Go ahead. Just lightly water it in after sprinkling it on if you don't see rain in the weeks weather forecast.

Well you could, following Loosestrife's instructions - but I wouldn't recommend it, unless you live somewhere there are no cats, dogs or foxes - they all love fish, blood and bone and will scratch around wherever its on or in the soil, unless its at the bottom of a planting hole.

Yes, Bamboo is right, we had foxes pooing on our garden after sprinkling blood fish and bone, never again, foxes stink!