Poisonous Plants for Chickens

Some plants are poisonous to chickens although fortunately they are quite savvy about what not to eat and it is very rare for a chicken to eat a poisonous plant.
Here is a list of some plants that are poisonous to chickens.

Bloodroot
Bull Nettle
Bracken
Bryony
Carelessweed
Castor Bean
Cocklebur
Curly Dock
Daffodil
Delphinium
Elderberry
Fern,
Foxglove
Ground Ivy
Hemlock
Horse Chestnut
Horse Radish
Hyacinth
Hydrangea
Ivy
Laburnum
Lamb's Quarters
Lantana
Lily of the Valley
Nightshade (Also called Deadly Nightshade)
Rhododendron
Rhubarb
St. Johns Wort
Tulip
Water Hemlock (Cicuta maculata L.)
Yew