Parietaria debilis Seeds | Spreading Pellitory

Spreading Pellitory (Parietaria debilis) with slender trailing stems and small pointed downy leaves — Spreading Pellitory (*Parietaria debilis*): Urticaceae, a delicate trailing nettle relative of Australia and the Pacific.

LATIN NAME: Parietaria debilis

COMMON NAME: Spreading Pellitory

Plant Profile

Spreading Pellitory is a delicate perennial of the nettle family from Australia, New Zealand and the Pacific, trailing on slender, weak stems ten to forty centimetres long, clothed in small, pointed, downy leaves and carrying tiny greenish flowers in the leaf axils. It is a plant of shaded rocks, forest edges and old garden walls, unassuming and easily missed.

Unlike its European relatives it is a plant of warm, bright, open corners with light, free-draining ground, and it forms a soft, fine-textured mat where conditions suit it. It is a stingless nettle, harmless to touch, and a quiet presence rather than a show. The stems root where they touch damp ground, so an established patch thickens from its own edges rather than by seed alone.

Science & Biotechnology

The species sits at the southern end of the Parietaria range, and botanists of the Australasian flora treat it as a native rather than an introduction, part of the indigenous nettle flora that also holds the giant tree nettles.

Like the rest of the genus it is documented in the allergology literature through its relatives’ pollen, though this small southern species plays little part in that record; its interest is chiefly botanical and horticultural. Botanical surveys of the region place it on shaded rock faces and forest margins, and its small, quiet flowers are wind-pollinated like the rest of the genus. Taxonomists have shuffled its name across decades, a reminder that small, widespread plants often carry the most tangled synonymies in the flora.

Uses & Benefits

In the garden it suits the bright, sheltered corner: a fine, soft mat over rocks and wall bases where grass will not take, and a native species for those planting the Australasian flora.

Its folk footprint is small, a minor food and household herb of the Pacific, and its real work is the quiet one of covering difficult, dry, half-shaded edges. For gardeners of the southern flora it fills the niche between groundcovers, greening bright, dry corners without smothering neighbours. Its flowers, though tiny, are visited by small native flies and bees, adding a quiet line to the pollinator list of a southern-flora garden.

Growing from Seed

Sow on the surface of a gritty mix in a bright, cool spot, watering lightly; the seed needs light and steady but modest moisture to come up.

Grow the young plants on without over-potting, and plant them out into light, free-draining ground in a warm corner. Water sparingly once established; the plant resents wet feet and manages drought better than most soft-leaved perennials. A scattering of grit at the crown prevents winter rot, the only serious loss this soft plant suffers in cultivation. Shear the mat lightly if it thins in the centre; fresh growth closes the patch within weeks in warm weather.

Our Take

The smallest and gentlest of the pellitories: a fine, soft mat for the bright, dry corner, native to the southern seas and asking almost nothing.

Herb Seeds