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With colourful, fluid-filled leaves, pungent scents, glistening glue or grasping tentacles, they lure their victims to a nasty end. Carnivorous plants are unique in that they attract, trap and derive benefit from digesting their prey, and they live right here in Ireland. Anyone who has walked over a bog on a still, hot day will know what a paradise they are for insects, especially the biting sort. What you may not know is that bogs are full of plants that have turned the tables on the insect world and will capture, kill and eat every midge, bug and ant they can. For amongst the mosses and heathers, or floating in shallow pools, grow sticky traps and vacuums of death. Patiently awaiting their next victim are the passive murderers; Sundews, Butterworts and Bladderworts. They rely not on strength to catch their prey, but on the lure of beauty and desire. These are carnivorous plants, a specialised group adapted to growing in nutrient poor environments. After securing their prey with the strongest glues and fastest vacuums in the natural world, they obtain nutrients from a diet of insect flesh and juices. Ten native species grow wild in Ireland, along with the introduced pitcher plant. The head of each gland is covered with a mucilaginous secretion which is acidic and enzymatic and does not evaporate. Insects may mistake the glistening leaves for nectar or may be caught because they blunder onto the leaves by chance. On average, a sundew plant traps up to five insects per month. The prey caught includes small flies, midges, beetles and ants, although larger prey such as damselflies can also become trapped by several leaves simultaneously. The plants benefit by absorbing mineral nutrients from their prey, especially nitrogen and phosphorus which are in short supply in bogs. When an insect is trapped by a sundew tentacle, the movements, which are electrically signalled, cause other tentacles to bend towards it and within three minutes there is no escape for the insect. The whole leaf bends over and closes up. This may take a day to complete. Once secure, digestive juices are released to kill, then dissolve the struggling insect, a process lasting from hours to a few days. There are three species of sundew on Irish bogs which may be distinguished from one another, by the shape of their leaves. The Round-leaved Sundew Drosera rotundifolia is most common, being found almost wherever Sphagnum moss grows. The Intermediate Sundew D. Finally, the Long-leaved Sundew D. In all species, the reddish leaves form a basal rosette, out of which arises a flowering stem with tiny white flowers. In the winter, when food is scarce the leaves die back to form a tight resting bud. Butterworts derive their name from the greasy butter-like feel of their leaves. Three species occur in Ireland. Their beautiful mauve, violet-like flowers in early summer detract from the murder weapons below. The smaller Pale Butterwort P. All butterworts grow in acid bogs, fens and occasionally on wet rocks, but none is particularly common, however the great butterwort Pinguicula grandiflora , found in the mountains and bogs of Cork and Kerry is the most conspicuous. Insects walk or fly onto the leaves, which roll at their edges to prevent escape — an unlikely occurrence — since butterworts possess the strongest natural glues known. After digestion the dry insect husk blows away. Butterworts overwinter as rootless resting buds. Bladderworts are easily overlooked, living in shallow pools and streams, their name derives from the tiny bladder-like traps on their feathery leaf stems. They are rootless, free-floating aquatics. None are common and all are difficult to identify. The bladder traps which are up to 5mm in diameter are activated by tiny trigger-hairs at the entrance to the trap. Digestive juices released inside the bladders absorb nutrients before the empty insect husk is ejected. Glands inside the bladders then absorb water out of the interior to create a vacuum and thus reset the trap. In winter the vegetative parts of the plant die back to form tight buds, which sink to the bottom of the pool. These can be caught up in currents and dispersed to new areas of the bog. Initially it was planted on a bog in Co. Since then it has been transplanted onto a dozen bogs throughout the country. The leaves of the Pitcher Plant are upright and tubular in shape, and function as pitchers in that they hold rain water, hence their common name. The green pitchers have dramatic red and purple vein markings. They form cabbage-like rosettes on bogs. The flowering stem arises out of the middle of a rosette of leaves. Pitcher plants are sophisticated invertebrate traps. First the insect is lured to the rim of the pitchers by attractive meaty-coloured patterns, and by tempting droplets of nectar. When the insect lands, it soon loses its footing on the slippery ridges around the throat of the pitcher, helped by hairs which point downward preventing its escape. The plant increases its chances of making a successful catch by spicing its nectar with intoxicating narcotic, so that the insects roll around in a drunken stupor. The walls of the pitcher are lined with slippery cells, and with no foothold to grab onto, the prisoner slowly falls into the watery depths of the pitcher. Pitcher Plants catch a wide range of invertebrates. A single pitcher naturalised in an Irish bog was found to contain prey items, mainly mites, but also caddis flies, midges, beetles, small parasitic wasps and spiders. The presence of carnivorous plants on bogs shows an interesting adaptation to a habitat that is starved of nutrients. These plants have intrigued naturalists from the time of Charles Darwin to the present day. Habitat loss is the main threat to carnivorous plants mainly from land reclamation, drainage and turf cutting. Nutrient enrichment of water and land is another threat because it increases the competition from other vegetation which shades out the carnivorous plants. Planting non native carnivorous plants in the wild boglands is not a good idea as they replace our wild bog species which are on the decline in every county in Ireland. Email: bogs ipcc. Irish Peatland Conservation Council. Skip to content. Carnivorous Plants — Killers in the Bog With colourful, fluid-filled leaves, pungent scents, glistening glue or grasping tentacles, they lure their victims to a nasty end. Round-leaved Sundew — the best known carnivorous plant. Proudly powered by WordPress. Long-leaved Sundew. The insect is trapped by the tentacles and engulfed as the modified leaf gradually closes up over it. A sundew traps up to five insects per month. Butterwort traps insects on its leaves. A Bladderwort Trap is the fastest acting of all plant traps: the victim is engulfed in less than a thousandth of a second. From left to right: When for example, a water flea touches the trigger hairs on a bladder, the door opens, releasing the partial vacuum within and sucking in the animal. In an instant the door shuts on the victim which is then digested. Bladderwort occurs in pools in bogs and fens throughout Ireland but is only noticed when the yellow flowers appear above the water surface. Pitcher Plants were introduced to Ireland in from Canada. Their fluid-filled pitchers are fatally attractive to visitors. Table of Carnivorous Plants Occurring in Ireland.