Feverfew in Zone 9B — Southern California

Feverfew is a fantastic addition to any Southern California garden. Its cheerful, daisy-like blooms bring a bright pop of color, and the plant itself is known for its medicinal properties. Plus, it attracts beneficial insects that will help keep your garden healthy and thriving.

While we face challenges like drought and intense summer heat inland, Feverfew's drought tolerance and resilience make it a manageable and rewarding plant to grow here. Our long growing season, stretching nearly year-round, gives you plenty of opportunity to enjoy its beauty and benefits. You can get a year-round harvest with our 334-day growing season.

Starting Feverfew indoors isn't essential in our mild climate, but it can give you a head start. If you want to get a jump on the season, aim to sow seeds indoors from mid November through early December, about eight weeks before you'd like to transplant them outside.

Use seed trays with a good seed-starting mix, keep them consistently moist (bottom watering is great for this), and provide a warm location with plenty of light. Because our springs come early, starting indoors means you can have blooms even sooner!

Transplanting Feverfew outdoors is best done from mid January through mid February. Before moving your seedlings outside, be sure to harden them off. Give them about a week of gradual exposure to the outdoors, increasing the time each day.

Plant them 12-15 inches apart in a sunny or partially shaded spot. Keep an eye on the forecast for any late cold snaps that sometimes come through in January, and protect your young plants if needed.

Direct sowing Feverfew is a simple and effective method in our climate. You can sow seeds directly into your garden bed from late January through early October.

Prepare the soil by loosening it and removing any weeds or rocks. Gently press the seeds into the soil, keeping them about 12-15 inches apart. Keep the soil consistently moist until the seedlings emerge.

Feverfew is wonderfully drought-tolerant, making it a perfect choice for our water-wise gardens in Southern California. Once established, it needs very little supplemental watering.

During our winter-wet season, natural rainfall is often sufficient. In the spring and fall, water deeply but infrequently, allowing the soil to dry out between waterings. During the summer heat inland, you might need to water once a week, especially if your Feverfew is in full sun. Use the finger test: if the top two inches of soil feel dry, it's time to water.

Aim for about an inch of water per week during the hotter months. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our low-to-moderate humidity. Signs of underwatering include wilting leaves, while overwatering can lead to yellowing leaves and root rot. Adding a layer of mulch around your Feverfew can help retain moisture in the soil and reduce the need for frequent watering.

Pruning Feverfew is simple and helps keep it looking its best. The most important thing is to deadhead spent flowers regularly. This encourages continuous blooming throughout the growing season.

Simply snip off the faded flower heads just below the bloom. After the main flowering period, usually around late fall, you can cut the plant back to encourage fresh growth. Be aware that Feverfew self-seeds aggressively, so remove spent flowers before they go to seed if you want to control its spread.

You can expect your first Feverfew harvest around early April, and continue harvesting through early January. The best time to harvest is when the small, daisy-like flowers are in full bloom. These blooms are used for traditional herbal remedies.

To harvest, simply snip off the flower heads with clean scissors or garden shears. Regular harvesting encourages the plant to produce more flowers. As the first frost approaches in late December, you can harvest any remaining flowers and dry them for later use. This way, you can enjoy the benefits of Feverfew even during the cooler months.

Here are some common problems you might encounter with Feverfew in Southern California:

Self-Seeds Prolifically

• What it looks like: Seedlings popping up everywhere in your garden where you didn't plant them.
• What causes it: Feverfew is a vigorous self-seeder, and the seeds can spread easily in our mild climate.
• How to fix/prevent it: Deadhead spent flowers before they go to seed. Use mulch to suppress seed germination. Pull out unwanted seedlings as soon as you see 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: Winding, whitish or yellowish trails within the leaves.
• What causes it: Larvae of certain flies or moths tunnel between the leaf surfaces, feeding on the tissue.
• How to fix/prevent it: Remove and destroy affected leaves. Use row covers to prevent adult insects from laying eggs on the plants. Insecticidal soap or neem oil can help control infestations.

Southern California Specific Challenges: Our hot summer heat inland can stress Feverfew, making it more susceptible to pests. Be sure to provide adequate water during heat waves, but avoid overwatering, which can lead to root rot. The low-to-moderate humidity helps prevent fungal diseases, but keep an eye out for aphids and leaf miners, especially during the warmer months.

Feverfew makes a great companion plant for several vegetables and herbs in your Southern California garden.

• Tomatoes: Feverfew can help repel certain pests that attack tomatoes, such as whiteflies and aphids.
• Roses: Plant Feverfew near roses to deter aphids and other rose pests.
• Herbs: Many herbs, like rosemary and thyme, benefit from Feverfew's pest-repelling properties.

Avoid planting Feverfew near plants that are heavy feeders, as it can compete for nutrients. Overall, Feverfew is a beneficial addition to any Southern California garden, helping to create a healthy and thriving ecosystem.