Feverfew in Zone 6B — Mountain West

Feverfew is a fantastic addition to any Mountain West garden. Its cheerful daisy-like flowers bring a pop of color, its leaves have a unique, slightly bitter taste, and it's reputed to have various medicinal properties. Plus, the intense sun here really brings out the best in its blooms, and the cool nights even in summer enhance its flavor.

Our high altitude and short growing season (around 163 days) definitely present some challenges. But with careful timing, and understanding our unique climate, you can easily grow Feverfew. It's a hardy plant, and the timing works well for our region.

Starting Feverfew indoors in the Mountain West gives you a head start, especially considering our late springs. Begin indoors mid-February through early March, about eight weeks before you plan to transplant. This is most useful if you're aiming for a very early bloom.

Use seed trays or small pots filled with a good seed-starting mix. Keep them consistently moist, and bottom watering is a great way to do this without disturbing the tiny seeds. Place the trays in a warm spot, and under grow lights, ensuring they get plenty of light, as our spring weather can be unpredictable.

Transplant your Feverfew seedlings outdoors mid-April through mid-May, after the danger of hard frost has passed. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. Start with an hour or two of shade, increasing the time and sun exposure each day.

Choose a sunny spot with well-drained soil, and space the plants 12-15 inches apart to allow for their bushy growth. Keep an eye on the forecast for late frosts; even in mid-May, we can get a cold snap at this altitude, so be prepared to cover your plants if needed.

Direct sowing Feverfew is a simple and effective method in the Mountain West. Sow seeds late April through mid July, once the soil has warmed up a bit. This is a good choice if you don't want to deal with the hassle of indoor starting.

Prepare the soil by loosening it and removing any rocks or debris. Scatter the seeds thinly over the surface, then lightly press them into the soil. Keep the soil consistently moist until the seedlings emerge. Thin the seedlings to 12-15 inches apart as they grow.

Feverfew is relatively drought-tolerant, making it a great choice for our dry Mountain West climate. Once established, it doesn’t need a ton of water. In fact, overwatering is more of a concern than underwatering.

During the peak of summer, when temperatures reach around 85°F, water deeply about once a week, providing around 1 inch of water. Use the "finger test" – stick your finger about 2 inches into the soil. If it feels dry, it's time to water. In spring and fall, you'll likely need to water even less frequently.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases, though our low humidity makes this less of a concern than in other regions. Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot. A light layer of mulch around the base of the plants can help retain moisture and regulate soil temperature.

Pruning Feverfew is key to keeping it tidy and encouraging continuous blooms. Deadhead spent flowers regularly throughout the growing season to prevent the plant from putting its energy into seed production. This will encourage more flowers to form.

Simply snip off the flower heads just below the flower. After the main flush of blooms is over, usually in late summer, you can cut the plant back by about one-third to rejuvenate it. As the first frost approaches in early October, leave the last blooms on the plant if you want it to self-seed, or cut the plant back completely for a tidier garden.

You can expect your first Feverfew harvest early July through mid-October, about 70 days after planting. The best time to harvest is when the small, daisy-like flowers are in full bloom. This is when the plant's oils are at their peak concentration.

To harvest, simply snip off the stems with flowers using scissors or pruning shears. For continued production, harvest regularly to encourage new growth. As the first frost approaches in early October, you can harvest the remaining flowers and foliage to dry for later use.

Here are some common problems you might encounter with Feverfew in the Mountain West:

Self-seeds Prolifically *What it looks like:* Numerous tiny seedlings popping up everywhere in your garden. *What causes it:* Feverfew is a prolific self-seeder, and in our long sunny days, it thrives. *How to fix/prevent it:* Deadhead spent flowers before they go to seed. Use mulch to suppress seedling growth. 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. *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 on the leaves. *What causes it:* Tiny larvae burrowing inside the leaves. The intense UV radiation can weaken plant defenses, making them more susceptible. *How to fix/prevent it:* Remove and destroy affected leaves. Use row covers to prevent adult flies from laying eggs. Introduce beneficial nematodes to the soil.

Mountain West Specific Challenges: Our moderate-at-altitude heat and low humidity are generally beneficial for Feverfew. However, the intense UV radiation can stress the plants, making them more vulnerable to pests. Our dry conditions mean you need to be vigilant about watering, especially during the hottest part of the summer.

Feverfew makes a great companion plant for several garden favorites in the Mountain West. Plant it near tomatoes to help repel pests like whiteflies. Roses also benefit from Feverfew's pest-repelling properties, as it can deter aphids and other insects.

Herbs like rosemary and thyme are excellent companions, as they share similar growing requirements (full sun and well-drained soil) and can help attract beneficial insects. Avoid planting Feverfew near plants that are heavy feeders, as it prefers less fertile soil.