Feverfew in Zone 7A — Northeast

Feverfew is a charming addition to any Northeast garden. Its cheerful, daisy-like flowers bring a touch of the wild to your borders, and its leaves have a slightly bitter, medicinal scent. The cool nights we often get here in late summer seem to intensify the fragrance, making it even more enjoyable.

Our short growing season and the occasional late spring frost can be a challenge, but Feverfew is surprisingly hardy. With a little planning, you can easily fit it into your 198-day growing season and enjoy its benefits.

Starting Feverfew indoors gives you a head start on our relatively short growing season. If you're itching to get your hands dirty in late January through mid February, about 8 weeks before transplanting, this is the way to go. It's especially useful if you want to ensure an early bloom.

Use seed trays filled with a good seed-starting mix. Keep them consistently moist by watering from the bottom – this prevents damping off. Provide warmth and plenty of light, either from a sunny windowsill or a grow light. Remember, our springs are late, so any indoor starts help make the most of the season.

Once the danger of frost has passed, usually in early April through early May, it's time to transplant your Feverfew seedlings outdoors. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

Choose a sunny spot with well-drained soil and space the plants 12-15 inches apart. Our weather can be unpredictable in early spring, so keep an eye out for any late frosts and be ready to cover the plants if necessary.

Direct sowing Feverfew is a simple and straightforward method that works well in the Northeast. You can sow seeds directly into the garden from early April through early August. This gives you a wide window to work with.

Prepare the soil by loosening it and removing any rocks (we have plenty of those in our rocky New England soil!). Sprinkle the seeds lightly over the surface and gently press them in. Keep the soil consistently moist until the seedlings emerge. Thin the seedlings to 12-15 inches apart as they grow. Just be aware that direct sowing might delay flowering compared to starting indoors.

Feverfew is a pretty low-maintenance plant, especially when it comes to water. Once established, it's quite drought-tolerant, which is helpful during those occasional dry spells we get in the summer. However, well-drained soil is essential, as it doesn't like sitting in soggy conditions.

In the spring, when the plants are young and actively growing, water them regularly, about an inch of water per week, especially if we're not getting consistent rainfall. During the summer, you can usually ease up on the watering, relying on our even rainfall and moderate-to-humid conditions to keep them happy. Use the "finger test" – stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our moderate-to-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 plants helps retain moisture and suppress weeds, making your life even easier.

Deadheading is key to keeping your Feverfew plants blooming throughout the summer. Simply pinch or cut off the spent flower heads just below the flower. This encourages the plant to produce more flowers rather than putting energy into seed production.

You can deadhead throughout the growing season, from mid-June through early November, as the flowers fade. After the main flowering period, usually in late summer or early fall, you can cut the plants back by about half to tidy them up. Since Feverfew self-seeds readily, removing the spent flower heads is also a good way to prevent it from spreading too aggressively. As the first frost approaches in late October, you can leave the remaining foliage in place to provide some winter interest, or cut it back to the ground.

You can expect your first Feverfew harvest around mid June, about 70 days after sowing or transplanting. The plants will continue to produce flowers throughout the summer and into early November, giving you a long harvest window. The best time to harvest is when the small, daisy-like flowers are in full bloom.

To harvest, simply snip off the flowering stems with a pair of scissors or pruning shears. You can use the fresh or dried leaves and flowers for various purposes. Regular harvesting encourages continued production, so don't be afraid to cut them back. As the first frost approaches in late October, you can harvest any remaining flowers and foliage to dry for later use.

Here are a few common problems you might encounter with Feverfew in the Northeast:

Self-seeds prolifically

• What it looks like: Numerous small seedlings popping up everywhere in your garden and even in unwanted areas like lawns and pathways.
• What causes it: Feverfew is a prolific self-seeder, and our moderate-to-humid climate provides ideal conditions for seed germination.
• How to fix/prevent it: Deadhead spent flowers regularly to prevent seed formation. Mulch around the plants to suppress weed growth and make it easier to pull out any unwanted seedlings.

Aphids

• What it looks like: Clusters of tiny soft-bodied insects (green, black, or white) on stems and leaf undersides. Sticky honeydew residue. Curled or distorted new growth.
• What causes it: Rapid-reproducing sap-sucking insects. Populations explode in warm weather. Ant colonies may farm them for honeydew.
• How to fix/prevent it: Strong water spray knocks them off. Encourage ladybugs and lacewings (natural predators). Insecticidal soap for heavy infestations. Neem oil works systemically. Avoid excess nitrogen fertilizer (it attracts them).

Leaf Miners

• What it looks like: Winding, white or brown trails within the leaves. The leaves may also appear blotchy or distorted.
• What causes it: Tiny larvae burrowing between the upper and lower surfaces of the leaves.
• How to fix/prevent it: Remove and destroy affected leaves. Cover plants with row covers to prevent adult flies from laying eggs. Insecticidal soap or neem oil can also be effective.

Northeast Specific Challenges: Our moderate heat and moderate-to-humid humidity can create favorable conditions for aphids and leaf miners, so regular monitoring is essential. The even rainfall can also contribute to the spread of fungal diseases if the plants are not properly spaced or if the soil is not well-drained.

Feverfew makes a great companion plant for several other garden favorites. Planting it near tomatoes can help deter pests, as its strong scent repels some insects that commonly attack tomatoes. Roses also benefit from having Feverfew nearby, as it can help to attract beneficial insects that prey on aphids and other rose pests.

Many herbs, such as rosemary and sage, also make good companions for Feverfew. The herbs’ strong scents can help to confuse pests, while the Feverfew attracts beneficial insects that help to keep the herb garden healthy. Avoid planting Feverfew near anything that is very sensitive to aphids.