Perennial weeds are plants that live for several years, surviving unfavourable seasons through their roots or other perennating organs and then producing new shoots. Many species spread vegetatively through rhizomes, root suckers, or shoots that take root. They can also reproduce by seed. Typical examples include field bindweed, common couch grass, creeping thistle, dandelion, and various dock species.
Controlling these weeds often requires considerable effort, as underground storage organs allow them to regrow repeatedly. In some species, even small root or rhizome fragments can develop into new plants. Tillage that merely fragments and disperses these organs can therefore actually promote their spread.
Effective management requires repeated measures tailored to the species concerned. These include removing underground plant parts as completely as possible, regularly removing new shoots to deplete stored reserves, and preventing seed production. Dense, competitive plant stands and appropriate crop rotations can further limit their spread.
The common dandelion is a perennial herbaceous plant that reproduces primarily by seed. t has a strong, deep-reaching taproot and preferentially grows in deep, nutrient-rich soils with high nitrogen levels. It is commonly found in meadows and pastures, as well as on other agricultural and non-agricultural land. It may also occur in multi-year forage crops. When abundant, its low-growing leaf rosette can shade and displace neighbouring plants. Its capacity to regrow enables the dandelion to withstand cutting and produce new growth afterwards.
Leaves: The leaves form a basal rosette close to the ground. They are elongated and usually toothed or deeply lobed.
Flower stalks: Leafless, hollow flower stalks emerge from the rosette.
Inflorescence: Each flower stalk bears a yellow, head-shaped inflorescence.
Fruits: After flowering, elongated, single-seeded fruits develop. Each fruit bears a parachute-like pappus.
Dispersal: The pappus enables the fruits to be dispersed by wind.
Milky latex: White milky latex is released when plant parts are broken or damaged.
Field thistle is a perennial herbaceous species with a deep-reaching root system and underground creeping roots
New shoots can develop from these roots, enabling the species to spread vegetatively
It also reproduces sexually by seed. It preferentially grows on heavy soils, such as clay soils, and on compacted sites
At high densities, it can impair crop yield formation and make harvesting more difficult
Stems: The plant develops upright, predominantly branched stems.
Leaves: The alternately arranged leaves vary in shape but are usually oblong to lance-shaped. Their margins are toothed or lobed, and the lobes often end in spines.
Inflorescences: The flowers are arranged in head-shaped inflorescences and are usually purple.
Fruits: The fruits bear a feathery pappus, which facilitates their dispersal by wind.
Field bindweed is a perennial, herbaceous plant. It has a deep-reaching taproot and an extensive system of lateral roots and underground creeping roots
Buds can form on the roots and produce new shoots. This enables the species to spread extensively by vegetative means; it also reproduces sexually by seed
Above-ground shoots grow along the ground or twine around neighbouring plants and other supports
In agricultural crops, field bindweed can overgrow crop plants and compete with them for light, water and nutrients
Dense stands can also make harvesting more difficult and cause yield losses
Stems: The stems are slender and usually branched. They either grow prostrate or twine around supports.
Leaves: The alternately arranged leaves are stalked and variable in shape. They are often ovate to arrow-shaped, with two outward-pointing lobes at the base.
Flowers: The flowers occur singly or in small numbers in the leaf axils. They are funnel-shaped and white, pink, or whitish with pink stripes.
Fruit: The fruit is a rounded to egg-shaped capsule containing several seeds.
Yellow nutsedge (Cyperus esculentus) is a perennial herbaceous sedge. It uses C₄ photosynthesis and reproduces both vegetatively and sexually
Vegetative reproduction occurs via underground rhizomes (underground stems), which form tuberous swellings at their tips. These are known as nutsedge tubers or tiger nuts
Sexual reproduction occurs via seeds. The plant flowers from summer into autumn; seed development and maturation begin in late summer or autumn, depending on the location and weather conditions
Yellow nutsedge can grow in a range of soil types; however, saying that it has no soil requirements would be an overgeneralisation
In agricultural crops, it can compete with crop plants for water, nutrients and light.
