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Petunia grandiflora Double Cascade Blue

Petunia x hybrida grandiflora Double Cascade Blue
Grandiflora Petunia

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A remarkable variety of petunia. Its long trailing stems are covered, from June to the first frosts, with an avalanche of large double flowers in a deep midnight blue. It withstands rain remarkably well. Ideal for hanging baskets, containers, borders, or ground cover.
Flower size
7 cm
Height at maturity
30 cm
Exposure
Sun
Annual / Perennial
Annual
Germination time (days)
21 days
Sowing method
Sowing under cover with heat
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Sowing period March to May
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M
A
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O
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Flowering time June to October
J
F
M
A
M
J
J
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Description

The 'Double Cascade Blue' Grandiflora Petunia is a remarkable variety of Petunia. Its long trailing stems are covered in a cascade of large double flowers with a deep midnight blue colour from June to the first frost. It resists rain remarkably well—ideal for containers, hanging baskets, and borders or ground cover.

It is a highly appreciated plant of excellent ornamental value, which owes its success to its generosity and the length of its flowering period.

The 'Double Cascade Blue' Grandiflora Petunia has a trailing habit, reaching a height of 30 cm (12in), and produces long and floriferous stems. You can plant it in the garden, along borders or in the middle of a flower bed, or in pots, containers or hanging baskets where it will look stunning on its own or accompanied by Angelonia, Nemesia, Dichondra or even with Holcus mollis for a modern and contrasting effect.

Native to South America and belonging to the Solanaceae family (like Ornamental Tobacco but also... the potato!), the petunia, or Petunia x hybrida, is an annual herbaceous plant. It bears charming bell-shaped flowers on elongating stems, with the size and colour varying depending on the variety. Its leaves are slightly pubescent, with smooth edges and dark green. It flowers from June onwards and lasts until the first frost.

The petunia thrives in sunny and sheltered positions. It should be planted in rich, light and well-drained soil or substrate. Its cultivation is easy, but it requires a lot of water.

To encourage and support its long flowering period, it is advisable to regularly remove faded flowers and provide a potassium-rich fertiliser, especially in pots and containers, to promote the appearance of new flowers.

 

Attention: seeds are reserved for very experienced gardeners who are used to sowing very fine seeds. These seeds are as fine as dust, barely visible to the naked eye.

Flowering

Flower colour blue
Flowering time June to October
Inflorescence Solitary
Flower size 7 cm

Foliage

Foliage persistence Annual
Foliage colour dark green

Plant habit

Height at maturity 30 cm
Spread at maturity 35 cm
Growth rate normal

Botanical data

Genus

Petunia

Species

x hybrida grandiflora

Cultivar

Double Cascade Blue

Family

Solanaceae

Other common names

Grandiflora Petunia

Origin

Cultivar or hybrid

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Planting and care

Sow petunias on a good sowing compost surface from February to April and press gently. Cover the seeds lightly with a thin layer of vermiculite or sieved compost. Place the bowl in a propagator (or enclose it in a polythene bag) or above a radiator at a temperature of 21 to 25°C. Keep the soil moist but not soggy. Light facilitates germination, which generally takes 10 to 21 days.

Once the young petunia plants are large enough to handle, transplant them. Gradually acclimatise the plants to cooler conditions until they are strong enough to be moved outdoors once all risk of frost has passed. Transplant them into well-drained soil at a distance of 30 cm or grow them in pots or window boxes.

Sowing period

Sowing period March to May
Sowing method Sowing under cover with heat
Germination time (days) 21 days

Intended location

Type of use Border, Edge of border, Container
Ease of cultivation Amateur
Exposure Sun
Soil pH Any
Soil moisture Damp soil, Draining, rich

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