Never seen before Weeds in Lawn

For the last 12-18months i've been getting really odd weeds that has taken over my lawn and in fact now, has badly messed it up that i shall need to sort out a new one.
I've never seen it before, and they are only growing in the lawn not flower beds.
It is like roots of a tree growing up. I've tried digging them out, but they go straight down about a foot and then shoot off sidewards and carrys on to god knows how far.
I notice the ground comes up in a large hill then after a while little shoots like spikes come up and they lead to these brown root like things.
I shall take some photos in a week or so as i have smashed them all down due to the dog hurting her paws on the spikes.
Just wanted a rough idea to google search and get an idea what i'm dealing with.
I'd really appreciate any help Thank you for your time.
--
Dromore


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Dromore said:

Have you or your neighbor cut down any trees in the past year? Do any neighbors have plantings of bamboo?
That's the best I can do with wild speculation.
--
Pat in Plymouth MI

"Yes, swooping is bad."
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On Monday, September 24, 2012 7:41:30 AM UTC-4, Pat Kiewicz wrote:

I think it was you that was good help for me in identifying Japanese switch grass when I posted a picture. Anxious to see if he posts one. I google that there is a marsh grass called spike grass. Don't know why it would grow in a lawn. If it would keep animals off my lawn, I might like some ;)
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