Its underground rhizomes and tubers also make it difficult to control and promote its vegetative spread
Growth habit: Perennial herbaceous plant
Height: Usually about 10–60 cm
Stems: Erect, mostly leafless and smooth; distinctly triangular in cross-section
Leaves: Narrow and grass-like; mainly basal, flat to slightly keeled, and usually shorter than or approximately as long as the stem
Underground structures: Lateral rhizomes with tuberous swellings at their tips; these tubers are commonly called nutsedge tubers or tiger nuts
Inflorescence: Branched and umbel-like, borne at the tip of the stem and usually subtended by several leaf-like bracts
Flowers: Small and inconspicuous, arranged in spikelets
Fruits: Small, usually triangular, nut-like fruits, botanically known as nutlets
Field horsetail is a perennial, herbaceous vascular spore-producing plant in the horsetail family
It produces extensive, branching underground rhizomes, which allow it to spread vegetatively. Unlike flowering plants, it produces neither flowers nor seeds, but reproduces by spores
Field horsetail is found primarily in temperate regions of the Northern Hemisphere
Typical habitats include fields, roadsides, and other open, frequently disturbed areas. It grows in a variety of soil types
Underground organs: Extensive rhizomes enable widespread vegetative propagation.
Shoot segmentation: The above-ground shoots are clearly divided into nodes and the sections between them, known as internodes.
Fertile spring shoots:
Pale to brownish and unbranched.
Bear a terminal, cone-shaped spore-producing structure called a strobilus.
Die back after releasing their spores.
Sterile shoots:
Emerge later than the fertile spring shoots.
Are upright, green and photosynthetically active.
Commonly reach a height of about 10–50 cm.
Main stem: Has a central cavity and longitudinal ridges.
Leaves: Small, scale-like leaves are fused into a sheath at each node. Their free tips form a ring of narrow teeth.
Lateral branches: Arise in whorls at the nodes of the sterile shoots. They are usually unbranched, clearly segmented and also have leaf sheaths at their nodes.
Surface: The shoots often feel rough due in part to silica deposits in the outer tissue layers.
Couch grass is a perennial herbaceous plant species belonging to the grass family
It is characterized by its extensive, creeping underground rhizomes, which store reserves and enable vegetative reproduction
Even small rhizome fragments can produce new shoots, provided they contain a viable bud. Couch grass also reproduces by seed
The species is widespread in Europe and Asia and has been introduced to other regions of the world
Typical habitats include arable fields, gardens, meadows, and roadsides. It prefers nutrient-rich, moderately moist soils
In agriculture and horticulture, couch grass is considered a persistent weed
because it competes with crops for water, nutrients, and light, and its high regenerative capacity makes it difficult to control
Height: usually about 30–120 cm.
Stems (culms): upright and divided by nodes.
Leaves: alternately arranged; leaf blades narrow and flat, often rough on the upper surface.
Ligule: short and membranous, located at the junction between the leaf sheath and blade.
Auricles: small and clasping the stem.
Inflorescence: a slender spike.
Spikelets: several-flowered, attached directly to the spike axis, with their broad side facing the axis.
Fruits: caryopses, the typical dry, one-seeded fruits of grasses.
Additional Reproductive Characteristics:
Pollination: by wind.
Flowering period: predominantly June to August in Central Europe.
Curly dock is a perennial herbaceous plant belonging to the knotweed family (Polygonaceae). It usually reaches a height of 30 to 150 cm and has a strong taproot
Curly dock is native to Europe, North Africa, and parts of Asia and has been introduced to many other regions worldwide
TTypical habitats include meadows, pastures, arable fields, and roadsides
Curly dock grows in nutrient-rich, fresh to moist soils and tolerates waterlogging and soil compaction
In agriculture, curly dock is a problematic perennial weed due to its high seed production, long seed persistence in the soil, and strong root system
It competes with crops for water, nutrients, and light, and its strong regenerative capacity makes it difficult to control
Height: usually 30–150 cm.
Stem: erect, longitudinally grooved, mostly hairless, and branched in the upper part.
Leaves:
Arranged alternately.
Basal leaves have long petioles and oblong to lanceolate leaf blades.
Leaf margins are characteristically strongly wavy to curled.
Stem leaves become smaller and have shorter petioles towards the top.
Stipular sheath (ochrea): membranous, surrounding the stem at the leaf base.
Perianth: initially greenish, consisting of six tepals.
Valves:
Develop during fruit ripening as the three inner tepals enlarge and enclose the fruit.
Broadly ovate to rounded-heart-shaped, with largely entire margins.
At least one valve usually bears a conspicuous, callus-like swelling (tubercle).
Fruit: a small, glossy brown, three-angled achene.
