Poisonous Garden Plants Lists

The following list are of plants which are known to be poisonous or irritant or otherwise harmful. The list is not exhaustive, or complete.

As with many things, common sense should prevail. It is well nigh impossible to remove everything which is harmless in life. Cars and all forms of transport can also be dangerous. We learn to recognise the danger, and then respect it.

Education and awareness are the determining factors.

1 - Considered to be the most dangerous - some lethal if eaten!

Aconitum - Monkshood
Arum - Cuckoo pint.
Colchicum - The autumn crocus - Can be fatal if eaten
Convallaria - Lily of the Valley
Cytisus - the Broom - All parts can be fatal if eaten.
Daphne - Shrub grown for its beautifully scented flowers - Can be Fatal
Delphinium - All parts Highly toxic - can be fatal if eaten
Digitalis - Foxgloves are everywhere and can be lethal.
Gloriosa superba - The beautiful Gloriosa Lily!
Laburnum - Beautiful golden rain flowers; Can be Fatal if eaten
Lantana - Now very popular in the summer border or planted tub!
Nerium - A beautiful conservatory plant
Phytolacca - The poke weed
Ricinus communis - Castor Oil Plant. Not to be confused with Fatsia.
Taxus - A hedge favourite.
Veratrum - The false Hellebore.

Lantana (Other colours available)

Ricinus (Castor Oil Plant) Digitalis (Foxglove)

Laburnum (Golden Rain) Daphne mezereum Rubrum

Convallaria (Lily of the Valley)

The following are also considered to be either poisonous or skin irritants.

The severity of the problems caused by skin irritant plants should not be underestimated. Once a reaction has occurred, it can cause severe skin problems for years if not life.

Some of those listed below are poisonous - some are skin allergens. There are more that we will be adding to the list as time goes by.

Aesculus - Horse Chestnut
Alstroemeria - The Peruvian Lily
Aquilegia - Garden Columbine - Ladies Bonnet
Caltha - The Marsh Marigold
Chrysanthemum - now known as Dendranthema - Severe skin irritation
Cupressocyparis Leylandii
Datura - Angels Tears
Dicentra spectabilis - Bleeding Heart
Dictamnus alba
Euonymus
Euphorbia - the Spurge
Fremontodendron - Californian Poppy
Gaultheria - Popular ground cover plant
Gloriosa Lily
Hedera helix - common ivy - or it's variegated forms
Helleborus - The Christmas or Lenten Rose
Hyacinthus - Potted or garden
Hypericum
Ipomoea - The Morning Glory (Seeds)
Iris
Juniperus sabina - Low growing Juniper (Seeds or foliage)
Kalmia - Calico Bush
Ligustrum - Privet hedges etc
Lobelia - the perennial types
Lupinus - Lupins
Narcissus - Daffodils etc
Nerium - The Oleander. Foliage is poisonous, can be fatal if eaten or chewed.
Phytolacca - The Poke Weed or Poke Root
Polygonatum - Solomon's Seal
Primula obconica - a treacherous house plant
Rhamnus - The Sea Buckthorn
Rheum - Looks like Rhubarb
Ruta graveolens - sold as a herb - even now without warning!
Scilla - beautiful bulbous plant with blue flowers
Solanum tuberosum - The POTATO green parts.
Symphytum - Comfrey has many toxic properties - A herb indeed!
Thuja occidentalis - Often sold as a hedging conifer
Tulip - The tulip bulbs can be severe skin allergen
Wisteria.
Comfrey - Sometimes white or blue flowered - Toxic!