Adjective for something that can continue to grow versus being terminal

I am looking for a single word that can describe something that is continuing to grow. The only term that comes to mind is viral but I am looking for something different.

For an example, an activity that continually spawns other activities.

The smaller tasks continue to grow because of the ______ task.

I'd suggest hydralike, which is an adjective form of 'hydra'.

A Hydra, according to Greek mythology, is a many-headed beast that has a curious habit of growing two more heads every time you cut one off. (Heracles/Hercules had to defeat one in his second task.)

It has taken on the meaning of:

A complex, multifarious problem or situation that cannot be solved easily and rapidly

Wiktionary

And is apt for describing problems that get increasingly complex.