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* Seed packet image is for illustration purposes only

Special Offers

ONLY £2.99 with every order!

1 x 9cm potted clematis plant ONLY £5.99 with orders over £80

1 x 9cm potted buddleja plant ONLY £4.99 with orders over £39

Delphinium grandiflorum 'Summer Nights'Delphinium chinense

Just £1.99

Hardy Perennial
What is Hardy Perennial?
A plant that lives for more than two years.
Capable of withstanding outdoor winter temperatures down to -15C.
3 Reviews

This seed is included in the 4 for 3 seed offer.
Don’t forget to check out our whole Seed Range HERE!.

1 packet (20 delphinium seeds)4 for the price of 3 on selected seeds £1.99 Despatch: within 3 Days
Description Sowing More Info Delivery Reviews

Attractive dwarf plants covered in a blanket of dainty midnight-blue flowers. Flowering in their first year from sowing makes them perfect for bedding borders or containers, providing a colourful display over a long summer period.

Useful Links:
How to sow flower seeds
Reasons to buy your seeds from Thompson & Morgan


Patio, Cottage Gardens

Hardy

Full sun

Up to 40cm (15.7in)

Up to 30cm (11.8in)

A little experience

Easy for all

1 packet (20 delphinium seeds) (25611)

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Sowing Months Flowering Months

For best results, provide any ordinary, well-drained soil in full sun

Caution: Irritant to skin and eyes. Harmful if eaten.

Sow February to April. Sow seed on the surface of lightly firmed, moist seed compost in pots or trays and cover with a fine sprinkling of compost or vermiculite. Seal container inside a polythene bag and keep at a temperature of between 18-20C (64-68F). After sowing, do not exclude light as this helps germination. Keep the surface of the compost moist but not waterlogged; germination usually takes 21 to 30 days.

When large enough to handle, transplant seedlings into 7.5cm (3 inch) pots or trays. Gradually acclimatise young plants to outdoor conditions for 10 to 15 days before planting out after all risk of frost, 23-30cm (9-12 inches) apart.

Delivery

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £1.95.

Orders which include any other products will incur a delivery charge of £4.95.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.90 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

Satisfaction Guaranteed

For your complete peace of mind, our Home and Garden products may be returned to us within 30 days of purchase for a refund of the purchase price. Items must be returned unused, at your cost and in mint condition. All items carry a manufacturer's 12 month defects warranty.

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