A person holding a fresh bouquet of white Purity White cosmos flowers with yellow centers and fernlike foliage.
Purity White cosmos flowers with bright yellow centers and delicate white petals blooming among green fernlike foliage.
A bouquet of Purity White cosmos flowers with bright yellow centers and delicate white petals held in a person's hands.
Person holding a fresh bouquet of Purity White cosmos flowers with yellow centers and fernlike foliage.
Single white Purity White cosmos flower with a yellow center and fernlike green foliage.

Purity White - Cosmos Seeds

$4.99
Open-Pollinated
Quick Facts
  • Clear white blooms float above soft, ferny foliage
  • Tall, airy plants bring movement to summer borders
  • Gather loose bouquets and leave flowers for pollinators
  • 60–80 days from sowing to bloom
  • Cosmos bipinnatus
Choose size

🌱 Sow with Confidence—One-Year Seed Guarantee

Purity White cosmos brings clear white, single blooms to tall, airy plants with soft fernlike foliage. The flowers have a simple, open shape that feels fresh in the garden and elegant in a vase, especially when paired with herbs, grasses, zinnias, or blue bachelor’s buttons.

Plants bloom generously through summer with little fuss, drawing pollinators and adding movement wherever they grow. Cut often for loose bouquets, or let the white flowers drift through the row like clean light above green lace.

Orders ship from Pennsylvania within 1–2 business days via USPS. Orders $79+ ship free within the contiguous United States.

Unopened items may be returned within 30 days. If something arrives damaged, incomplete, or incorrect, we’ll make it right.

View Shipping Policy

We stand behind every packet. Our seeds are untreated, germination-tested, true to variety, and covered for one year from purchase.

If seeds arrive damaged, fail to germinate under reasonable growing conditions, or do not grow true to type, contact us and we’ll make it right with a replacement, store credit, or refund.

View Refund, Return & Guarantee Policy

FAMILY OWNED

Hand packed in Pennsylvania by our family.

LAB TESTED

Third-party tested for reliable germination.

NON-GMO

Open-pollinated varieties for home gardens & seed saving.

UNTREATED SEED

Never coated with chemical seed treatments.

Customers rate us 4.8/5 based on 317 reviews.

Cosmo Growing Basics

Cosmos are among the easiest and most rewarding flowers to grow from seed. Native to Mexico and Central America, these graceful annuals produce an abundance of daisy-like blooms held above delicate, fern-like foliage, bringing movement, color, and pollinator activity to the summer garden.

Blooming in shades of white, pink, rose, crimson, orange, yellow, and deep burgundy depending on the species, cosmos thrive in warm weather and continue flowering until frost. Their long stems make exceptional cut flowers, while the open blooms provide a valuable source of nectar and pollen for bees, butterflies, and other beneficial insects.

Direct sow cosmos after all danger of frost has passed and the soil has begun to warm. They establish quickly and generally outperform transplanted plants when sown directly into the garden.

For earlier blooms, start seeds indoors about 3–4 weeks before your last spring frost and transplant carefully after hardening off. Successive sowings every 3–4 weeks through early summer will provide fresh flowers well into autumn.

Sow seeds about ¼ inch deep and keep the soil evenly moist until germination, which usually occurs within one week under warm conditions.

Thin seedlings to 10–18 inches apart depending on the variety. Crowded plants become taller and produce fewer strong flowering stems. Choose a sunny location where plants have room to branch naturally.

Plant cosmos in full sun and well-drained soil. They perform best in average garden soil and often flower more heavily when fertility is moderate rather than excessive.

Water regularly while plants establish, then only during extended dry periods. Tall varieties may benefit from light support in windy locations. Regular harvesting or deadheading encourages continuous flowering throughout the season.

Cosmos are outstanding companion flowers for vegetable gardens, attracting native bees, butterflies, hoverflies, lacewings, and parasitic wasps that help pollinate crops and support natural pest control.

Harvest stems when the flowers have just opened and the center is beginning to flatten but before pollen is heavily shed. Cut during the cool morning hours and place stems immediately into clean water.

Frequent cutting encourages branching and continued flowering, making cosmos one of the most productive flowers for home cutting gardens.

Full Cosmo Growing Guide