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Thompson & Morgan Cosmos Purity - Seed Packet (100 Seeds)

Thompson & Morgan Cosmos Purity - Seed Packet (100 Seeds)

Cosmos ‘Purity’ is a beautiful flower to grow in your cottage garden, borders, or wildlife areas, ...

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B&QB&Q - Cosmos Purity 1 Seed Packet (100 Seeds)
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Robert DyasThompson & Morgan Cosmos Purity White Flower Seeds - 100 Seeds per Packet
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Product Information

Full details

Cosmos ‘Purity’ seeds from Thompson & Morgan are for gardeners seeking an elegant and low-maintenance addition to cottage gardens, borders, or wildlife areas. The key benefit is the continuous display of delicate, pearly white blooms from July to October, attracting vital pollinating insects. A minor caveat is that these are half-hardy annuals, requiring protection from frost and specific sowing conditions.

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Model Part Number24102
BrandThompson & Morgan

Extended Product Information

FAQs

When is the best time to sow Cosmos 'Purity' seeds?

Sow seeds indoors from March to May. They can also be sown directly into the ground after the last frost has passed, but indoor sowing provides a head start.

What conditions do Cosmos 'Purity' need to thrive?

Cosmos 'Purity' requires full sun and moist, well-drained soil. They appreciate a sunny spot and protection from strong winds.

How tall can Cosmos 'Purity' grow?

These plants can reach a height of up to 120cm (47.2 inches).

Can I use Cosmos 'Purity' for cut flowers?

Yes, Cosmos 'Purity' makes excellent cut flowers. Cut stems in the morning and remove lower leaves before placing in water. Regular cutting encourages more blooms.

Are Cosmos 'Purity' suitable for wildlife gardens?

Absolutely. Their blooms are highly attractive to pollinating insects like bees, making them a great addition to any wildlife-friendly garden.

What does 'half-hardy annual' mean?

A half-hardy annual is a plant that will not survive a harsh winter outdoors but can be grown as an annual in cooler climates, typically sown in spring and flowering through summer and autumn.

How far apart should I plant Cosmos 'Purity' outdoors?

Plant them outdoors approximately 45cm (18 inches) apart to allow for their mature spread and to ensure good air circulation.

Troubleshooting

Seeds not germinating

Ensure consistent moisture, adequate warmth (18-25C), and sufficient light. Seeds may also be too old; try a fresh packet if germination rates are consistently low.

Seedlings are leggy or weak

Provide more light and slightly cooler temperatures after germination. Ensure adequate spacing as they grow.

Plants not flowering well

Ensure the plant is in full sun and has adequate water. Regular deadheading of spent blooms is crucial to encourage continuous flowering.

Plants susceptible to pests

Monitor for aphids and other common garden pests. Encourage natural predators or use appropriate organic pest control methods if necessary.

Pros and Cons

Pros

  • Produces beautiful, large white flowers
  • Attracts beneficial pollinators like bees
  • Long blooming period from summer to autumn
  • Easy to cultivate, suitable for beginners
  • Adds elegance and texture to garden designs

Cons

  • Requires sowing indoors and hardening off
  • Half-hardy, sensitive to frost
  • Needs full sun and well-drained soil
  • Can grow quite tall (up to 120cm), requiring adequate space

Setup, Compatibility & Care Instructions

Sowing Seeds:

  1. Sow Cosmos seed from March to May.
  2. Use a good quality seed compost and sow at a depth of 3mm (1/8").
  3. Place seed trays in a propagator at 18-25C (64-77F) or seal in a polythene bag.
  4. Keep the soil consistently damp but not waterlogged.
  5. Light aids germination, which typically takes 7-15 days.

Potting and Transplanting:

  1. Once seedlings are large enough to handle, transplant them into 7cm (3") pots.
  2. Grow them on in cooler conditions until they are ready for outdoor planting.
  3. When plants are well-grown and all risk of frost has passed, acclimatise them to outdoor conditions over 7 to 10 days.
  4. Transplant outdoors into full sun, spaced 45cm (18") apart.

Care:

  • Position: Full sun.
  • Soil: Any moist, well-drained soil.
  • Watering: Water regularly until fully established.
  • Pinching: Pinch out the growing tip of each stem when transplanting to encourage branching and more flowers.
  • Deadheading: Regularly remove faded blooms to promote further flowering throughout the summer.

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