In article ,
"Uncle Marvo" writes:
|
| It's probably a giant chive. Really. Mine go like that. Possibly not 5', but
| definitely 4'. Has it gone hard yet?

Alliums have their flower clusters right at the top, and there are
several that grow quite tall. A. christophii, for one. But it
sounds like a sedge.

If it is a sedge, cutting it back (within reason) will not harm it.
they were commonly cropped for bedding, thatching and similar uses.


Regards,
Nick Maclaren.