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Semences de vernonie géante - Vernonia. gigantea
Semences de vernonie géante - Vernonia. gigantea
On sale

Seeds - Giant Ironweed

Vernonia gigantea

Minimum 100 semences par enveloppe

$4.25

$4.25
( / )
Harvest year

Semences par gramme: 1 111

Année de récolte: 2024


Catégories: nectarifère, résiste aux cerfs, vivace,

Aire de répartition indigène: ON,

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For successful seedlings,
see the growing notes at the bottom of the page!

Giant ironweed (Vernonia gigantea) is an imposing perennial that adds height and elegance to gardens, often reaching over 2.5 metres. Atop its robust, upright stems, it produces clusters of vibrant purple flowers, each consisting of 30 to 50 small blooms. Its dark green lanceolate leaves contrast with its flowers bright colour, adding a dramatic touch to the landscape. Versatile and easy to grow, giant ironweed adapts well to various soil types and attracts a multitude of pollinators.

Ecological Roles
Giant ironweed plays an essential ecological role by attracting a wide variety of pollinators, including bees, butterflies, and other insects. Its flowers provide a valuable source of nectar at the end of the season. Additionally, it attracts birds that come to feed on its seeds in the fall. Its large size and sturdiness also make it an excellent plant for stabilizing soils, and it is perfectly suited for natural gardens and ecological restoration projects, where it supports local biodiversity.

 

Giant ironweed seeds require cold stratification to ensure germination. See the cultivation notes below for more details.

Akène cannot assume any responsibility for the use of plants for therapeutic purposes. Always seek advice from a professional before using a medicinal or edible plant.

Growing Notes | Seeds - Giant Ironweed

A 60-day cold stratification is necessary to ensure germination of giant ironweed seeds.

Mix the seeds with a moist substrate (vermiculite, perlite, or sand) and place them in a plastic bag in the refrigerator for 60 days.

After this period, you can sow the seeds 2 mm deep, just barely covered. Do not let the soil dry out during germination, which should take about 15 to 20 days.

You can also sow directly in the garden in the fall; stratification will occur naturally outside, but the germination rate may be reduced.

In the garden, choose a location in full sun or with very little shade, keeping in mind that this plant will be very tall (up to 3 metres under the right conditions!). Thin the plants (or space out the seedlings started indoors) 5 cm apart.

It can also be grown in large containers. Giant ironweed readily self-seeds, so if you have limited space, cut the flower heads after blooming before the wind has a chance to disperse the seeds. To keep your plants healthy, divide them every 3-4 years.

Seeds per packet: 100

Family: Asteraceae

Scientific name: Vernonia gigantea

Life cycle: Perennial

Hardiness zone: 4

Soil type: Silty to clayey

Soil moisture level: Medium to slightly moist

Soil - additional attributes: Well-drained

Light: Sun, partial shade

Blooming: July to August

Spacing: 75 cm

Height: 300 cm

Deer resistance: High

Stratification: 60 days

Scarification: No

Germination time: 15 to 20 days

Sowing depth: 2 mm