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Sunflower Russian Giant Seeds - Helianthus annuus

Helianthus annuus Russian Giant
Sunflower

5,0/5
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Hello, I plan to plant these sunflowers in a rather dry and rocky soil. Would horse manure, dry leaves, or cut grass improve the conditions for the growth and life of the sunflowers?

mélanie, 05/08/2018

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This plant carries a 6 months recovery warranty

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Value-for-money
Helianthus annuus 'Russian Giant' is an impressive variety that features huge yellow blooms with an orange-brown centre. The 3-metre-tall plants are ideal for planting in front of unsightly walls or garden sheds. Sunflowers are popular annuals that are generally direct sown in spring in ordinary, well-drained garden soil.
Flower size
30 cm
Height at maturity
3 m
Exposure
Sun
Annual / Perennial
Annual
Germination time (days)
21 days
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Sowing period March to May
J
F
M
A
M
J
J
A
S
O
N
D
Flowering time July to September
J
F
M
A
M
J
J
A
S
O
N
D

Description

Helianthus annuus 'Russian Giant' is an impressive variety that features huge yellow blooms with an orange-brown centre. The 3-metre-tall plants are ideal for planting in front of unsightly walls or garden sheds. Sunflowers are popular annuals that are generally direct sown in spring in ordinary, well-drained garden soil.

The Sunflower, or Helianthus annuus in latin, is a large annual plant belonging to the Asteraceae family, native to the Americas. It has long been domesticated for its edible seeds and is now cultivated on a large scale for its oil. 'Russian Giant' is a spectacular selection that rapidly grows to a height of 3 m. It produces large, single flowerheads (capitulum) that measure about 30 cm across. The external petals (technically, ray flowers) are bright golden yellow, arranged around a large orange-brown central disc. The flowering period lasts from July to September. The floral stems are strong and sparsely branched, covered in simple, alternate to opposite heart-shaped green leaves. They are carried on a fairly long petiole and are rough to the touch.

This easy-to-grow plant, with its large seeds and cheerful disposition, is perfect for introducing children to gardening. It is particularly suited to sunny borders and summer bedding schemes. All it requires is a healthy dose of sunshine and moist, well-drained soil. Its flowers make fabulous arrangements combined with fern leaves, goldenrod, statice and carnations for example.

Good to know: Before flowering, sunflowers famously optimize their growth by following the course of the sun in a phenomenon known as heliotropism. All summer long, sunflowers attract pollinating insects and butterflies into the garden, improving its ecosystem and encouraging fruit set in the orchard or vegetable patch. The oil-rich seeds are a favourite with garden birds (nuthatches, tits, finches, sparrows, blackbirds etc.). Harvest them after flowering to provide birds with a valuable food source during the cold winter months.

Cooking with sunflowers:

Sunflower buds, petals and seeds are all edible. Brighten up green salads with a few nutty-flavoured petals. The green buds have a Jerusalem artichoke taste when blanched and tossed in garlic butter. Unhulled seeds can be eaten both raw and grilled.

Flowering

Flower colour yellow
Flowering time July to September
Inflorescence Flower head
Flower size 30 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour medium green

Plant habit

Height at maturity 3 m
Spread at maturity 70 cm
Growth rate very fast

Botanical data

Genus

Helianthus

Species

annuus

Cultivar

Russian Giant

Family

Asteraceae

Other common names

Sunflower

Origin

Cultivar or hybrid

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Planting and care

Le Tournesol  peut être semé :

  • soit en mars-avril, en pots sous abris, pour la préparation de jeunes plants qui pourront être mis en place dans vos massifs après les dernières gelées.
  • Soit de mai à juin, après les gelées, directement en place. Dans un lieu ensoleillé de votre jardin. Afin de profiter de belles fleurs fraîches toute la saison nous vous conseillons d’échelonner vos semis au maximum.

Semez le Tournesol de mars à avril en pots. Semez vos graines par groupe de 2 à une profondeur de 1 cm.  Utilisez un terreau de bonne qualité que vous tamiserez en surface pour bien lier la graine à son substrat. Avant  de semer, tassez légèrement le terreau à l’aide d’une planchette. Recouvrez les graines en saupoudrant du terreau au dessus ou de la vermiculite, tassez légèrement et arrosez copieusement en pluie fine. Placez vos pots à la lumière, sans soleil direct, à une température de 20°c à 25°c. Baissez la température la nuit jusqu’à 17°c afin de créer une alternance bénéfique à la germination. La levée des graines prendra de 21 jours. Maintenez le terreau humide mais sans excès durant la croissance.

20 jours après l’apparition des jeunes plantes, supprimez la pousse la plus faible pour n’en garder qu’une par pot.

15 jours avant leur mise en place définitive, commencez à les acclimater progressivement jusqu’à une température de 15°c. Fin mai début juin la température sera suffisamment chaude au jardin pour y installer vos jeunes plantes. Choisissez un emplacement largement ensoleillé. Ajoutez une bonne pelletée de compost à chaque trou de plantation. Espacez vos plantes de 1 m.

La forte croissance du Tournesol demandera d’être accompagnée par des arrosages réguliers. Lorsque la plante a atteint environ 1m on peut cesser les arrosages et la laisser se contenter des pluies même si elles sont rares.

Il faut compter 75 à 80 jours entre le semis et la floraison.

Protégez vos semis des attaques des escargots et des limaces qui sont friands de ces jeunes plantes. En semant de la ciboulette à proximité de vos tournesols vous éloignerez les pucerons qui seraient tentés de s’y installer.

Sowing period

Sowing period March to May
Germination time (days) 21 days

Intended location

Suitable for Meadow
Type of use Back of border, Vegetable garden
Ease of cultivation Amateur
Exposure Sun
Soil pH Any
Soil moisture Moist soil, Drainant, riche
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