Draw binary tree upside down

is there a way to draw a binary tree with the root at the bottom of the image?

Yep, The trick is to set rankdir=BT (bottom-to-top) (rankdir | Graphviz)
Like so:

digraph B{
  rankdir=BT  // this sets things to bottom-up (bottom top) (https://graphviz.org/docs/attrs/rankdir/)
  a -> {b c}
  b -> {d e}
  e -> {f g}
  g-> {h i}
  c -> {j k}
  k -> {l m}


thank you. That’s exactly what I needed.