Speedwell on lawn

Rosaleen Burke asked 13 years ago

In one previous question you mentioned that sulphate of iron can kill speedwell in the lawn, Do I put it out as is or can I disolve it in water and use a knapsack sprayer? – Thanks

1 Answers

Gerry Daly Staff answered 4 years ago
Sulphate of iron burns all kinds of broadleaved weeds including speedwell. The extent of the setback to weeds varies but it can be significant.

Sulphate of iron can be applied mixed in 20 parts dry sand or with a watering can or sprayer, to deliver about 6 to 10 grams per square metre.