My experience with vinegar as a weed killer is that it turns the plant brown,
weakens it a bit, but doesn't really kill it. It invariably bounces back to
life. Putting vinegar on is equivalent to pulling the plant out but not doing a
good job of getting the root. I've had better luck with boiling water if I can
put enough on so the water is still hot when it trickles down to the root. If I
can't boil the root, it is the same old story-- dead leaves + healthy root weed that comes back.
Chelsea Christenson wrote:
It's been over a week since I used the vinegar, and I'm not seeing any
new growth, not even from the crabgrass. My impression from talking
with my master gardener (who's back from vacation now) is that the heat
from the full sun exposure (not to mention the radiant heat from the
bricks in the walk) is an important element, and that vinegar isn't
nearly as effective in shadier areas.
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