Dahlia 'Bloody Mary' - seeds (Dahlia variabilis)

Sold: 88
In stock

These annuals are a popular addition to the landscape because they have a wide range of heights, flower shapes, sizes, and colors. This dwarf Dahlia Bloody Mary is easily grown from flower seeds and produces blooms in shades of Dark Red and Brown. When the flower seeds are started indoors in the first part of spring, Dahlias begin blooming in early summer and continue until frost.

Grow Dahlia Variabilis from dormant tuberous roots, flower seeds, rooted from cuttings, or purchased as transplants. Double-flowering types have multiple rows of petals and have large flowers. Double-flowering types, such as this one, are also classified according to flower size and shape. They prefer full sun and are very sensitive to freezing temperatures. Dahlia seeds are best planted in very warm temperatures.


Sow in Spring (March - June)

Season: Annual

Height: 14 inches (35 cm)

Bloom Season: Early summer to autumn

Bloom Color: Dark Red 

Environment: Full sun

Soil Type: Deep, fertile, well-drained soil, pH 6.0 - 6.5

Temperature: 21 - 28 C

Average Germ Time: 7 - 21 days

Light Required: Yes

Depth: Lightly cover with topsoil

Moisture: Keep seeds moist until germination

Plant Spacing: 12 inches (30 cm)

Fill cells or pots with a free-draining, seed sowing compost, and stand in water so that the compost is thoroughly damp, then allow to drain. 

Sow the seeds onto the surface of the compost and cover them with soil. Cover the trays with clear or milky polythene to maintain humidity, until the first seedlings are visible. Keep moist at all times. 

As soon as the plants are large enough to handle (approx. 3 weeks), prick out into 7cm (3in) pots to grow on at 15 to 18°C (59 to 65°F). Harden off and plant outdoors 30 to 45cm (12 to 18in) apart in soil with good nutrient content. 

Take prevention against slugs – they love Dahlia seedlings!

30 day return

30 days to change your mind

Free delivery

Free standard delivery on orders over £5


UK 2nd class delivery in 2-3 days

Excellent quality

Selected seeds from European suppliers only

Data sheet

Up to 120cm (48in)
Ideal for
Beds & borders
Bee & Butterfly garden
Cut flowers
Full sun
Sowing month
Half-hardy annual