How to Grow Achillea 'Flowers of Sulfur'
Achillea 'Flowers of Sulfur'
Achillea millefolium 'Flowers of Sulfur'
flowerAchillea 'Flowers of Sulfur' is a striking cultivar of common yarrow featuring bright yellow, flat-topped flower clusters (umbels) that bloom throughout summer. This hardy perennial is prized for its vibrant color, feathery foliage, and exceptional drought tolerance once established. It attracts pollinators and beneficial insects while requiring minimal maintenance.
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Example Achillea 'Flowers of Sulfur' timeline · Pittsburgh, PA (Zone 6b)
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Plant Achillea 'Flowers of Sulfur'
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Achillea 'Flowers of Sulfur' blooms
Around Jun 16≈ 60 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in USDA zones 3-9; most vigorous in zones 4-8
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Seedling
2-3 weeksTiny cotyledons emerge; fine, thread-like first true leaves appear within 7-10 days
Keep soil moist but not waterlogged. Provide bright light. Do not cover seeds; they need light to germinate.
Vegetative Growth
3-4 weeksPlant develops feathery, finely dissected foliage in a low basal rosette; multiple stems emerge
Gradually reduce watering. Thin seedlings to proper spacing. Do not fertilize heavily. Transplant to garden when 3-4 true leaves appear.
Budding
2-3 weeksStems elongate and yellow flower buds form at stem tips; foliage reaches mature height (18-24 inches)
Support with stakes if in windy locations. Stop fertilizing. Ensure good drainage to prevent stem rot.
Flowering
6-10 weeksBright yellow flat-topped flower clusters (umbels) open; flowers last 6-8 weeks with continuous bloom
Deadhead spent flowers to extend blooming and encourage bushiness. Water sparingly. Watch for powdery mildew in humid conditions.
Seed Development & Dormancy
4-6 weeks into dormancyFlower clusters fade to tan/brown; seeds mature inside papery flower heads; plant growth slows in late summer/fall
Leave seed heads for wildlife and self-seeding, or cut back to ground in fall. Cut back to 2-3 inches in late fall or early spring.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with strong water jet; use miticide if severe. Improve air circulation. Mites thrive in hot, dry conditions.
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Spray with insecticidal soap or neem oil. Encourage natural predators (ladybugs, lacewings). Remove heavily infested stems.
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Improve air circulation and reduce leaf wetness. Spray with sulfur-based fungicide or baking soda solution (1 tbsp per gallon water).
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and
(Pythium, Rhizoctonia fungi)
Ensure excellent drainage. Do not overwater. Remove affected plants. Apply copper fungicide to soil if disease persists.
Uses
Herbal Tea & Infusions
CulinaryAchillea flowers and leaves can be dried and brewed into a traditional herbal tea with a slightly bitter, medicinal taste. Historically used in European folk medicine. [source]
Wound Healing & Anti-inflammatory
MedicinalYarrow contains alkaloids and flavonoids with antimicrobial and anti-inflammatory properties. Traditionally applied as a poultice or salve to wounds and minor skin irritations. [source]
Dried Flower Arrangements & Dyes
CraftThe bright yellow flowers retain color exceptionally well when dried and are ideal for dried bouquets, wreaths, and floral crafts. The plant also yields natural yellow dye for textiles. [source]
Pollinator & Beneficial Insect Magnet
WildlifeAchillea flowers attract bees, butterflies, hoverflies, and other beneficial insects that control garden pests. Essential for supporting native pollinator populations. [source]
Low-Maintenance Landscape Color
HouseholdRequires minimal water, fertilizer, or pest management once established, making it ideal for xeriscaping, rock gardens, and low-input garden designs. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut flowers for fresh arrangements when the uppermost florets have just opened; flowers last 1-2 weeks in a vase. For dried flowers, cut stems at peak bloom and hang upside down in a cool, dry location for 2-3 weeks. Deadhead spent blooms throughout summer to promote continuous flowering and prevent self-seeding (if desired).
Fun Facts
- 🌱 Achillea millefolium is named after Achilles of Greek mythology, who reportedly used yarrow to heal his soldiers' wounds during the Trojan War.
- 🌱 The feathery foliage gives yarrow its scientific species name 'millefolium,' meaning 'thousand leaves,' due to the finely divided leaflets.
- 🌱 Achillea 'Flowers of Sulfur' is sometimes called 'Coronation Gold's yellow cousin'—both are popular cultivars, but 'Flowers of Sulfur' produces a more brilliant, true yellow color.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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