Stage trees if I recall were the subject of a series of science fiction stories. They grew as boosters essentially, ignited at some point to launch and spread t

Stage trees if I recall were the subject of a series of science fiction stories. They grew as boosters essentially, ignited at some point to launch and spread their seeds. If they grew for a long time without igniting, they might leave the planet. 'The Integral Trees' also had trees in space.