I'm trying to find a reasonably priced supplier of Mustard seeds for green manure but I'm being thwarted somewhat by some suppliers using a 'Pack contains sufficient for 100 square yards' type description and others using '1kg pack'. 
I've searched but my google fu is not strong this morning!
Does anyone know roughly what size area a kilo would cover?

I've searched but my google fu is not strong this morning!
Does anyone know roughly what size area a kilo would cover?
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