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Guaranteed to Grow
Easy to Grow
Seed Saver Approved

Purity Cosmos

Quick Facts:

  • Heavenly, pure white flowers
  • Airy, dark green foliage
  • Great for arrangements
  • Grows 36-60" tall
  • Blooms summer to fall

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Quantity: Packet (250 Seeds)

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We ship to all areas of North America including the United States, its territories and outlying islands, and Canada. International orders may incur an additional charge to cover the handling of customs paperwork. Returns are accepted within 30 days of receipt. Full warranty information can be found here.

Purity Cosmos

More about Purity

Cosmos bipinnatus

Purity is a charming variety of cosmos that produces elegant, pure white flowers with cheerful yellow centers.  A staple variety for the cutting garden, Purity's simple flowers have a light, heavenly feel that works well in a wide variety of arrangements, and its airy, dark green foliage creates a nice backdrop for any bouquet or arrangement.  What's more, the flowers have a long vase life and we've noticed that they even seem to rearrange themselves over the first day, turning their flowers outward and at the same time seemingly filling in any holes in the arrangement.  Flowers that arrange themselves!  What more could a busy gardener ask for?  Attracts butterflies and other pollinators.  Plants grow... More

Less

Cosmos bipinnatus

Purity is a charming variety of cosmos that produces elegant, pure white flowers with cheerful yellow centers.  A staple variety for the cutting garden, Purity's simple flowers have a light, heavenly feel that works well in a wide variety of arrangements, and its airy, dark green foliage creates a nice backdrop for any bouquet or arrangement.  What's more, the flowers have a long vase life and we've noticed that they even seem to rearrange themselves over the first day, turning their flowers outward and at the same time seemingly filling in any holes in the arrangement.  Flowers that arrange themselves!  What more could a busy gardener ask for?  Attracts butterflies and other pollinators.  Plants grow 36 to 60 inches tall and bloom from summer through fall.  Each packet contains a minimum of 250 seeds.

Cosmos bipinnatus

Purity is a charming variety of cosmos that produces elegant, pure white flowers with cheerful yellow centers.  A staple variety for the cutting garden, Purity's simple flowers have a light, heavenly feel that works well in a wide variety of arrangements, and its airy, dark green foliage creates a nice backdrop for any bouquet or arrangement.  What's more, the flowers have a long vase life and we've noticed that they even seem to rearrange themselves over ... read more

read less

Cosmos bipinnatus

Purity is a charming variety of cosmos that produces elegant, pure white flowers with cheerful yellow centers.  A staple variety for the cutting garden, Purity's simple flowers have a light, heavenly feel that works well in a wide variety of arrangements, and its airy, dark green foliage creates a nice backdrop for any bouquet or arrangement.  What's more, the flowers have a long vase life and we've noticed that they even seem to rearrange themselves over the first day, turning their flowers outward and at the same time seemingly filling in any holes in the arrangement.  Flowers that arrange themselves!  What more could a busy gardener ask for?  Attracts butterflies and other pollinators.  Plants grow 36 to 60 inches tall and bloom from summer through fall.  Each packet contains a minimum of 250 seeds.

Flowers
Zinnia Flowers

How to Grow Cosmos

Cosmos prefer well-draining soil that is of average to poor fertility. They are tolerant of a wide variety of soil types and pH but prefer slightly alkaline soils. Cosmos will produce the greatest number of flowers when planted in full sun, however they will tolerate some shade. Remove spent blooms to encourage the development of new flowers and water only as needed. Fertilizing is not recommended.

After danger of frost has passed, sow seeds 1/4" deep into a prepared garden bed. Can also be started indoors 4-6 weeks before the last frost. After germination has occurred, thin to one plant every 12-18". Do not over-water as this will reduce blooms.

Set plants outdoors after danger of frost has passed, spacing plants at least 12" apart in all directions. Keep adequately watered until seedlings are established but avoid overwatering as this can lead to problems.

Cosmos are generally very easy to care for as they are tolerant of drought and poor soils, however they can be affected by a few diseases, particularly during wet spells. Fusarium and bacterial wilt will cause the leaves to look wilty or limp. These problems are most common when the plants receive too much shade, too much moisture, or are planted too closely together. In rural areas, corn rootworm beetles can attack the petals in late summer and fall. Unfortunately, sprays are usually not effective at controlling rootworm beetles and pose the risk of harming bees and other pollinators.

Cosmos make excellent cut flowers, with individual blooms lasting 4-6 days and vase life extended by the gradual blooming of multiple flowers along a stem. Flower preservative is recommended to maximize vase life.

CONSIDERATIONS:

Cosmos seeds are relatively easu to save. Just wait for the flowers to mature into brown seed heads. Remove the seed heads and place in a paper bag until completely dry, then separate the seeds from the seed head and place in an airtight container until ready to plant.

HARVESTING SEED:

SEED LONGETIVITY:

Cosmos seeds will remain viable for up to five years when stored under ideal conditions.

Childs hand planting a seed

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