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Black Dahlia Flower Seeds

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Plant is at its best in October

How to grow dahlias from seed

Follow the advice in this quick guide to sow and grow dahlias from seed.

A table displaying which months are best to sow, plant and harvest.

Plant is not at its best in January

Plant is not at its best in February

Plant is not at its best in March

Plant is not at its best in April

Plant is not at its best in May

Plant is not at its best in June

Plant is not at its best in July

Plant is not at its best in August

Plant is at its best in September

Plant is at its best in October

Plant is at its best in November

Plant is not at its best in December

Do not To do in January

Do To do in February

Do To do in March

Do To do in April

Do not To do in May

Do not To do in June

Do not To do in July

Do not To do in August

Do not To do in September

Do not To do in October

Do not To do in November

Do not To do in December

Sown in late winter or early spring in a greenhouse or propagator, dahlia seeds will produce young plants ready to plant outdoors in late May to flower this year.

Seed companies sell a range of quick-growing bedding dahlias that are suitable for growing from seed. You can also use this method for sowing seeds saved from your own dahlia plants at the end of the previous season.

Follow these easy steps on how to sow dahlia seeds.

Seed companies sell a range of quick-growing bedding dahlias that are suitable for growing from seed.

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Dahlia ‘Black Beauty’ Dahlia variabilis

Luxurious velvety blooms

Short plants ideal for pots and front of border

The darkest dahlia youll grow!

Plant Size Height Up to 35cm (13.8in)
Spread Up to 35cm (13.8in)

Hardiness & Longevity Half-hardy Annual

Ideal For patio cottage gardens exotic garden cut flower garden

Position In Full sun

Sow Dahlia seeds indoors from February to April on the surface of a good, free draining compost and lightly cover with a fine sprinkling of compost or vermiculite. Place the seed tray in a propagator at a temperature of 20-25C (68-77F) or seal inside a clear polythene bag until germination which takes 7 – 21 days. Keep the compost damp but not wet and do not exclude light as this helps germination.

When seedlings are large enough to handle, transplant into 7.5cm (3″) pots and grow Dahlia plants on in cooler conditions. When all risk of frost has passed, gradually acclimatise to outdoor conditions over 7 – 10 days before planting outdoors. Plant Dahlias at a distance of 30cm (12″) apart on any fertile, well drained soil in full sun.

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 £2.99.

Orders which include any other products will incur a delivery charge of £4.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £6.99 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.

Dahlia ‘Black Beauty’ seeds from Thompson & Morgan – experts in the garden since 1855

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
At its best
At its best