Effectiveness of weed killer after watering


Old 07-24-19, 04:51 AM
Thread Starter
Join Date: Feb 2019
Location: United States
Posts: 15
Received 1 Vote on 1 Post
Effectiveness of weed killer after watering

Yesterday I applied Bayer/BioAdvanced Season Long Weed Control For Lawns. We have spotted spurge and some other weeds I'm trying to get rid of. I followed the instructions and lightly watered in about 1.5 hours after application. I forgot to disable my sprinklers and the front yard zones watered this morning... The bottle says it's rain proof after 1 hour... would this impact the effectiveness of the weed killer?

Sponsored Links
Old 07-24-19, 06:18 AM
Marq1's Avatar
Join Date: Sep 2016
Location: USA MI
Posts: 4,320
Received 91 Votes on 82 Posts
The bottle says it's rain proof after 1 hour.
Can only go by what the manufacturer states, only time will tell!
Old 07-27-19, 12:22 PM
Join Date: Jan 2015
Location: United States
Posts: 448
Received 2 Votes on 2 Posts
in my experience with a vast variety of weed/grass killers is that NOT one of them actually last as long as claimed by manufacturer.
My guess is that they do their testing in a lab under very specific conditions.... however, even when I used the strongest, most residual products that claim 1 year protection from growth.....I have seen new growth within 3 months at best.

I am guessing you could do something that may not be exactly legal - as you must not modify the label direction, due to potential damage to environment, contaminating run-off water etc.... but you could buy highly concentrated product and use it at much higher level (say the label says to use 8oz per gallon - you could do 16oz or even 24 per gallon.....) At the end I still think it's all about the amount of rain and how quickly the product will get washed away and diluted below effective concentration.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes
Ask a Question
Question Title:
Your question will be posted in: