Been looking around for something to get rid of broadleaf weeds in
lawns, preferably something soluble that can be applied with a watering can.

Most of the commercial stuff seems to be based on MCPA and DiCamba, both
of which are in the "nasty, and I don't like it" category for me.

I have seen one Yates product in which the active ingredient is Iron
Sulphate, which is applied dry then watered in after two days (if it
doesn't rain - which ain't gonna happen any time soon here in sunny
Adelaide).

I remember seeing Jerry on Gardening Australia using equal parts Iron
Sulphate, Potassium Sulphate and sand to drop onto weeds ... which I've
done with good successes, but now I want to do a fairly large area.

I spoke to a bloke at Yates' call-centre and he recommended 200g
Ammonium Sulphate, 100g Iron Sulphate in 9 litres of water. I did some
googling and it appears this is also known as Ferrous Ammonium Sulphate,
or possibly Mohr's Salt.

Seems like the common thing is Iron Sulphate, so my question to the
assembled minds: has anyone used this stuff, and if so, how did it go?

Bonus question: is it likely to have any long-term effects (good/bad/other)?




--

Truth matters, God doesn't and life sucks.

-- House, M.D.