Lemon Balm in Zone 7A — Mid-Atlantic

Lemon Balm is a fantastic addition to any Mid-Atlantic garden. The lemony scent and flavor are wonderful in teas, salads, and even as a mosquito repellent! Plus, it's incredibly satisfying to grow something so useful right in your backyard, especially with our four distinct seasons and reliable rainfall making it suitable for most crops.

Our humid summers and variable spring weather can present some challenges, but with a little planning, you can easily enjoy a bountiful harvest of Lemon Balm. Our 208-day growing season gives you plenty of time to get it established and thriving.

Starting Lemon Balm indoors is an option, but honestly, it's often easier to direct sow here in the Mid-Atlantic. However, if you're itching to get a head start, aim to sow your seeds indoors from mid-February through early March, about six weeks before you plan to transplant.

Use seed trays with a good seed-starting mix, providing warmth and plenty of light (a grow light works wonders). Remember to water from the bottom to encourage strong root growth and prevent damping-off. With our moderate spring character, you'll need that head start to beat the heat.

Once the danger of frost has passed—typically early April through early May here—you can transplant your Lemon Balm seedlings outdoors. Before transplanting, be sure to harden them off by gradually exposing them to outdoor conditions for about a week.

Plant them 18-24 inches apart in a sunny spot, but keep in mind our springs can be unpredictable. If a late frost is predicted, be ready to cover your young plants.

Direct sowing Lemon Balm is a simple and effective method, especially in our climate. You can sow seeds directly into your garden beds from early April through early August.

Make sure the soil is well-drained and has warmed up a bit. Scatter the seeds lightly and cover them with a thin layer of soil. Space plants to 18-24 inches apart as they grow. Direct sowing avoids the fuss of indoor starting, but you'll need to keep the soil consistently moist until the seedlings emerge.

Lemon Balm enjoys moderate watering, which is something to keep in mind with our humid summers. During the hotter months, check the soil regularly using the "finger test"—stick your finger about two inches deep. If it feels dry, it's time to water.

Generally, aim for about an inch of water per week, either from rainfall or irrigation. Water at the base of the plant to avoid wetting the leaves, which can encourage fungal diseases in our humid climate.

Signs of underwatering include wilting leaves, while overwatering can lead to yellowing leaves and root rot. A layer of mulch around the base of the plant can help retain moisture and suppress weeds, which is especially helpful with our even rainfall.

Lemon Balm is fairly low-maintenance when it comes to pruning. Throughout the growing season, feel free to harvest leaves as needed for your culinary or medicinal uses.

In midsummer, you might want to cut the plant back by about half to prevent it from getting too leggy. Be sure to remove any flower stalks as soon as you see them, as Lemon Balm can self-seed aggressively if left unchecked. As our first frost approaches around late October, you can give the plant a final trim before winter sets in.

You can expect your first harvest of Lemon Balm around mid-June, about 70 days after sowing. Look for healthy, green leaves that are at least a few inches long. The best flavor is usually before the plant starts to flower.

To harvest, simply snip off the leaves with scissors or pinch them off with your fingers. Be careful not to damage the main stem. Regular harvesting encourages continued production, so don't be shy about using your Lemon Balm! As late October approaches, harvest as much as you can before the first frost hits.

Here are some common problems you might encounter with Lemon Balm in the Mid-Atlantic:

Aggressive Spreading

• What it looks like: Lemon Balm popping up in unwanted areas of your garden, spreading beyond its intended space.
• What causes it: This plant is a vigorous grower and self-seeds readily.
• How to fix/prevent it: Remove flower stalks before they go to seed. Plant in a container or use barriers to contain the roots. Regularly pull up unwanted seedlings.

Bolting

• What it looks like: The plant sends up a flower stalk prematurely, and the leaves become bitter or tough.
• What causes it: Bolting can be triggered by heat, long days, or drought stress.
• How to fix/prevent it: Provide shade during the hottest part of the day. Keep the soil consistently moist. Regularly harvest leaves to encourage vegetative growth.

Powdery Mildew

• What it looks like: A white or grayish powdery coating on the leaves, stems, and sometimes fruit.
• What causes it: This fungal disease thrives in warm days, cool nights, and moderate humidity.
• How to fix/prevent it: Improve air circulation by spacing plants properly and pruning. Remove affected leaves. Apply neem oil or potassium bicarbonate sprays. A milk spray (1 part milk to 9 parts water) is also effective.

Mid-Atlantic Specific Challenges: Our moderate-to-hot heat, humid humidity, and even rainfall can create ideal conditions for powdery mildew and bolting. Monitor your plants closely and take preventative measures.

Lemon Balm makes a great companion plant for several vegetables in your Mid-Atlantic garden. Tomatoes benefit from Lemon Balm's pest-repelling properties, helping to keep away tomato hornworms. Squash also enjoys the protection from squash bugs that Lemon Balm offers. Broccoli and cauliflower benefit too, as Lemon Balm can deter cabbage moths. Avoid planting near any herbs in the mint family, which compete for resources.