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Official Comfrey NT - Ferme de Sainte Marthe seeds

Symphytum officinale
Common Comfrey, Knitbone, Alum, Blackwort

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More information

A plant with a thousand virtues, known since antiquity as a medicinal plant. It is used in many ways: in cooking or herbalism, but especially in the garden to be used as a fertiliser and growth-stimulating liquid. It is sown in spring and autumn, but ideally from March to June.
Ease of cultivation
Beginner
Height at maturity
90 cm
Spread at maturity
60 cm
Soil moisture
Damp soil
Germination time (days)
14 days
Sowing method
Direct sowing, Sowing under cover
Sowing period March to June
J
F
M
A
M
J
J
A
S
O
N
D
Flowering time May to July
J
F
M
A
M
J
J
A
S
O
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D
Harvest time May to October
J
F
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A
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J
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Description

The Common Comfrey, known as Symphytum officinale in Latin, is a plant with many virtues, known since antiquity as a medicinal plant. It is used in many ways: in cooking or herbalism, but especially in the garden to be used as a fertiliser and growth-stimulating liquid. It can be sown in spring and autumn, but ideally from March to June.

Also known as Knitbone or Alum, the Common Comfrey belongs, like Borage, to the Boraginaceae family. It is a perennial herbaceous plant native to Europe and Western Asia, which benefits from great hardiness and can withstand temperatures as low as -30°C (-22°F).

The Greater Comfrey is vigorous and can reach, if the soil and conditions are suitable, 1.2 metres (4 feet) in height and 1.5 metres (5 feet) in width. It grows in an upright clump, with its stems and large green leaves covered in hair. It bears bell-shaped flowers from May to July, with varying colours. It is sometimes considered a "weed" as it grows spontaneously in moist environments.

In cooking, its young leaves can be added raw to mixed salads. Cooked, they can be stuffed, prepared as fritters, soups or purées. The young flower buds, with a slight marine taste, are cooked in the same way as broccoli or asparagus. However, be aware that although edible, its high alkaloid content makes it a plant to be consumed in moderation.

In herbalism, its large leaves are used as poultices to treat minor injuries as they facilitate and accelerate the healing of sprains. Excellent reparative balms, rich in allantoin, can also be made from its roots.

In the garden, Comfrey is both ornamental and growth-stimulating: rich in potassium and boron, Comfrey manure complements Nettle manure, which provides a lot of nitrogen. This manure stimulates flowering and fruiting while improving foliar resistance. The manure can also be used as an activator for composting and as a liquid fertiliser for the most demanding vegetables. It is also an excellent mulch: roughly chopped, Comfrey leaves decompose quickly, providing their nutrients to the soil. Finally, prepared as an extract, it is a good natural insecticide against aphids.

Lastly, it is worth noting that it is a plant that is attractive to bees, bumblebees and butterflies, as it is nectar-rich.

Harvest: it is carried out approximately every two weeks, from May to October, by cutting the plant to about one-third of its height.

Storage: Comfrey leaves can be well preserved by drying.


The gardener's tip: Comfrey multiplies easily, by dividing the clump but also by seed to the point of becoming... a little too present. To enjoy its benefits without suffering from an invasion, reserve a large space for it, away from other crops, and remove any unwanted spontaneous seedlings at the seedling stage, if necessary.

 

The untreated or "NT" seeds come from conventionally grown plants (often with the use of phytosanitary products), but they undergo no treatment after harvesting. These seeds are allowed in organic market gardening when organic seeds are out of stock.

Harvest

Harvest time May to October
Type of vegetable Leaf vegetable
Vegetable colour green
Size of vegetable Medium

Plant habit

Height at maturity 90 cm
Spread at maturity 60 cm
Growth rate normal

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Botanical data

Genus

Symphytum

Species

officinale

Family

Boraginaceae

Other common names

Common Comfrey, Knitbone, Alum, Blackwort

Origin

Cultivar or hybrid

Annual / Perennial

Perennial

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Planting and care

Sowing:

Common Comfrey can be sown from March to June, in full sun or partial shade.

You can choose to sow directly in the ground or prepare seedlings that will later be planted in their final position in the garden.

Preparing seedlings: In a nursery bed or in a bucket, sow the seeds at a depth of 1cm (0in) in a good seed compost. Cover lightly with compost and remember to keep the substrate moist but not waterlogged.

When the young plants appear strong enough to handle, transplant them into pots if necessary before planting them in the garden. During planting, respect the recommended spacing for direct sowing.

Direct sowing: Ideally, in moist, rich, and well-drained soil, make furrows one centimetre deep, spaced 30 centimetres (12 inches) apart. Sow the seeds with enough space between them and cover them with a thin layer of fine soil. When the seedlings are well developed, thin them out, keeping only one plant every 60 centimetres (24 inches).

Cultivation:

Common Comfrey can grow almost anywhere but thrives especially in moist and fertile soil. Remember to water it a little in the first year to help it establish properly.

Seedlings

Sowing period March to June
Sowing method Direct sowing, Sowing under cover
Germination time (days) 14 days

Care

Soil moisture Wet
Disease resistance Very good
Pruning No pruning necessary

Intended location

Type of use Vegetable garden
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Beginner
Exposure Sun, Partial shade
Soil pH Neutral
Soil type Silty-loamy (rich and light), 192

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