Marshmallow Yarrow Seed

MarshmallowYarrow Seed

Double white yarrow flowers steadily from late spring through summer
Compact plants reach approximately eighteen to thirty inches
Heat and drought tolerance simplify sunny container care
First-year bloom brings fast value to new plantings

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Key Attributes

Botanical Name

Achillea ptarmica

Days to maturity

125 Days

Sun

Full Sun

Packet

50 Seeds

Zones 3–8 Check your growing zone

About Marshmallow, Yarrow Seed, Yarrow Seed

Marshmallow yarrow is a great choice for long and consistent blooms. Produces and abundance of blooms from late spring to late summer, with double sugar-white flowers. Drought and heat tolerant, compact, 18-30 in. tall plants bloom the first year. Marshmallow is an excellent choice for containers.

Growing details

Planting

Sow Depth

1/4"

Days to Germination

10–21 days

Germination Type

C30 - Cold Moist 30 Days

In-row plant spacing

18"

Plant profile

Life Cycle

Perennial

Hardiness Zone

Zones 3-8

Plant Height

36 inches

Growth Habits

Clumping, Upright, Spreading

Seed & variety

Seeds Per Ounce

125,000

Color

White

Seed Type

Open Pollinated

Before Planting

Yarrow tolerates lean ground but requires good drainage and performs best in full sun. Remove perennial weeds, loosen the surface, and add little compost. Make a firm seedbed and cold-moist stratify seed for about 30 days before sowing.

Planting

Sow yarrow outdoors in fall or start indoors according to its germination requirement; many perennial species benefit from a cool period before warmth. Maintain even moisture during germination and provide bright light after emergence. Harden indoor-grown seedlings before planting outdoors. Transplant while young to minimize root disturbance, and thin direct sowings after sturdy true leaves develop.

Watering

Once established, yarrow prefers deep, infrequent watering. Let the surface dry between irrigations, supply extra moisture during extended heat, and avoid keeping the crown continuously wet.

Fertilizer

Fertilize yarrow modestly as new spring growth begins, following soil-test recommendations. Stop after midsummer so late tender growth does not reduce winter hardiness.

Harvesting

Yarrow flowers are ready when stems are firm and blooms show mature color without fading. Cut during cool, dry conditions; for seed, leave selected heads until brown and dry.

Tips

Deadhead yarrow frequently and trim weak or crowded stems to improve airflow. Leave a few late flowers to mature only when seed saving or natural reseeding is desired.

Pests & Diseases

Yarrow may develop powdery mildew, rust, leaf spots, or crown rot. Thin spreading colonies, remove infected stems after bloom, and keep irrigation off foliage. Divide vigorous outer growth and discard softened centers. Plants with green, distorted flower heads may have aster yellows and should be removed entirely.

Yarrow can attract aphids, thrips, spider mites, Japanese beetles, and slugs. Scout flowers and new growth regularly, handpick when practical, and protect beneficial insects with targeted controls.