Feverfew in Zone 5A — Midwest

Feverfew is a delightful addition to any Midwest garden. Its cheerful, daisy-like flowers bring a touch of whimsy, and the plant itself is known for its medicinal properties. Plus, it attracts beneficial insects, making it a valuable companion plant in our fertile soil.

While our Midwest weather can be unpredictable, with variable springs and the occasional summer heat spell, Feverfew is surprisingly resilient. With a little attention to timing within our 157-day growing season, you can easily enjoy its benefits.

Starting Feverfew indoors gives you a head start, especially with our moderate-to-late springs. Begin sowing seeds mid-February through mid-March, about eight weeks before you plan to transplant. This is most useful if you want to establish a larger plant sooner.

Use seed trays with a good seed-starting mix. Keep the soil consistently moist by bottom watering and provide warmth and light. A heat mat and grow lights can be helpful, especially since we're often still dealing with cold snaps during that time of year.

Transplant your Feverfew seedlings outdoors late April through late May, once the danger of hard frost has passed. But, be sure to watch for late frost! Before planting, harden them off by gradually exposing them to outdoor conditions for about a week.

Choose a spot with full sun to part shade and space the plants 12-15 inches apart. Our springs can be quite wet, so ensure the soil drains well to prevent root rot.

Direct sowing Feverfew is a straightforward option, especially if you're not in a rush. Sow seeds early May through mid-July, after the soil has warmed up. Just be aware that the seedlings will take longer to mature compared to transplants.

Prepare the soil by loosening it and removing any weeds. Sprinkle the seeds lightly on the surface and gently press them into the soil. Keep the soil consistently moist until germination. Thin seedlings to 12-15 inches apart once they're established.

Feverfew is quite drought-tolerant once established, making it a low-maintenance choice for busy Midwest gardeners. However, during the initial establishment phase, consistent watering is key. Aim to keep the soil consistently moist, but not waterlogged.

During our wet summers, you might only need to water once a week, or even less. Use the "finger test" – stick your finger about two inches deep into the soil. If it feels dry, it's time to water. Generally, about an inch of water per week is sufficient. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid climate.

Signs of underwatering include wilting leaves and stunted growth. Overwatering, on the other hand, can lead to yellowing leaves and root rot. Adding a layer of mulch, such as shredded bark or compost, can help retain moisture and suppress weeds, which is especially helpful during summer heat spells.

Pruning Feverfew is simple and keeps the plant looking tidy. Deadhead spent flowers regularly throughout the growing season to encourage continuous blooming. This means snipping off the faded flower heads just below the bloom.

After the main flowering period, usually in late summer, you can cut the plant back by about one-third to rejuvenate it. As the first frost approaches around early October, you can leave the last blooms on the plant if you want it to self-seed for the following year. Just be aware that Feverfew can be quite prolific!

You can expect your first Feverfew harvest early July through mid-October, about 70 days after planting. The best time to harvest is when the small, daisy-like flowers are in full bloom.

To harvest, simply snip off the flower heads and leaves with clean scissors or pruning shears. Harvest in the morning after the dew has dried for the best flavor and potency. Feverfew doesn't ripen off the vine, so harvest when it's ready.

Regular harvesting encourages continued production throughout the summer. As the first frost approaches, harvest any remaining flower heads and leaves to dry for later use.

Here are some common issues you might encounter growing Feverfew in the Midwest:

Self-seeds Prolifically

• What it looks like: Numerous small seedlings popping up everywhere in your garden.
• What causes it: Feverfew readily drops its seeds, and they germinate easily in our fertile soil.
• How to fix/prevent it: Deadhead spent flowers before they go to seed. If you want to prevent self-seeding altogether, cut back the entire plant after flowering.

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: Squiggly, pale trails or blotches on leaves.
• What causes it: Larvae of small flies tunnel between the upper and lower leaf surfaces.
• 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.

Midwest Specific Challenges: Our moderate-to-hot summers and moderate-to-humid conditions can create a favorable environment for pests and diseases. Be vigilant in monitoring your Feverfew, especially during periods of high humidity and rainfall. Good air circulation and well-drained soil are crucial for preventing problems.

Feverfew makes a great companion plant for several garden vegetables and flowers.

• Tomatoes: Feverfew repels certain pests that can bother tomatoes, and it attracts beneficial insects that help pollinate tomato flowers.
• Roses: Feverfew deters aphids, a common problem for roses, and enhances their overall health.
• Herbs: Many herbs benefit from Feverfew's pest-repelling properties, and the combination creates a diverse and healthy garden ecosystem.

Avoid planting Feverfew near plants that are highly susceptible to aphids, as it can sometimes attract these pests.