Azalea trees that lead to lush caves should be bigger

I know azalea trees are supposed to be "bushlike", but wouldn't it be cool if the azaleas that led to lush caves were three or so times bigger? The current azalea trees just look like oak trees with flowers. What if the ones that generated in the world were 3-4 times bigger? They wouldn't be as big as mega taiga trees, but if they were thicker and twistier and taller, it would really tell the player there's something special about it.

But azalea bushes that are bonemealed into trees should only be the current size. Also, the azaleas need their own wood.