When the wheat sprouted and formed heads, then the weeds also appeared.
"The owner's servants came to him and said, 'Sir, didn't you sow good seed in your field? Where then did the weeds come from?'
" 'An enemy did this,' he replied. "The servants asked him, 'Do you want us to go and pull them up?'
" 'No,' he answered, 'because while you are pulling the weeds, you may root up the wheat with them.
Let both grow together until the harvest. At that time I will tell the harvesters: First collect the weeds and tie them in bundles to be burned; then gather the wheat and bring it into my barn.' "1
References for Matthew 13:30