Weeds and Wheat

I was reading a sermon today by Barbara Brown Taylor based on the parable found in Matthew 13:24-30, 36-43.  In this passage of Matthew, Jesus tells a parable that compares the kingdom of heaven with a man who sowed good seed in his field, but while he was sleeping, weeds began to grow among the wheat.  His servants ask him if he wants them to go weed the field, removing the bad plants.  The man tells them to leave the good and bad plants alone.  He worries that in "gathering the weeds you root up the wheat along with them."

Taylor says the plant that is named in the bible is darnel -- Lolium temulentum.  It is a plant related to wheat, that looks like wheat, but is actually poisonous if the black seeds end up in the bread produced. Usually, it was weeded out so that after the reaping, the brown wheat and the black darnel didn't have to be separated.

I've never really noticed the idea that the man tells the servants not to weed the field.  You would think, if the weed is poisonous in the end product, that the risk of picking a little wheat when the servants get rid of the weeds would be worth it.  Apparently, though, for the owner of the field, the risk is too great. 

Does it speak to us today?  Does it remind us that we are not so great at telling wheat from weed -- sinner from saint?  Does it remind us that our job is not to worry about telling the difference?  We are not to judge.