Grace White, (F1) Clarkia Seed

Grace White (F1) Clarkia Seed

Pure white Clarkia brings lightness to mixed arrangements
Tall branching plants provide numerous usable stems
Silky cup-shaped blooms soften formal bouquet designs
Uniform growth simplifies scheduled cut-flower harvests

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Key Attributes

Botanical Name

Clarkia amoena

Days to maturity

75 Days

Sun

Full Sun

Packet

15 Seeds

About Grace White, (F1) Clarkia Seed, Clarkia Seed

This Clarkia is an excellent cut flower with good uniformity and beautiful white color. The Grace series produces cut flowers measuring 24-30 inches in height on lateral branching of up to 15 stems each carrying 5 to 6 solid clusters of blooms.

Growing details

Planting

Sow Depth

1/16"

Days to Germination

7–14 days

Germination Type

A - No Pretreatment

In-row plant spacing

9-12"

Plant profile

Life Cycle

Annual

Plant Height

30 inches

Growth Habits

Upright

Seed & variety

Seeds Per Ounce

37,000

Color

White

Seed Type

Hybrid

Before Planting

Give Clarkia a full-sun site with well-drained soil and good air circulation. Remove perennial weeds, loosen compacted ground, and incorporate modest compost without making the bed overly rich. Prepare a fine, firm seedbed. No seed pretreatment is normally required; use fresh seed and follow the sowing conditions in the Planting guidance.

Planting

Clarkia may be direct-sown in early spring, and many types also perform well from fall or winter sowing. Keep the surface evenly moist until seedlings establish, taking care not to bury light-requiring seed. Indoor starts need bright light and cool conditions. Thin direct-sown seedlings after true leaves appear, or transplant carefully before roots become crowded.

Watering

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

Fertilizer

Feed clarkia lightly after establishment with a balanced fertilizer. Repeat only if flowering or growth weakens; rich nitrogen feeding causes soft stems and delayed blooms.

Harvesting

Clarkia 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 clarkia 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

Clarkia is susceptible to damping-off, powdery mildew, Botrytis, and rust. Direct sowing into draining soil often avoids transplant-related stem rots. Thin crowded stands, remove rusted or moldy stems, and let plants finish in cool conditions; heat-stressed Clarkia declines quickly and readily develops secondary blight.

Clarkia 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.