Chinese parasol tree, phoenix tree
梧 refers to a specific tree, the Chinese parasol tree, also known as the phoenix tree. The meaning is narrow and botanical, without broader abstract extensions.
梧 combines 木 (tree) with 吾, which likely contributes the sound. The character was created to name the Chinese parasol tree.
The tree radical 木 beside 吾 suggests a specific tree. Picture a parasol-shaped tree with the name 吾 written on its trunk to remember it is the Chinese parasol tree.
For ゴ, imagine a parasol tree going up tall: go -> ゴ, and the tree grows straight up like a parasol.