We met lagom back in section 1.1 — the sense of just enough.
It is worth returning to here, because limits are where lagom
becomes a practice rather than just an idea.

Take what you need. Leave more than you take.
Come back next year and check the patch is still thriving.

It rarely feels like overharvesting in the moment.
One more handful, one more patch, one more stem — each decision
feels small. But a patch can be stripped faster than it can recover,
especially if several people are picking from the same small area.

A general guide: never take more than a third of what you find
in any one patch. Less, if the patch is small or you visit often.

Plants growing close to roads absorb pollutants from vehicle exhaust
and road runoff — heavy metals, oils, and particulates settle
on leaves and in the soil nearby.

As a general rule, avoid foraging within roughly 50 metres of busy roads,
and further for very heavily trafficked routes. The same caution applies
near industrial sites, old factories, and former industrial land —
soil contamination can persist for decades after the activity has stopped.

Land directly bordering actively farmed fields may carry pesticide
or fertiliser drift, especially close to the field edge or in drainage
ditches that carry agricultural runoff.

This doesn't mean all farmland edges are unsafe — many are fine,
particularly organic farms or fields with wide buffer zones.
But it's worth knowing what's being grown nearby,
and asking the landowner if you're unsure.

A few signs worth noticing: unusually stunted or discoloured growth
across a whole patch, an oily sheen on standing water nearby,
bare patches of ground where nothing grows at all,
or a strong chemical smell in the soil.

None of these are definitive on their own, but together
they're worth treating as a reason to forage elsewhere.

Nature reserves and protected areas may restrict or prohibit foraging
entirely, even where general jokaihmisen vastuu would otherwise apply.
Some species are protected and cannot be picked anywhere, regardless of location.

Always check local signage or municipal guidance if you're foraging
somewhere new, particularly in conservation areas.