What does mustard double up as? What?!
The Kingdom of heaven:
13:31 Another parable put he forth unto them, saying,
The kingdom of heaven is like to a grain of mustard seed, which a man took, and sowed in his field:
13:32 Which indeed is the least of all seeds:
but when it is grown, it is the greatest among herbs, and becometh a tree,
so that the birds of the air come and lodge in the branches thereof.
Mr Coleman, however, has informed me that Jesus knows fuck all about mustard plants, and that they will not attract edible avians in the way intimated in the parable cited above