Feverfew in Zone 4A — Midwest

Feverfew is worth growing in your Midwest garden for its cheerful daisy-like flowers that brighten up any space. It's a low-maintenance perennial that adds a touch of cottage charm, and its leaves have a slightly bitter, medicinal scent. Plus, it attracts beneficial insects to your garden, which is always a win.

Here in the Midwest, our variable spring weather and occasional summer heat spells can be challenging, but Feverfew is hardy enough to handle it. With our 128-day growing season, you have plenty of time to get a good harvest of flowers and leaves. Just watch for late frost and plan accordingly!

Starting Feverfew indoors in the Midwest is an option, especially if you want a head start on the season. Start your seeds indoors in early to late March, about eight weeks before you plan to transplant them outdoors. Use seed trays with a good seed-starting mix, and keep them in a warm spot with plenty of light – a sunny windowsill or under grow lights works well.

Bottom watering is a great way to keep the soil consistently moist without damping off the seedlings. Given our moderate-to-late springs, starting indoors gives you more control over the early stages of growth.

Transplanting Feverfew seedlings outdoors in the Midwest is best done in early May through early June, after the risk of hard frost has passed. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sunlight and temperature changes.

When transplanting, space the plants 12-15 inches apart in well-drained soil. Keep an eye on the weather forecast; we can still get some unexpected cold snaps in early May, so be prepared to cover your young plants if needed.

Direct sowing Feverfew seeds is a simple and effective method, especially if you're not in a rush. Sow the seeds in mid-May through late June, once the soil has warmed up. Feverfew seeds need light to germinate, so gently press them into the soil surface instead of burying them deeply.

Keep the soil consistently moist until the seedlings emerge. While direct sowing is easy, keep in mind that the plants might take a bit longer to mature compared to transplants.

Feverfew is pretty low-maintenance when it comes to watering, which is great for us Midwest gardeners who have busy lives. Once established, it's quite drought-tolerant. During our wet-summer season, you might not even need to water it much at all!

However, during our moderate-to-hot summer heat spells, check the soil moisture regularly. Stick your finger about 2 inches deep into the soil – if it feels dry, it's time to water. Aim for about an inch of water per week, either from rainfall or irrigation.

Water at the base of the plant rather than overhead to avoid fungal diseases, which can be a problem in our moderate-to-humid climate. Yellowing leaves can be a sign of overwatering, while wilting leaves indicate underwatering. Mulching around the base of the plants helps retain moisture and keeps the soil cool, which is helpful during our hotter periods.

Pruning Feverfew is straightforward. Deadhead the spent flowers regularly throughout the growing season to encourage continuous blooming. Simply snip off the flower heads just below the bloom.

After the main flowering period, usually around late summer, cut the plants back to about half their size. This helps keep them tidy and encourages new growth. Be aware that Feverfew self-seeds aggressively if you let the flowers go to seed. So, if you want to prevent it from spreading, make sure to deadhead regularly. As our first frost approaches around mid-September, leave the last blooms on the plants to provide seeds for the birds or let them self-sow if you don't mind them spreading.

You can expect your first Feverfew harvest in late July through late September here in the Midwest, about 70 days after planting. The best time to harvest is when the small, daisy-like flowers are in full bloom. The leaves are also used, so you can harvest those as needed.

To harvest, simply cut the stems with flowers or pluck the individual leaves. Be gentle to avoid damaging the plant. Feverfew will continue to produce flowers throughout the summer if you keep deadheading.

As the first frost approaches in mid-September, you can harvest the remaining flowers and leaves to dry for later use. Hang them upside down in a cool, dark, and dry place until they are completely dry.

Here are some common problems you might encounter with Feverfew in your Midwest garden:

Self-seeds prolifically

• What it looks like: Numerous Feverfew seedlings popping up everywhere in your garden, even in unwanted areas.
• What causes it: Allowing the flowers to go to seed. Our moderate-to-humid summers provide ideal conditions for seed dispersal and germination.
• How to fix/prevent it: Deadhead regularly to prevent seed formation. If you want to control its spread, remove seedlings as soon as you spot them.

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 tunnels or blotches within the leaves.
• What causes it: Larvae of small flies that tunnel through the leaf tissue.
• How to fix/prevent it: Remove and destroy affected leaves. Use row covers to prevent adult flies from laying eggs on the plants. Neem oil can also help control leaf miner infestations.

Midwest Specific Challenges: The moderate-to-hot heat and moderate-to-humid humidity of our Midwest summers can encourage aphid and leaf miner infestations. Our wet-summer rainfall can also increase the risk of fungal diseases if the plants are not in well-drained soil.

Feverfew makes a great companion plant for several other plants in your Midwest garden. Tomatoes benefit from Feverfew because it repels some common tomato pests, such as aphids and whiteflies. Roses also benefit from Feverfew, as it helps deter pests like aphids and Japanese beetles.

Herbs like rosemary and thyme are good companions because they have similar growing requirements and can help repel pests. Avoid planting Feverfew near plants that are susceptible to heavy aphid infestations, as it can attract them.