3/? I suspect the horn's digestive track holds an enzyme that makes a key element that the Herd trees need to grow well in environments it would be hard to grow in other wise. The horn's home world soil is likely packed to the brim with this element.

Interesting. The herdtree's roots often reach deep into the herd's fields where their dead are buried as well. The herd and the herdtrees really are one big herd.

The answer hasn’t got any rewards yet.