These plants are usually deadly when damaged or frozen.

• Arrow Grass
• Black Locust
• Blue Cohosh
• Broomcarn
• Buckeye
• Cherry
• Choke Cherry
• Corn Cockle
• Dogbane
• Elderberry
• Hemp
• Horse Nettle
• Indian Hemp
• Ivy
• Johnson Grass
• Kafir
• Laurel
• Leucothoe
• Lily of the Valley
• Maleberry
• Marijuana
• Milkweed
• Milo
• Nightshade
• Oleander
• Rhododendron
• Sevenbark
• Silver
• Sneezewood
• Sorghum
• Stagger Brush
• Sudan Grass
• Velvet Grass
• White Snakeroot
• Wild Black Cherry
• Wild Hydrangea