Not weeds but tares::
(Matthew 13:24-30) "¶ Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which sowed good seed in his field: {25} But while men slept, his enemy came and sowed tares among the wheat, and went his way. {26} But when the blade was sprung up, and brought forth fruit, then appeared the tares also. {27} So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares? {28} He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up? {29} But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them. {30} Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn."
The Wheat = True followers of The LORD Jesus..
The Tares = False followers of The LORD Jesus.. Or followers of another fake jesus..
Young Tares look very much like young wheat plants.. Almost impossible to tell them apart.. It is only later that it becomes more clear because the tares produce no seeds.. No fruit..
The LORD allows the false Christian tares to exist along with the true Christians untill the harvest time ( the final judgement )
At the final judgement the Angels (reapers ) will gather the false Christians first and cast them into the lake of fire (burn them) and then the true Christians wheat into His barn ( The New Jerusalem)