In the corner of our new yard was a mysterious stump. It didn't take long for the true identity of the tangle of milky root - within weeks spiky green stalks began poking from the cut trunk. We had a Yucca.
With a soon-to-be toddler in the house, a mess of spiky leaves at ground level seemed like a bad idea. "No problem," we thought, "let's just cut it down!"
Little did we know that Yucca are like Hercules' Hydra...just when you think you've gotten rid of them, they come back with two heads everywhere you'd cut. Time to up the ante!
Most of the advice online we found for removing Yucca involved massive quantities of herbicide, anything from ultra-concentrated Roundup to Draino to pure Diesel. We try to live as organically as possible, and the Yucca is exactly where I want to plant our vegetable garden, so this route just wasn't an option to consider.
We decided to use some elbow grease and completely dig it up. No root left behind! After a bit of an arms race with it (we are now the proud owners of a saw, an axe, and a pickaxe), we have removed the entire 3 ft circumference stump and its massive system of tentacle-like purple roots (rhizome). I've been careful to sift out the roots from surrounding soil to try to keep our Hydra from popping up another set of heads - fingers crossed we've done a good job...
I'll also be covering the area with a thick layer of newspaper to try to prevent any stragglers from popping up.
I will update if the Yucca reappears...as the pessimists (realists? more experienced yuccateers?) on Gardenweb Forums seem to say.