- - That answer was just SO YOU
But, gee ...
I didn't go into science fiction scenarios with mind-controlled goats taught to eat only weed! Or genetically engineered slugs and voles, or robotic, burrowing, root-pulling automatons.
But now that I know it is IVY, and how tough IVY is ... it hardly matters how long the ammonia persists. The ivy will probably be there long after the ammonia washes away or is digested by microbes and taken up by roots.
With luck any lingering ammonia will stimulate something else more than it stimulates the ivy, and something else will displace SOME of the ivy.
From what I read, ivy is tough to get rid of. I have some English Ivy in one spot, so I just pull it off the trees periodically, uproot it as often as I have energy, and don't expect anything else to grow there. Ditto with horsetail. If it ever decides to stop coming back, I'll cheer.
I limit my ambition to someday reducing the area these have taken over:
Weed #1: maybe Ranunculus / Buttercup = = = = = = =
Weed #2 probably Cardamine / Hairy Bittercress, Common Bittercress, Snapweed, Shotweed
Weed #3 is ??? = = = = = = #4 looks like Purslane, maybe Golden Purslane (Portulaca sativa)
Someone told me what this one was, but I forget the name. Wild, Spiny Lettuce?
