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Close up of pink Himalayan Balsam flowers and seed pods with out of focus background

In summer, the perennial plant Reynoutria grows in nature

japanese knotweed flowering, invasive weed ,classified as controlled waste under the Environmental Protection Act 1990, it grows from tiny fragments of rhizomes the underground network of stems and roots , it spreads easily and can work it's way through concrete and tarmac , its roots can go down up to 3m deep. Here in the UK the having this weed in your garden can lower the value of your house by several thousands.

European Elder or European Black Elderberry, (Sambucus nigra), flowering, Bavaria, Germany

This lovely flowering plant featuring bushy white blossoms, are considered by many in the United States and an invasive species and a pest.

Green leaves and white flowers of catalpa tree in June

$Short to medium, erect to rather sprawling, hairless, branched annual. Leaves lanceolate, tapered at the base, often with a large blackish blotch; ochrea brown, shortly fringed. Flowers crowded, in stout short spikes, pale to bright pink. Nut black, glossy.\nHabitat: Waste, bare and cultivated land, railway embankments, often close to water especially along rivers, streams and canals, sometimes abundant on heavy non-calcareous soils.\nFlowering Season: June-October.\nDistribution: Throughout Europe, except Spitsbergen.\n\nThis is a common Species in the Netherlands.$

close-up photo of a elder flower in spring season. Spring flowering of elderberries. White elderberry flowers at a bush with green leaves. Blur background. The Elderberry (Sambucus nigra)

Pink flowers of valerian (Valeriana officinalis) plant.

Crassula ovata, which is commonly called jade plant, money plant or dollar plant, is a popular branched succulent shrub, native to South Africa. Tiny flowers, which are white to pink, may appear in spring. They are widely grown as house plants, but need very bright light to grow well and a sunny position if they are to flower.

Blossoms of the Japanese Knotweed (Fallopia japonica), an invasive plant species in Europe.

Closeup native white curl flowers, Ivory Curl Tree flowers, Buckinghamia Celsissima, background with copy space, full frame horizontal composition

Flowering of the white Hydrangea Paniculata in the city park. Tardiva grade

Close up of Himalayan Balsam, also called Impatiens glandulifera or springkraut

Japanese knotweed ((Fallopia japonica)) was introduced to Britain in the 19th century as an ornamental plant, and won a gold medal at a prestigious flower show under its previous name of (Polygonum cuspidatum). However, once planted, this knotweed spread and refused to go away. Beyond the Far East, its homeland, Japanese knotweed has no natural biological enemies to check its spread. On the other hand, in Japan, at least 30 species of insect and 6 species of fungi live on the plant and restrict its spread. In 2004, a UK government review of non-native species stated the costs involved in eradication would be at least GBP1.56bn. Some other ecology-related photographs: .

branches of a flowering bush of white and purple lilac close-up, background with blooming lilac

A beetle crawls across the pink flowers of a round milk weed blossom on a July afternoon. This plant is host for the Monarch Butterfly and critical for its survival.

Inflorescences appeared from lilac flower buds. Lilac inflorescences (Latin Syringa vulgaris) in the rays of the spring sun. Spring.

Sambucus nigra. Common names include elder, elderberry, black elder, European elder, European elderberry and European black elderberry.

Purple flowerhead of the Powdery thalia (MIzukanna, Thalia dealbata Fraser ex Roscoe, close up macro photography)

Acanthus Mollis 'Bear's breeches' at The Vines Park of Rochester in Kent, England

the herbal plant Liquorice or Glycyrrhiza glabra

Blooming oregano in the garden close-up, selective focus. Used in medicine and as a herb.

A beautiful field of Joe-Pye Weeds with shallow depth of field in Connecticut.

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