In the parable the servants don’t even recognize tares were sown until the blade was sprung up and brought forth fruit. Who are the servants in the parable? If they are the angels then we would have to conclude the angels aren’t aware of Satan’s activities and the angels don’t know who is or isn’t saved anymore than us humans do.
Devil planted them at night when they slept. It seems they sprouted up quickly and appear as tares when the good seed bear a crop.
24 Another parable He put forth to them, saying: “The kingdom of heaven is like a man who 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 grain had sprouted and produced a crop, then the tares also appeared.
In the parable, the good seed produced a good crop
The tares though are fruitless.
Anything the devil does is fruitless as in not bearing good fruit, and definitely bears bad fruit.
So that is how the workers could tell them apart
Tares simply use up the soil.
Matthew 3
7 But when he saw many of the Pharisees and Sadducees coming to his baptism, he said to them, “Brood of vipers! Who warned you to flee from the wrath to come? 8 Therefore bear fruits worthy of repentance, 9 and do not think to say to yourselves, ‘We have Abraham as
our father.’ For I say to you that God is able to raise up children to Abraham from these stones.
10
And even now the ax is laid to the root of the trees. Therefore every tree which does not bear good fruit is cut down and thrown into the fire. 11 I indeed baptize you with water unto repentance, but He who is coming after me is mightier than I, whose sandals I am not worthy to carry. He will baptize you with the Holy Spirit [
a]and fire. 12 His winnowing fan
is in His hand, and He will thoroughly clean out His threshing floor, and gather His wheat into the barn; but He will burn up the chaff with unquenchable fire.”
More examples of tares, John the Baptist and Christ both use fruit trees as an example of tares.
And the tares are bad, spiritually evil.
The words of Christ below is why tares cannot turn into wheat as they can not bear good fruit.
Mathew 7
15 “Beware of false prophets, who come to you in sheep’s clothing, but inwardly they are ravenous wolves. 16 You will know them by their fruits. Do men gather grapes from thornbushes or figs from thistles?
17 Even so, every good tree bears good fruit, but a bad tree bears bad fruit.
18 A good tree cannot bear bad fruit, nor can a bad tree bear good fruit.
19 Every tree that does not bear good fruit is cut down and thrown into the fire.
20 Therefore by their fruits you will know them.
I Never Knew You
21 “Not everyone who says to Me, ‘Lord, Lord,’ shall enter the kingdom of heaven, but he who does the will of My Father in heaven. 22 Many will say to Me in that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?’ 23
And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness!’
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How come Christ never knew the tares? Well, He did not plant them as the good seed in God's field the world
And the tares are the bad trees who bear bad fruit.