Galium aparine aka Stickywilly

Cleavers is extremely easy — in fact it more often arrives uninvited than by design. It self-sows prolifically, tolerates sun or partial shade, handles a wide range of soils, and needs no feeding or attention to complete its life cycle. The greater challenge is usually containing rather than establishing it.

Galium aparine grows best in partial shade, matching its natural habitat of hedgerows, woodland edges and shaded field margins. It will also thrive in full sun provided the soil stays reliably moist. Deep shade slows growth but rarely kills the plant outright.

Cleavers is a temperate-climate plant that favors the moderate to high humidity of cool, moist environments, but it is not especially humidity-sensitive. What it actually requires is adequate soil moisture rather than ambient humidity. It is rarely grown indoors, so household humidity is seldom a concern.

Cleavers is a cool-season annual that germinates at soil temperatures between about 2 and 20°C, with optimum growth between 10 and 20°C. Seedlings are remarkably frost-hardy and often overwinter in mild climates, while hot, dry summer weather triggers seed set and dieback. It performs poorly in consistently hot, arid conditions.

Cleavers reproduces almost exclusively from seed and self-sows very effectively without assistance. The bristly, bur-like fruits cling to animal fur and clothing, dispersing the plant widely — a strategy called epizoochory. To grow it deliberately, simply scatter ripe seed onto moist soil in autumn or early spring.

Stems typically reach 0.6 to 1.5 meters in length, and can scramble up to roughly 2 meters when they find support on taller vegetation or fences. The plant sprawls as much as it climbs, forming tangled mats about 1 to 2 meters across. Growth is rapid, with the whole life cycle compressed into a single growing season.

The flowers are tiny — only about 2 to 3 mm across — with four white to greenish-white petals fused into a small star shape. They appear in sparse, branching cymes from the leaf axils between May and September. Individually inconspicuous, they are easy to miss against the plant's bristly foliage.

Galium aparine is predominantly self-pollinating, which suits its inconspicuous, short-lived flowers. Small flies and occasional generalist bees may visit, contributing some cross-pollination, but reliable seed set does not require them. This reproductive self-sufficiency is part of why the plant colonizes new ground so effectively.

Sow seed directly onto moist, fertile soil in autumn or early spring, in a spot with partial shade — hedgerow edges, under shrubs or along damp fencelines suit it well. Keep the soil consistently moist until germination, after which the plant essentially looks after itself. Provide a fence, wire or neighboring vegetation for the stems to clamber through.

As a cool-season annual, seed usually germinates in autumn or very early spring, with rapid vegetative growth through spring. Flowering and seed-set run through summer, after which the plant dies back. Collect seed in late summer if you want to sow it elsewhere, and pull plants before seed matures if you want to limit spread.

Cleavers is generally robust but it is a known host for various aphid species and can harbor crop viruses such as beet yellows and turnip mosaic. It can also develop rust infections caused by Puccinia species. Otherwise, significant pest or disease damage is rare.

Yes — young shoots gathered in early spring, before the bristles toughen, can be eaten raw or, more pleasantly, lightly cooked as a potherb similar to spinach. The dried, roasted seeds make a caffeine-free coffee substitute, reflecting cleavers' close botanical relationship to true coffee (Coffea). Older stems become too bristly and fibrous to enjoy.

Cleavers has a long history in Western herbalism as a mild diuretic and lymphatic tonic, traditionally taken as a fresh-plant tincture, infusion, or cold juice. It is used in folk practice for skin complaints such as eczema and psoriasis, and as a supportive remedy for swollen glands and minor urinary complaints. These uses are traditional; clinical evidence is limited.

The tangled, bristly stems were historically used as a crude sieve for straining milk. The roots yield a red dye similar to that of the related madder (Rubia tinctorum). Cleavers is also sometimes fed to poultry, and its burr-like hitchhiking seeds are often credited as one inspiration behind George de Mestral's invention of Velcro.

Stickywilly’s native range is Europe, including Britain, from Scandanavia south and east to Spain, N. and W. Asia.

Stickywilly should be watered regularly, allowing the soil to dry out between waterings.

Stickywilly loves a well-draining soil. Perlite and vermiculite help with drainage, while coco coir adds organic matter, so a good potting soil mix will have all three. You can improve store-bought soil by adding some perlite to it.

Once the Stickywilly has doubled in size or after a year has passed, it should be moved to a new pot. By replacing the soil with fresh potting soil containing all the vital nutrients, your plant will receive all the sustenance it needs, negating the requirement for fertilizer. It's important to remember that plants get their energy from the sun, not fertilizer.

Stickywilly is not known to cause harm to humans or pets.