Feverfew in Zone 7B — Desert Southwest

Feverfew is a worthwhile addition to any Desert Southwest garden. Its cheerful daisy-like flowers bring a bright pop of color, and it's known for its medicinal properties, offering a natural remedy for headaches and other ailments. Plus, it attracts beneficial insects, which is always a win in our gardens.

Desert gardening has its challenges, like extreme heat and alkaline soil, but Feverfew is surprisingly adaptable. Our long growing season, stretching from early spring well into fall, gives you plenty of time to get it established and enjoy its benefits. With a little planning, Feverfew can thrive here.

Starting Feverfew indoors makes sense if you want a head start, especially given our very-early spring. Begin in early to late January, about eight weeks before you plan to transplant outdoors. This gives the seedlings a strong foundation before facing our intense sun.

Use seed trays with a good seed-starting mix. Keep the soil consistently moist by bottom watering—set the tray in a shallow dish of water and let it soak up from the bottom. Maintain a warm environment and provide supplemental light until they're ready to harden off.

Transplant your Feverfew seedlings outdoors in early March through early April. This timeframe allows them to establish before the extreme heat kicks in. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week.

Choose a spot with full sun to partial shade and space the plants 12-15 inches apart. Keep an eye on the weather forecast for any late-season temperature swings, and protect your young plants if needed.

Direct sowing is a straightforward option for Feverfew in our region. Sow seeds mid-March through late August, when the soil has warmed up a bit. Prepare the soil by loosening it and removing any rocks or debris.

Scatter the seeds thinly over the surface and gently press them into the soil. Keep the soil consistently moist until the seedlings emerge. Thin them to 12-15 inches apart once they have a few sets of true leaves.

Feverfew is relatively drought-tolerant once established, making it a good fit for our arid climate. However, consistent watering is crucial, especially during the first few weeks after planting and during our hottest months. Feel the soil about two inches deep—if it's dry, it's time to water.

During the active growing season, give your Feverfew 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 lead to fungal issues even in our dry air. During the monsoon season, be mindful of overwatering, as our alkaline soil doesn't drain as well.

Signs of underwatering include wilting and yellowing leaves. Overwatering can lead to root rot, indicated by soggy soil and stunted growth. Mulching around the base of the plants with organic matter helps retain moisture and regulate soil temperature.

Deadheading is key to keeping your Feverfew blooming throughout the season. Snip off spent flowers just below the flower head to encourage new growth.

After the main flowering period, usually late summer, cut the plant back by about one-third to rejuvenate it. Be aware that Feverfew self-seeds easily, so if you want to control its spread, remove the flower heads before they go to seed. As first frost approaches around mid- November, you can leave the plant standing or cut it back to the ground.

You can expect your first harvest of Feverfew flowers starting in late May and continuing through late November. The plant is typically ready about 70 days after planting. The best time to harvest is when the small, daisy-like flowers are fully open and vibrant.

To harvest, simply snip off the flower heads with a pair of clean scissors or pruning shears. Harvest regularly to encourage continued blooming. Even as first frost approaches in mid- November, you can still harvest any remaining flowers.

Here are some common issues you might encounter with Feverfew in the Desert Southwest:

Self-seeds Prolifically

• What it looks like: Seedlings popping up everywhere in your garden, even in areas where you didn't plant Feverfew.
• What causes it: Feverfew produces a lot of seeds, and they spread easily. Our monsoon moisture can help them germinate quickly.
• How to fix/prevent it: Deadhead spent flowers before they go to seed. Consider growing Feverfew in containers to limit its spread.

Aphids

• What it looks like: Clusters of tiny insects 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: Tan, winding trails or blotches inside the leaves.
• What causes it: Larvae of small flies tunnel between the upper and lower leaf surfaces, feeding on 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.

Desert Southwest Specific Challenges: Our extreme heat can stress Feverfew, making it more susceptible to pests and diseases. Arid humidity might seem like a blessing when it comes to fungal diseases, but the rapid swings in moisture during monsoon season can create favorable conditions.

Feverfew benefits from companion planting in our Desert Southwest gardens. Plant it near tomatoes to help deter pests. Roses also benefit from Feverfew's pest-repelling properties.

Many herbs, such as rosemary and thyme, make good companions for Feverfew, as they share similar growing requirements and attract beneficial insects. Avoid planting Feverfew near members of the cabbage family, as they can compete for nutrients.