What species of pine tree are poisonous to humans if ingested?

All of them. And none of them. The poison is in the dose. If you eat a needle off of a pine tree, regardless of species, you will live. Death will not come for you - trust me, he's a friend of mine. But, if you eat a pine tree larger than a sapling, now that's a different story. read more

If you eat a needle off of a pine tree, regardless of species, you will live. Death will not come for you - trust me, he’s a friend of mine. But, if you eat a pine tree larger than a sapling, now that’s a different story. read more

Not all pine varieties are edible, however; the ponderosa pine and several others varieties of pine trees can cause illness and death in cattle and other animals.One evergreen conifer, the yew, contains a toxic substance that is potentially fatal if ingested by humans. read more

Pine (Pinus spp.) is a huge genus of evergreen trees that vary widely in size and form. Most are able to tolerate severe growing conditions, including drought, harsh winds and poor soil. The needles of many pine trees are toxic and may be dangerous, particularly to cattle and other livestock. read more