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A comprehensive list of poisonous flowers and plants, H-Z

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A comprehensive list of poisonous flowers and plants, H-Z
24Feb 2016

A comprehensive list of poisonous flowers and plants, H-Z

If you are going to be spending a lot of time around unfamiliar plants it makes perfect sense to familiarise yourself with the plants that could be poisonous to you, your children and your animals.  Take a look at the list below, these are the plants you should avoid picking and touching, and especially eating.  These plants can cause a range of different medical problems, from blotches and rashes, to temporary or permanent loss of sight, organ failure, and even put you into a coma or kill you.

For a list of plants and flowers to avoid, please see below, alphabetically, here are the plants H-Z:

Hedera helix: The leaves and berries are poisonous, consuming these could result in you falling into a coma.
Heracleum mantegazzianum: The sap is phototoxic, if it comes into contact with skin and this then has UV or sunlight shone upon it, it could cause a reaction.
Hippomane mancinella: All parts of this tree, including the fruit, contain toxic phorbol esters, therefore avoid eating the produce or coming into contact with the tree itself.
Hyacinthus orientalis: The bulbs are poisonous.
Hyoscyamus niger: The seeds and foliage are toxic to humans.
Ilex aquifolium: The berries on this plant can cause gastroenteritis.
Jacobaea vulgaris: This plant is poisonous to livestock.
Kalanchoe delagoensis: This plant can cause cardiac poisoning, especially when consumed by grazing animals and livestock.
Kalmia latifolia: The greenest parts of the plant, i.e. the flowers, twigs, and pollen are all highly toxic.
Laburnum: Every part of this plant, including the seeds are poisonous.
Ligustrum: The berries and leaves on this plant are poisonous.
Lilium: Lilies are extremely poisonous to human and animal, and especially to cats, consuming just 2 petals can kill a cat.
Lolium temulentum: The seeds may be poisonous as they could contain temuline and loliine.
Menispermum: The fruits and seeds of this tree are poisonous.
Narcissus: The only part of this plant this is poisonous are the bulbs.
Nerium oleander: All parts of this plant are toxic, especially the leaves and stems.
Oenanthe crocata: The stems and roots of this plant are poisonous.
Passiflora caerulea: The leaves of this plant contain cyanide.
Peucedanum galbanum: All parts are poisonous.
Physostigma venenosum: Only the seeds are poisonous.
Plumeria: This plant can cause irritation.
Phytolacca: Roots, leaves and berries are all high in toxins.
Podophyllum peltatum: Can cause severe digestive upset when consumed.
Pteridium aquilinum: When consumed this is a carcinogenic to both humans and animals.
Rhododendron: All parts are poisonous, but the effects are rarely fatal.
Ricinus communis: The seeds of this plant are poisonous.
Robinia pseudoacacia: Pods are toxic.
Sambucus: The roots are poisonous causing digestive discomfort when injested.
Solanum dulcamara: All parts are poisonous but are rarely fatal.
Solanum nigrum: All parts of the plant except the ripe fruit are toxic.
Solanum pseudocapsicum: All parts are poisonous and are occasionally fatal.
Sosnowsky’s Hogweed: Causes skin inflammation.
Strychnos nux-vomica: When consumed the seeds usually kills an adult within three hours.
Taxus baccata: Several people have committed suicide by eating the leaves and seeds of this plant.
Toxicodendron: All parts of these plants contain an irritant that causes blisters and rashes, sometimes causing infections. This is an allergen rather than a poison so will only affect certain people.
Urtica ferox: This stinging plant can cause a painful sting lasting several days.
Veratrum: All parts of the plant are poisonous, especially the root.
Xanthium: This plant can be poisonous to livestock, causing death. The seedlings and seeds are particularly toxic.
Zantedeschia: All parts of these plants contain calcium oxalate. and can be fatal.