I suspect any organic method of eradicating the bugloss would be time and labor intensive, such as mowing, then watering and covering with thick plastic sheeting (rinse, repeat). Hopefully NZ has something like Round Up (glyphosate), which breaks down after a couple of weeks. I resist using herbicides, but am willing to use a little Round Up with the toughies.
I recommend checking into whatever herbicide you decide to use, and find out how long it lingers, and what sort of breakdown ("daughter") products are formed. Sometimes the daughters are worse than the original product, as far as the environment is concerned.
I want a tractor, too! Or maybe a Percheron.
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If men had wings and bore black feathers, few of them would be clever enough to be crows.
- Rev. Henry Ward Beecher, mid-1800s
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