what temperature is lemon verbena in danger?

Lemon verbena begins to suffer as soon as temperatures drop below freezing for an extended period. Light, passing frosts can be tolerated if the plant is well-established and protected. Intense or prolonged periods of cold are generally fatal to the above-ground parts, and potentially to the roots if the soil freezes deeply. Preventive protection is always preferable to curative treatment after damage has occurred.

When to bring lemon verbena indoors for winter?

It is advisable to bring lemon verbena indoors for the winter before the first frosts, generally between October and November depending on the region. Don't wait for the first visible damage to take action. As soon as nighttime temperatures regularly drop below 5°C (41°F), it's time to move the pot to a bright, frost-free location. Taking preventative measures protects the plant from sudden temperature stress that would weaken it for the following season.

Should lemon verbena be pruned before or after winter?

The main pruning is done in late winter, in February or March, and not before. Pruning before winter exposes the cuts to frost and can weaken the plant. Light shaping in the autumn is possible, but severe pruning to 5-10 cm is reserved for the end of the cold season, just before new growth begins. This is when the plant will benefit most from this stimulation.

Can lemon verbena be left outside in winter?

Leaving lemon verbena outdoors without protection during the winter is risky in most regions of France. In pots, the risk is even higher because the roots are less insulated than in the ground. Only very mild regions, with no frost or very rare frosts, allow the plant to be left outside with just a light layer of mulch. When in doubt, bring it indoors: prevention is better than losing a plant that can live for many years.

How can I tell if my lemon verbena has died after winter?

To check if your winter lemon verbena has survived, gently scrape the bark of a stem with your fingernail. If the underlying tissue is green or slightly damp, the stem is alive. If it's brown and dry throughout, it's dead. Also check the base of the plant: if it's still green, the plant will regrow even if all the above-ground stems have frozen. Wait until April before making a definitive determination.

How much water should I give lemon verbena in winter?

During winter dormancy, lemon verbena has very low water requirements. In a pot in a frost-free location, light watering every two to three weeks is generally sufficient, just enough to prevent the potting mix from drying out completely. In the ground, no watering is necessary except in cases of exceptional winter drought. Overwatering in winter promotes root rot, which is one of the main causes of plant loss during this period.

Can lemon verbena cuttings be propagated in winter?

Lemon verbena cuttings root best in spring or summer when the plant is actively growing. In winter, the plant is dormant, and the stems are not in the best condition to root. If you wish to propagate your plant, take advantage of late winter pruning in March to take cuttings that are just beginning to bud. These spring cuttings root more easily and give better results.

Does lemon verbena normally lose its leaves during winter?

Yes, leaf drop in autumn and winter is perfectly normal for lemon verbena. This plant is semi-deciduous to deciduous: it loses its leaves when temperatures drop, which is part of its natural dormancy cycle. A plant that loses its leaves in winter isn't necessarily diseased or dead. If the stems remain supple and green under the bark, the plant is healthy and will regrow in the spring.

What location is best for overwintering potted lemon verbena?

To overwinter potted lemon verbena, choose a location that maintains a positive temperature, ideally between 5 and 12°C, and receives plenty of natural light. An unheated conservatory, a garage with a south-facing window, a cold greenhouse, or a bright hallway are all suitable. Avoid dark cellars or rooms heated above 15-18°C, as these disrupt dormancy and weaken the plant for the following season.

Should lemon verbena be fertilized in winter?

No, fertilizing is unnecessary and not recommended during the winter dormancy of lemon verbena. During this period, the plant does not absorb nutrients, and applying fertilizer can encourage fungal diseases or burn the roots. Wait until the first shoots appear in spring before resuming fertilization. Mature compost or a balanced fertilizer applied at the start of the growing season will effectively support growth in the new season.

Can winter lemon verbena be grown on a balcony?

Yes, growing lemon verbena on a balcony in winter is perfectly possible, provided it receives adequate protection. In a pot on an exposed balcony, the roots are particularly vulnerable to frost because the pot isn't insulated by the surrounding soil. Wrap the pot in burlap or bubble wrap, and bring it indoors as soon as temperatures drop below freezing. A sheltered balcony with good southern exposure offers better conditions than a north-facing balcony exposed to cold winds.

Key takeaways

Winter is a crucial time to preserve this precious aromatic plant. Sensitive to frost, it requires special attention from autumn onwards: overwintering indoors in a frost-free location for pots, generous mulching for plants in the ground, and pruning in late winter (February-March) to encourage vigorous spring growth. With these simple and regular steps, your lemon verbena will remain vigorous and bountiful for many years to come.

Your immediate action: before the first frost, bring your pot indoors to a bright, frost-free location, reduce watering, and schedule a date in February for pruning. That's all it takes to ensure your lemon verbena thrives during the winter.