Weeds in Gravel
Weeds in Gravel
Preventing weeds growing in gravel drives and pathways can be challenging. Here is a solution to provide effective long term control of weeds in gravel and stone areas.
For good weed prevention gravel and stone metalling should be at least 150 mm deep. This is rarely the case, and even if it is when initially laid, the gravel will be thinned where there is vehicle traffic. Also organic matter such as leaves and fine material from dust builds up promoting the growth of weeds.
Terbuthylazine and other pre-emergent herbicides are largely root active so herbicide applications may only wet upper surface of gravel/metalling so that residual/pre-emergent portion is not getting to soil where seed germination is occurring. Weed shoots emerging through metalling are not affected by contact with terbuthylazine on stones.
- Apply Weed Weapon Preventer at min 200 g per 10 m2. Best applied before rain or before 2 (application of Weed Weapon Long Term).
- Apply Weed Weapon Long Term at 12.5 ml/L or 125 ml per 10 L (compared to the normal dilution rate of 25 ml/L) and apply to entire site ensuring liquid reaches soil by applying at 2 L of spray per 10 m2 (which is double the normal liquid application rate). This results in the ‘correct’ level of terbuthylazine pre-emergent herbicide per m2.
The application of the dilute Weed Weapon Long Term also activates the Preventer granules which will have fallen through the gravel/stones to the soil below..
- Spot treatment of weeds could be also carried out with Weed Weapon Rapid Action or Weed Weapon Invade Gel. Invade Gel would be particularly helpful where weeds are hand weeded and root systems unable to be removed.
By David Brittain