how can I kill this plant?

[frugalmum]

I have a massive daylilly in my garden that has turned above-ground tuberous.  I've already dug up and divided all its "babies" which yielded 50+ plants.  However the tuberous daylilly is a dreadful eyesore, does not flower, has strange, sharp, spiky leaves, and is as thick and deep as a tree trunk so I can't just dig it up.  We don't have a chainsaw to chop it down either.  I have tried cutting back anything green and covering it with an upside down garbage can to block all light-- I just looked at it today and it is still happily sending out bright green leaves.  Is there anything else I can try short of using herbicides?

[hildare]

can you burn it?  is it far enough from your house or anything that would hurt?

[PinkinPA]

I would try drowning it with white vinegar.  I just did this with a huge comfrey plant that I had in my yard.  I used 2 1 1/2 gallon bottles of white vinegar before it worked.

[lunarlady]

I would weedwack it as low as possible, then put a layer of thick, black plastic over it. It will take awhile (weeks to months) to kill it, but the combo of heat and darkness should do it in in time.

[fiona2359]

Can you hack at it w/ an axe, pruning saw, sharp shooter shovel, or otherwise start to work it down and out? Maybe drill it in a few places and start to pull it apart? Hammer a screw driver into it here and there and chip it apart?

I had a similar experienc w/ a grapevine that a former owner planted 0" from the house. I couldn't get around it, I couldn't get under it, I couldn't do anything with it, and it kept putting out shoots. Every year I hacked at it a bit, cut off the shoots, did what I could to the stump. I kept it from spouting for a few years and this year wiht the ground very wet I was successful at finally pulling it out.

[sharr610]

F$#king daylillies.  I am still battling a fair amount in my yard...

I did a lot of research n getting rid of them and the covering them with plastic seems to be the way.  Its a long term thing, but the only option unless you can get your hands on some construction equiptment to dig it up.

Good luck!  I got most of mine up by getting under them but it was HARD work and I'm still yanking out shoots weekly.