Fruiting structure: often turns reddish-brown to dark brown at maturity.
The blunt-leaved dock is a perennial, herbaceous plant in the knotweed family. It typically grows to a height of 30 to 150 cm and has a strong taproot. blunt-leaved dock is native to Europe, North Africa, and parts of Asia and has been introduced to many other regions worldwide. Typical habitats include meadows and pastures, farm fields, and along roadsides. Blunt-leaved dock grows in nutrient-rich, fresh to moist soils and tolerates waterlogging and soil compaction. In agriculture, blunt-leaved dock is problematic as a perennial weed due to its high seed production, long persistence in the soil, and vigorous root system. because it competes with crops for water, nutrients, and light, and its high regenerative capacity makes control difficult.
Plant height: usually 30–150 cm.
Stem: upright, longitudinally grooved, mostly hairless, and branched in the upper part.
Leaves:
Alternately arranged.
Basal leaves: long-stalked; leaf blades broad, ovate to oblong, with a usually heart-shaped base, a blunt tip, and a largely entire, slightly wavy margin.
Stem leaves: progressively smaller and narrower towards the top, with shorter stalks.
Ochrea: a membranous stipular sheath surrounding the stem at the leaf base.
Inflorescence: whorled clusters of flowers forming a branched, panicle-like inflorescence.
Flowers:
Small and usually bisexual.
Initially greenish perianth consisting of six tepals.
Valves:
Develop during fruit ripening as the three inner tepals enlarge and enclose the fruit.
Ovate to triangular, with prominent, often elongated teeth along the margins.
Usually one of the three valves bears a conspicuous, callus-like swelling.
Fruit: a small, glossy brown, three-angled nutlet.
Fruiting inflorescence: often turns reddish-brown to dark brown at maturity.
Creeping buttercup is a herbaceous perennial in the buttercup family and is widespread in Europe. Typical habitats include damp meadows and pastures, ditches, riverbanks, gardens, and arable fields. Creeping buttercup prefers nutrient-rich, moist to wet soils that are often compacted. In agriculture, creeping buttercup is a persistent weed. Fresh plant parts are poisonous. When the plant tissue is damaged, the irritant protoanemonin is produced. It can cause skin irritation and, if ingested, irritation of the mouth and gastrointestinal tract, among other symptoms.
Growth habit and height: Perennial herbaceous plant, Height: approximately 10–50 cm
Runners: Creeping, above-ground stems, Root at the nodes and produce daughter plants
Stems: Flowering stems erect to ascending, Branched and sometimes hairy
Leaves:
Alternately arranged
Basal leaves: long-stalked, with a blade usually divided into three leaflets
Leaflets lobed to deeply divided
Margins irregularly toothed
Central leaflet with a distinct stalk, a characteristic feature
Upper stem leaves: smaller, with shorter stalks or sessile
Flowers:
Bisexual and radially symmetrical
Diameter: approximately 2–3 cm
Usually five hairy sepals
Held against the petals, not bent downwards
Usually five glossy, golden-yellow petals
Each with a nectar pit at its base, covered by a small scale
Numerous stamens and free carpels in the centre of the flower
Fruits:
An aggregate of numerous small, flattened achenes
Each achene bears a short, slightly curved beak
Hedge bindweed is a perennial, herbaceous climbing plant belonging to the bindweed family (Convolvulaceae). It is widespread in Central Europe and commonly grows along fences, hedges, riverbanks, and damp roadsides. Hedge bindweed prefers nutrient-rich, moderately moist to wet soils in sunny to partially shaded locations. It spreads both by seeds and by underground rhizomes. This enables it to form dense stands and regrow after its above-ground shoots have been removed. However, the plant can become problematic because of its vigorous spread and twining growth habit. It overgrows other plants and is difficult to remove permanently due to its persistent rhizomes.
Root system: Branched and creeping, producing new above-ground shoots each year.
Stems: Thin, usually unbranched, and climbing; they twine around nearby plants or other supports.
Leaves: Arranged alternately and borne on long stalks. The leaf blades are usually arrow-shaped to heart-shaped, with two lateral lobes pointing outward.
Flowers: Large, predominantly white, funnel-shaped, and borne singly in the leaf axils. The five petals are fused.
Bracts: Two conspicuous, broad bracts surround the calyx and largely conceal it.
Fruits: Pollinated flowers may develop into rounded capsule fruits containing few seeds. Fruit production is not always prominent.
