Below is a list of some common harmful plants and trees.

Amaryllis
Avocado
Azalea
Bird Of Paradise
Black locust
Bleeding Heart
Boxwood
Calla lily
Caladium
Castor Bean
Cheery Tree (bark, leaves & twigs)
Daffodil
Dieffenbachia
Holly
Hydrangea
Iris
Ivy,
English
Lantana
Lily-of-the-valley
Lobelia
Morning glory
Oleander
Philodendron
Poinsettia
Privet
Red Maple
Rhododendron
Rhubarb (leaves)
Sweet Pea
Wisteria
Yew, all types

Recommended Branches & Safe Foliage