The best time for planting trees is during times when rainfall and temperature are at a moderate level so that they have roots in the ground by the time the weather becomes hot and dry. That is why the best practice is to plant trees in the spring or fall. Spring is also associated with growth and is the best time to transplant trees. However, some trees can be dangerous to horses. Here are some trees that are toxic to your horse, especially in spring and fall.
These trees are commonly used in landscaping, but parts of it contain toxic substances. If eaten by horses in large quantities, they can lead to effects such as bloody diarrhea, colic, and renal problems. Acorns and young shoots are thought to be the parts most dangerous to horses and other livestock, though the flowers and leaves are also toxic. If you have specific questions about this you can ask your local tree disease specialist (some are listed below for reference).
This tree can poison horses through the feet when they come in contact with any part of the tree. Though the exact details of its toxicity are not well known, it is better to keep horses away and their shavings free of it because it can cause quick- or slow-onset
Other trees that are beautiful in spring and fall and great shade providers in summer such as red maple, plum, sycamore, and cherry trees can kill your horses. If you have any these trees around the pasture areas you should trim the branches so that they are not close enough for the horses to reach. You can also fence them off or if young, transplant your trees.
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