Feverfew
Tanacetum parthenium

Feverfew

5a–9bHardiness zone
SpringSummerFall
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Peak bloom
Summer
In bloom
Fall
Not in bloom
Peak bloom
In bloom
Background

Feverfew is a short-lived perennial in the daisy family, grown as a herb and an ornamental. It carries clusters of small white daisies with yellow centres, 18 to 24 inches tall, over aromatic, finely cut, lime-green foliage, from early summer for months. The double and golden-leaved forms ('Aureum') are the ones most often sold. Its name records a long history in herbal medicine; in the garden it is valued for the long bloom and its habit of filling gaps.

It grows easily from seed and tolerates poor soil. Sow on the surface in spring, since the seed needs light, and thin or plant out 12 to 18 inches apart in full sun or part shade. Deadhead to extend bloom and to limit self-seeding, which can be aggressive; plants weaken after two or three years, so let a few volunteers stand or divide the clump in spring.

It is a useful cut flower, lasting a week or more, and the stems are sturdy. Bees and hoverflies work the flowers, and the strong-smelling foliage keeps deer and rabbits off. It is native to the Balkans and naturalised across much of North America. Hardy in zones 5 to 9.

Care guide
SunFull sun to part shade - 6+ hours preferred
Water1 inch per week; tolerates short dry spells once established
SoilWell-draining, average fertility; pH 6.0–7.5
Spacing12–18 inches
Height18–24 inches
Zone5a – 9b
Direct sowFrost hardy
Seasonal tasks
spring
watchCheck new growth for aphids on stem tips and undersides of leaves.
sowSurface-sow seeds indoors and press into the soil without covering; keep moist and warm.
sowDirect sow or transplant seedlings outdoors after last frost.
summer
cutDeadhead spent flowers to prolong bloom and control self-seeding.
cutHarvest flowering stems for drying when blooms are fully open.
watchInspect for powdery mildew during humid spells; thin crowded plants for airflow.
cutCut back plants after flowering to encourage a second flush and tidy growth.
fall
watchMark or thin self-sown seedlings to manage spread for next year.
Common problems

Powdery mildew

Symptoms

White or grey powdery coating on leaves - usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.

Aster Yellows

Symptoms

Deformed, greenish flowers, stunted growth, and yellowed foliage. Flower centers may produce tufts of leafy growth instead of normal petals.

Treatment

No cure. Remove and destroy infected plants immediately to stop spread. Control leafhoppers, which transmit the disease, and remove nearby weed hosts.

Pests

Aphids

Aphididae →
Symptoms

Clusters of small soft insects on new growth and flower buds.

Treatment

Knock off with a strong jet of water. Ladybirds and lacewings are natural predators. Insecticidal soap as last resort.