Feverfew in Zone 6B — Midwest

Feverfew is a fantastic addition to any Midwest garden. Its cheerful, daisy-like flowers bring a bright spot to the landscape, plus it's known for its medicinal properties. This plant is also great for attracting beneficial insects. The Midwest's fertile soil and decent summer heat really help feverfew thrive.

Our variable spring weather and occasional summer heat spells can be a bit of a challenge, but don't worry. Feverfew is a hardy plant and with our 183-day growing season, you'll have plenty of time to enjoy it. Proper timing is key, and we'll walk you through it.

Starting feverfew indoors gives you a head start, but it's not essential. If you're aiming for earlier blooms, or just want to get your hands dirty sooner, indoor starting is a good option.

Begin in early to late February, about 8 weeks before you plan to transplant outdoors. Use seed trays with a good seed-starting mix, provide warmth (a heat mat helps), and ensure plenty of light – a grow light is ideal. Remember to water from the bottom to prevent damping off, which can be an issue in our sometimes-humid Midwest springs.

Transplanting your feverfew seedlings outdoors is best done in early April through early May, after danger of hard frost has passed. However, keep an eye on the forecast, as we can still get some unexpected dips in temperature.

Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind. Plant them 12-15 inches apart in well-drained soil. If there's a late cold snap, cover them with a frost blanket to protect them.

Direct sowing feverfew is a simple and effective way to grow it, especially if you're not looking for super early blooms. Plus, it saves you the indoor space.

Sow seeds mid April through late July. Make sure the soil is relatively warm. Lightly rake the seeds into the soil surface and keep them consistently moist until they germinate. Thin seedlings to 12-15 inches apart once they're a few inches tall.

Feverfew is pretty low-maintenance when it comes to watering, which is great for busy Midwest gardeners. Once established, it's quite drought-tolerant, making it a worry-free addition to your garden.

During the spring, when rainfall is typically adequate, you may not need to water much at all unless we're experiencing a dry spell. In the summer, especially during any of those moderate-to-hot 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 1 inch of water per week, either from rainfall or irrigation.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our moderately humid climate. Yellowing leaves can indicate overwatering, while wilting suggests underwatering. A layer of mulch around your feverfew plants will help retain moisture and suppress weeds, which is always a plus.

Pruning feverfew is straightforward and helps keep it looking its best. Deadheading is key for encouraging continuous blooms throughout the season.

Simply pinch or snip off the spent flowers as they fade. This prevents the plant from putting energy into seed production and encourages it to produce more flowers. After the main flowering period, usually late in the summer, you can cut back the entire plant to tidy it up. Keep an eye on it because feverfew self-seeds aggressively if you let the flowers go to seed. As the first frost approaches around mid- October, you can leave the remaining foliage for winter interest or cut it back completely – it's up to you.

You can expect your first feverfew harvest in late June through late 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 cut the stems with flowers using sharp scissors or pruners. Harvest in the morning after the dew has dried for the best results. Regular harvesting encourages continued production throughout the season.

As the first frost approaches in mid- October, harvest any remaining flowers you want to use. You can dry them for later use. Even after a light frost, the plant may still produce a few more blooms if the weather stays mild.

Here are a few common problems you might encounter with feverfew in the Midwest:

Self-seeds Prolifically

• What it looks like: Numerous tiny seedlings popping up everywhere in your garden where you don't want them.
• What causes it: Letting the flowers go to seed. Feverfew is a generous self-seeder.
• How to fix/prevent it: Deadhead spent flowers regularly to prevent seed formation. If you want to save seeds, only allow a few flowers to mature. Remove unwanted 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. The warm days and moderate humidity in our Midwest summers can lead to rapid aphid infestations.
• 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 yellow trails inside the leaves.
• What causes it: Larvae of small flies or moths tunneling between the leaf surfaces.
• How to fix/prevent it: Remove and destroy affected leaves. Cover plants with lightweight row covers to prevent adult insects from laying eggs. Insecticidal soap can help control infestations.

Midwest Specific Challenges: Our moderate-to-hot summers and moderate-to-humid conditions can create an ideal environment for pests like aphids. The wet-summer rainfall can also increase the risk of fungal diseases if plants are not properly spaced and ventilated.

Feverfew makes a great companion plant in the Midwest garden. Plant it near tomatoes, and it can help deter certain pests that bother tomatoes, like whiteflies. Roses also benefit from having feverfew nearby, as it is thought to repel aphids.

Many herbs, like rosemary and thyme, make good companions for feverfew, as they share similar growing requirements and can attract beneficial insects. Avoid planting feverfew near members of the cabbage family, as it can attract leaf miners that may also target those crops.