Name: Cosmos 'Purity White' Seeds
Brand: Herboo
SKU: HS020
Price: 4.00 GBP
Availability: InStock

Question 1

When should I sow Cosmos 'Purity White' indoors vs outdoors?

Accepted Answer

Start seeds indoors 4–6 weeks before your last frost (March–April) at roughly 18–20 °C. Transplant or move pots outside once frost clears, or direct sow outdoors from late April through June when the soil has warmed. Succession sowing into early September keeps new blooms coming.

Question 2

How do I keep Cosmos 'Purity White' standing tall?

Accepted Answer

Space plants about 30 cm apart and pinch the main stem at 20–25 cm to encourage bushier growth. In breezy spots, add a pea stick or low stretch of flower netting when you plant so the 80–100 cm stems stay upright all season.

Question 3

Are Cosmos 'Purity White' drought tolerant?

Accepted Answer

Once established, they cope well with dry spells. Water deeply, then let the top 2 cm of soil dry out before watering again and avoid rich feeds that cause leafy growth. Mulch pots or beds lightly in midsummer to lock in moisture without waterlogging roots.

Question 4

Are they good for pollinators and cut flowers?

Accepted Answer

Yes—Purity’s open centers feed bees and hoverflies all summer, and the long, straight stems are perfect for vases. Harvest when the first petals unfurl and sear stems briefly in boiling water to maximise vase life.

Question 5

Are these sold as plants or seeds?

Accepted Answer

Seeds only—each Herboo packet comes with full growing guidance.

Cosmos 'Purity White' Seeds

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Cosmos 'Purity White' Seeds