Feverfew in Zone 6B — Great Plains

Feverfew is a charming and useful addition to any Great Plains garden. Its cheerful, daisy-like flowers brighten up borders, and its reputation as a traditional herbal remedy makes it a satisfying plant to grow. Plus, it attracts beneficial insects, which is a bonus for any gardener dealing with the challenges of our variable climate.

Our region's extreme temperature swings and occasional hail can be tough on plants, but Feverfew is relatively hardy and adaptable. With a 198-day growing season, you have plenty of time to get it established and enjoy its blooms. Proper timing and a bit of planning will set you up for success.

Starting Feverfew indoors is an option, especially if you want a head start on the season, but it's not essential in our Zone 6B climate. If you choose to start indoors, aim for late January through mid February, about eight weeks before you plan to transplant outdoors.

Use seed trays with a good seed-starting mix, and provide warmth (a heat mat can help) and plenty of light – a grow light is ideal. Bottom watering is a great way to keep the seedlings evenly moist without risking fungal diseases. Remember that our spring weather is variable, so be prepared to protect your seedlings if we get a late cold snap.

Transplant your Feverfew seedlings outdoors in early April through early May, after the risk of hard frost has passed. Before transplanting, harden off the seedlings by gradually exposing them to outdoor conditions for about a week.

Choose a sunny spot with well-drained soil, and space the plants 12-15 inches apart. Keep an eye on the weather forecast – if there's a risk of a late frost or hail, be ready to cover your young plants for protection.

Direct sowing Feverfew is a perfectly viable option in the Great Plains. Sow seeds directly into the garden in early April through early August. This gives you a wide window to work with, even if spring gets off to a slow start.

Prepare the soil by loosening it and removing any weeds. Gently press the seeds into the soil – they need light to germinate. Keep the soil consistently moist until the seedlings emerge. Thin the seedlings to 12-15 inches apart once they are a few inches tall.

Feverfew is a relatively drought-tolerant plant, which is a definite advantage in our Great Plains climate, where rainfall can be unpredictable. Once established, it needs minimal watering. However, it’s crucial to provide adequate moisture, especially during the hottest parts of the summer.

During the spring and fall, when temperatures are milder and rainfall is more frequent, you may only need to water once a week, if at all. In the heat of summer, when temperatures can soar into the 90s, check the soil moisture more frequently. Use the finger test: stick your finger into the soil about two inches deep. 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 to avoid wetting the foliage, which can encourage fungal diseases, even in our low-to-moderate humidity. Overwatering can be just as detrimental as underwatering. Signs of overwatering include yellowing leaves and wilting, even when the soil is moist. Underwatering, on the other hand, will cause the leaves to become dry and brittle. Applying a layer of mulch around the plants will help retain moisture and suppress weeds.

Deadheading is key to keeping your Feverfew blooming throughout the growing season. Simply pinch or cut off the spent flower heads as they fade. This encourages the plant to produce more flowers instead of putting energy into seed production.

After the main flush of flowering is over, usually in late summer or early fall, you can cut the plant back by about half to encourage a second flush of blooms. As the first frost approaches in late October, you can leave the remaining foliage in place to provide winter interest, or cut it back to the ground. Be aware that Feverfew self-seeds aggressively, so remove spent flowers if you want to control its spread.

You can expect your first Feverfew harvest starting in mid-June and continuing through early November. Look for the small, daisy-like flowers, which are the part of the plant traditionally used for herbal remedies. The flowers are ready to harvest when they are fully open and the petals are firm.

To harvest, simply cut the stems just below the flower heads. Harvest in the morning, after the dew has dried, for the best flavor and potency. Regular harvesting encourages continued production.

As the first frost approaches in late October, harvest any remaining flowers before they are damaged. You can dry the flowers for later use. Hang them upside down in a cool, dark, well-ventilated place until they are completely dry.

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

Self-seeds prolifically

• What it looks like: Numerous Feverfew seedlings popping up everywhere in your garden.
• What causes it: Allowing the flowers to go to seed. The seeds are easily dispersed by wind, which is common in our region.
• How to fix/prevent it: Deadhead spent flowers regularly to prevent seed formation. If you want to save seeds, collect them carefully and store them in a sealed container.

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. Warm, dry conditions can favor aphid outbreaks.
• 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: Notice winding trails or blotches within the leaves.
• What causes it: Larvae of small flies or moths burrowing between leaf surfaces. More prevalent during warmer months.
• How to fix/prevent it: Remove and destroy affected leaves. Use row covers to prevent adult insects from laying eggs. Insecticidal soap or neem oil can help control infestations.

Great Plains Specific Challenges: Our hot summers, low-to-moderate humidity, and variable rainfall can stress Feverfew, making it more susceptible to pests and diseases. Consistent watering during dry spells and good air circulation can help prevent problems. Also, be prepared to protect your plants from hail, which can cause significant damage.

Feverfew makes a great companion plant for several reasons. Plant it near tomatoes to deter pests like tomato hornworms. Roses also benefit from Feverfew's presence, as it can help repel aphids.

Many herbs, like rosemary and sage, thrive alongside Feverfew, as they share similar growing requirements and can create a beneficial microclimate. Avoid planting Feverfew near plants that prefer very moist soil, as its drought tolerance means it prefers drier conditions.