Mystery Plant
By Malcolm
United Kingdom 
This appeared in my greenhouse.
I didn't plant it and there's nothing like it growing nearby
It's about 5 feet high and resembles a multi-stemmed sweetcorn plant with green flower spikes at the end of each stem.
Does anybody know what it is please?
Thank you
7 Oct, 2008
Answers
anyone near you got giant grass as it could of blown into your greenhouse.
8 Oct, 2008
Could be Barnyard Grass (Echinochlioa ) . It came up in my path where I had thrown Birdseed.. It grows at great speed . Because I wondered what it was I allowed it to seed, it went on Compost heap, next year it appeared in various places, could easily become a pest. except in this country it is killed by frost.
8 Oct, 2008
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Are the stems triangular in shape? (They feel three sided). If so then it looks like Carex pendula, a sedge.
7 Oct, 2008