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The Giant Hogweed is a highly invasive wildflower that can cause rashes and blisters and can cause blindness. It often can grow in excess of seven feet tall.

Heracleum, or Sosnowski's borschivny - a dangerous allergic plant that grows in the summer. Poisonous inflorescence. A poisonous perennial plant.

Close up of Hogweed or Cow Parsnip flowers found in Les Pleiades, Canton Vaud, Switzerland.

Harmful plant cow parsnip. The flower of cow parsnip. Large white inflorescences of cow parsnip close-up. Large flowers of cow parsnip at close range.

Flower of hogweed along roadside during flowering phase

A plant whose roots are used as a sedative and to treat certain medical conditions. It is being studied as a way to improve sleep in cancer patients undergoing treatment. Also called garden valerian, Indian valerian, Pacific valerian, Mexican valerian, garden heliotrope, valerian, and Valerianae radix.

Close up of a wasp flying near the flower on bright sunset sky background. Creative. Insect flying by the field plant

macro closeup of a beautiful bright blue purple flower

Cow parsnip blooms in summer in a meadow, Heracleum Sosnowskyi

The sap of it causes phytophotodermatitis in humans, resulting in blisters and long-lasting scars. Ukraine

Wildflower daisies blowing in the wind against a clear blue sky, Newquay, Cornwall.

Close up of Hogweed leaves, Heracleum sphondylium. Green leaves of hogweed, weed.

Persian onion (Allium cristophii) and goat's beard (Aruncus dioicus) bloom in the garden

Flowering Invasive Heracleum mantegazzianum the gaint hogweed

White buckwheat flowers. Buckwheat blooms on field. Buckwheat harvest

$Stout medium to tall, rather bristly biennial or short-lived perennial, to 2.5m; stem hollow, ridged. Leaves pinnate with often 5 broad, lobed and toothed segments, bristly; upper leaves with large inflated bases. Flowers white, rarely pink, 5-10mm, in large umbels up to 15cm across with 12-25 rays; petals of outer flowers very unequal; bracts few or absent. Fruit elliptical to rounded, 7-10mm, flattened and broadly winged.\nHabitat: Open woodland, banks and rough grassland.\nFlowering Season: April-September.\nDistribution: Throughout Europe, except the extreme north.\n\nGenerally the commonest umbellifer flowering during the (late) summer and quite variable.$

White wild garlic flowers. Flowering plant close-up.

dutch nature with Giant hogweed ,nature scene in sneek,friesland western europe the netherlands

Hogweed plant. Closeup of white blooming Giant Hogweed or Heracleum mantegazzianum plants in their natural habitat. weed grass

Wildflowers in a meadow recovering from a forest fire within Jasper National Park in the Canadian Rockies

Wildflowers- Blue Corn flowers in bloom- Howard County, Indiana

Heracleum sosnovskyi inflorescence on blue sky background. Heracleum sphondylium contains the intense toxic allergen furanocoumarin.

Heracleum maximum, Cow Parsnip or Indian Celery, is the only member of the genus Heracleum native to North America. Huckleberry Botanic Regional Preserve, Oakland, California. Apriaceae.

Nigella has unique seeds that bloom with refreshing blue flowers.

A beautiful field of Joe-Pye Weeds in Connecticut.

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