If clients don't mind, we leave weeds onsite to let them to rot down as compost, smother existing weeds, and to save labour and costs in removing them. Anything we can do to improve the soil’s structure and microbe population is a win.
Here’s how you can reuse organic matter (anything that once grew) and save yourself effort and money.
Learn to identify the pest, or invasive plants, (ideally when they are small) versus the less nasty weeds that will curl up and die without a fight.
It’s fine to leave the less nasty weeds on top of garden beds or around plants to rot down to improve the soil, which helps hold water and nutrients on your land.
A different approach is needed for the baddies, those that reproduce like crazy using a variety of cunning tricks. For these, you can:
To identify pest plants see Weedbusters.
Pests in Wellington region and more general info see, Greater Wellington Regional Council Pest Plants.