Ive already ordered a bottle of BnA
Does it specify on the label how often to spray/water it in?
You don’t water in B&A. It’s a foliar spray. So it’ll just stick to the leaf and dry. It’s product + water in a sprayer only left to dry on the leaf.
Don’t apply on a windy day, if it’s raining, forecast to rain or the grass is wet and don’t hit plants with it. Wear PPE. B&A can be a bit of a gluggy substance. So you want to agitate the mix really well to avoid the sprayer clogging up. Add most of the water first, then product, shake/stir, then a bit more water.
It’ll all be on the label.
Ideally you’d have a calibrated backpack sprayer as they’re a bit easier to use if you’re doing a lot of it because the flow rate stays consistent. But you can just use a pump sprayer if it’s a small home area.
From memory it’s 50ml of chemical per 100m2 in your sprayer with enough water in your sprayer to broadcast over the entire lawn area.
So 0.5ml per m2. 75m2 for example would be 37.5ml.
Try to work out your m2 area as close as you can.
You want to try to spray everything evenly at a walking pace with your sprayer running out right at the end. Not running out halfway through, or having to go back over the same spots again. Walk away from the spray direction.
You can practice exactly how much water you need for your lawn area by filling it up with just water and spraying the lawn or your driveway to work out how many m2 you can spray at a comfortable walking pace before the water runs out. If you have 100m2 and put in 4L for example and run out of water with 20% of the lawn left. You’ll know you need to add another litre of water. There’s heaps of vids on YouTube about calibrating a sprayer and it’s pretty easy.
If it’s all sprayed correctly, you should only need to spray once and it’ll kill anything that is physically visible. Winter can take longer for the weeds to die off, but you’ll normally see some results within a week or so. They’ll start looking sick and shrivelled.
But like I said if new seeds haven’t germinated yet they may come back and need another hit. The old saying “one year of seeds is 7 years of weeds”.
Most of my clients I might only need to do a weedspray once a year. Once the grass is healthy and dense, the weeds get choked out too because they can’t grow without the sunlight.
Hope this helps. It probably sounds a lot harder than what it actually is, but it’s definitely the best product on the market for broadleaf weeds (clover/plantain/etc).