The instructions for your weed killer may state a maximum of one application a year. Presumably this is to safe guard the grass and NOT the weeds! The logic, therefore, is that the side effects of the lawn weed killer above a certain level may damage or even kill the grass. The Lawnsmith recommended weed killers, Weedol (Verdone) and Resolva , state only one treatment per year. However, we have selected them because of their different active ingredients which means you can now treat twice a year if you need to as long as you use each product just once. This only applies when spraying the whole lawn with diluted weed killer concentrate NOT ‘ready to use’ weed killers for spot treating weeds which if targeted on the weed can be used more often. Selective Lawn Weed Killer Benefits: Westland Resolva Lawn Weedkiller - wait 6 months after sowing or turfing if using the concentrate and 18 months if using the Ready to Use. Then, once autumn rolls around I’ll treat the lawn again but this time I’ll use Resolva concentrate.

In the introduction to this article, I said that you need to be very careful when choosing a weed killer for your lawn. A professional weed killer concentrate might only take 1/2 part concentrate to 3 part water but the strength of the two mixtures is exactly the same.

Conditions for using lawn weed killer

Weed killers are herbicides; a type of pesticide used to kill plants. Insecticides and fungicides are also pesticides. When using pesticides always read the label and use them safely. I rarely use Evergreen 4-in-1 because as a qualified groundsman I’ve always fed my lawn, killed weeds and killed and removed moss as separate treatments. It’s just the way I prefer to do things. We have selected two brands of weed killer; Westlands Resolva and Evergreen Weedol formerly known as Scotts Verdone. Between them they offer the broadest range of active ingredients so that if one doesn't kill a certain weed the other may. Use one brand of chemicals for 'full lawn or blanket spraying' and the other for 'spot treatment'. If you only need to ‘spot treat’ then have two different ones on hand or when one runs out buy the other one to replace it. If you know your weeds While it’s more of an all in one lawn feed, weed and moss killer, Evergreens’ 4-in-1 is a solid product for keeping on top of the weeds in your lawn. Liquid weed killers are the most common and they also offer more flexibility in terms of how you can apply them.

Scotts Weedol (Verdone) - wait 2 months after sowing or turfing though I'd be inclined to give it 3 monthsSome of the 3 star reviewers stated that the product killed most but not all of the weeds. This highlights the fact that Weedol kills over 99% of weeds but not 100%, there are a few species that won’t respond to the product and may need to be manually pulled out or treated with different chemicals. Secondly, (and this is the reason many people mix it too weak) many users don’t get an accurate measurement of their lawn. They completely underestimate how big their lawn is and only use enough concentrate for 30 square meters when in fact their lawn is 50 square meters.