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Allseed

Radiola linoides · Linaceae

The gardener's calendar

The right move for September

Ideal time to plant allseed: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

JFMAMJJASOND Planting

ID card

Common name
Allseed
Family
Linaceae
Type
Annual or biennial herbaceous plant
Adult size
15 to 30 cm in height
Foliage
Deciduous, fine and linear
Flowering
Summer (June to September)
Hardiness
Not very hardy, sensitive to cold
Origin
Western and central Europe

Care

Light exposure

Place allseed in full light, ideally in a well-sunlit position. This small herbaceous plant also appreciates semi-shaded locations in warm climates. Good light promotes more abundant flowering and a compact form.

Watering

Keep the soil slightly moist without excess water. Water moderately and regularly, especially during growth and flowering periods. Reduce watering in autumn-winter and avoid waterlogging, which promotes fungal diseases.

Soil

Prefer well-drained, light and rather poor soil. Allseed tolerates sandy, stony or chalky soils. Soil that is too rich in organic matter may promote excessive growth at the expense of flowering.

Fertilizer

Apply very diluted fertilizer sparingly, or not at all if the soil is naturally fertile. Overfeeding stimulates foliage at the expense of flowers. A light application in spring is generally sufficient.

Pruning and maintenance

No pruning is necessary. Simply remove spent flowers to prolong flowering. At the end of the season, allow a few plants to set seed if you wish for natural reseeding the following year.

Diseases and pests

Plant in a well-aerated location to prevent rot. Excess moisture can encourage powdery mildew or fungal diseases. Watch for small insects, although this plant is generally little affected. Intervene early if problems arise.

Propagation

Easy sowing in spring, directly in place after the last frosts. Seeds are tiny: mix them with fine sand to ease distribution. Germination occurs quickly in moist soil at moderate temperature (15-20 °C).

Did you know?

Allseed (Radiola linoides) is Europe's smallest herbaceous plant, sometimes measuring barely 5 to 10 cm. Despite its microscopic size, it produces tiny white or pink flowers of remarkable delicacy. Its scientific name Radiola means 'little wheel', evoking the wheel-like form of its radiating flower clusters, and it remains rare and protected in certain regions.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.