Giant Rhubarb (Gunnera manicata) Non-GMO - Organically Grown - Flower

Giant Rhubarb (Gunnera manicata) Non-GMO - Organically Grown - Flower

Perennial

Large herbaceous perennial (dies back in cold conditions and regrows from the crown)

Full sun to partial shade (best growth in consistently moist, sheltered, partially shaded locations; tolerates sun only with ample water)

Full Description

Gunnera manicata, commonly known as Giant Rhubarb, is a dramatic architectural perennial prized for its enormous tropical-looking foliage. Native to Brazil, it produces massive, deeply lobed, spiny leaves that can create a bold, jungle-like focal point in any garden. In ideal conditions, mature plants form expansive clumps and send up striking cone-shaped flower spikes in early summer, followed by seed heads. This plant is especially valued for its prehistoric appearance and its ability to transform damp garden areas into lush, exotic landscapes.

Full Growing Information from Seed:

Growing Gunnera from seed is slow and requires patience. Start seeds indoors in a warm, humid environment. Sow on the surface of a moist, well-draining seed mix and press lightly—do not bury, as light can aid germination. Maintain consistent warmth around 20–24°C (68–75°F) and keep humidity high using a dome or covered tray.

Germination is very slow and irregular, often taking 4–12 weeks or longer. Once seedlings emerge, grow them on steadily in bright, indirect light with consistently moist soil. Do not allow the soil to dry out at any stage.

Transplant carefully once seedlings are large enough to handle, but avoid disturbing roots excessively as they are sensitive in early growth stages. Harden off gradually before planting outdoors in a permanently moist, sheltered location.

Medicinal Properties:

There are no well-established medicinal uses for Gunnera manicata in modern herbal practice. It is grown strictly as an ornamental plant. While some Gunnera species have had limited traditional use in local regions, this species is not considered edible or medicinal and should not be consumed.

Stratification

Yes, cold stratification recommended for 4–6 weeks (moist cold conditions improve germination rates and consistency)

Seed Count: 10