What do you mean by a 'Madagascar Palm'? Do you mean Pachypodium? That is not a palm tree, it's a succulent. If that is what you have, then you can cut off the top with a sterile knife without killing the plant. You could probably also root the top you have cut off? If you have some actual palm tree from Madagascar, you cannot cut the top off--no way.

Thanks so much for your information njoasis. You are absolutely correct it is a Pachypodium. Thanks.

15 feet, wow! I have one about 2.5 feet tall in my living room and it's too big! :). Madagascar has some interesting plants for sure.

Hi
My neighbors have one that I know to be 32 years old and
it flowered for the first time this spring!! Huge white lacy singles with an aroma to die for .I could smell it inside my house. Curious if it will die?? gary