Destroy it!
 

I call it Devils grass. It is very hard to confine and even harder to kill. It took me over a year of pain staking work to remove.

Set it on fire.

You have got to keep the stalk up against the stop plate near the handle. If you don't the blade will chatter all over the place.

Good luck! The more you cut it the more it grows! Get a backhoe & dig it out - even that won't work cuz down the road it will still grow back!! In the future selectively plant native (Fla) screening plants and manage those - much easier and looks good too! Good luck!

If they are close together, try taping several (as many as you can) together with duck tape. This will reduce the shaking. Cut below the tape. 👍 Then you can use your sawzall.

Will salt kill bamboo?

It does work if you hold the bamboo
 

The reason it does not work is that each piece being cut needs to be held so it does not vibrate or move which is the reason that it cannot cut!!!!!
He needs to get a helper to hold the piece that is being cut (use safety eye ware and Gloves) if the bamboo moves he will not be able to cut it
:boom::boom::welcome:

cutting bamboo
 

A circular saw works very well. Hold the guard back , start the saw and cut, goes thru like butter!

I've had "miniature" bamboo for 5+ years(like the kind you see around in The Villages landscaping) and am very happy with it. It really hasn't spread at all and I keep it trimmed to about 5 1/2'. I cut one of the bushes down to about 1 1/2' and keep it like that very easily. I use a hand pruner to cut it and have no problem.

I think you may be using the wrong blade, I have cut lots of wood, tree branches, even palm fonds with my sawzall and placing the saw and blade AGAINST the item to be cut with my right hand, I can use my left hand to apply force the the item to hold it against the saw and the shoe of the saw. Believe it on not, try using a metal cutting blade with very fine teeth and the high speed setting on the saw, this may help.
I could come by and demonstrate if you would like.

Dynamite!!

Cutting back bamboo—a dilemma to be solved
 

Try a cane knife or cane machete.