Thunderstruck Log

Thunderstruck Log is a very rare item used primarily for crafting vehicles such as the Farm Cart. To obtain this, while any tree is in the process of growing, it has a very low chance (>1%) of being struck by lightning which will yield a Thunderstruck Log or even more rarely (>.01%), a Thunderstruck Tree which grants 5 Thunderstruck Logs.

Trees can only be struck by lightning while they're growing. Fully grown trees cannot be struck. Upon a growing tree being struck, it has a short window of time that allows it to be gathered in order to receive said item; meaning you must be present at that time in order to loot it.

The probability of a tree being struck by lightning is the same regardless of the location it's planted at. Every tree in the game is able to be struck by lightning. It's unconfirmed if taller trees such as the Sequoia have a higher probability of getting struck by lightning or not.