Short answer is your hands! What weeds have you got and are they widespread. All weed killers aren't kind to animals but once dry they are usually fine. A systemic one will work on the plant rather than the soil so I expect that's better for worms and therefore birds.
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What weeds have you got and are they widespread.
All weed killers aren't kind to animals but once dry they are usually fine.
A systemic one will work on the plant rather than the soil so I expect that's better for worms and therefore birds.