Let's take a look at some of Yeshua's parables to see how the theme of seed is not a careless or haphazard choice on His part, but directly relates back to the foundation of the world and the causation of our fall.

Matthew 13:18Hear ye therefore the parable of the sower.19When any one heareth the word of the kingdom, and understandeth it not, then cometh the wicked one, and catcheth away that which was sown in his heart. This is he which received seed by the way side.  20But he that received the seed into stony places, the same is he that heareth the word, and anon with joy receiveth it;  21Yet hath he not root in himself, but dureth for a while: for when tribulation or persecution ariseth because of the word, by and by he is offended.  22He also that received seed among the thorns is he that heareth the word; and the care of this world, and the deceitfulness of riches, choke the word, and he becometh unfruitful.  23But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty.

Again the theme is sowing seed.  The purpose of the seed is for it to take root and grow the plant and good fruit.  Yeshua is clear that the seed is the "word of the kingdom" and it should be sown in the heart.  We have already seen YHWH's appeal that we circumcise our hearts and He will write His torah within.  The torah is the law of His kingdom.  The final outcome of a growing plant is the production of good fruit.  Yeshua gives us another parable about seeds and the kingdom.

Matthew 13:24Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which sowed good seed in his field:  25But while men slept, his enemy came and sowed tares among the wheat, and went his way.  26But when the blade was sprung up, and brought forth fruit, then appeared the tares also.  27So 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?  28He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?  29But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them. 30Let 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.

In this parable we see a violation of the torah command about mixing seeds as we saw in Leviticus 19.  In this case it was intentionally done by an enemy of the sower of good seed.  And as we can see the nature of tares makes it impossible to root them up without damaging the good wheat.  So they are left together until the harvest where they will be separated out, one to the barn and the other to be burned.  Yeshua goes on to describe the seeds in two more parables.

Matthew 13:31Another 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:  32Which 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.

Apparently this is showing the nature of the seed of the kingdom being very small when it is planted and it grows into the largest of herbs and becomes a tree.

Matthew 13: 33Another parable spake he unto them; The kingdom of heaven is like unto leaven, which a woman took, and hid in three measures of meal, till the whole was leavened.  34All these things spake Jesus unto the multitude in parables; and without a parable spake he not unto them:  35That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world.

Here the kingdom of heaven is described as being like leaven and it is hidden, perhaps showing the nature of Israel in Diaspora and our eventual return.  Notice that it is hid in 3 measures of meal till all of the meal is leavened.    Perhaps this is showing the preaching of the Kingdom of Heaven and then in the third millennial day the harvest will take place.

The number three is indicative of resurrection as we see Yeshua's time in the grave, the first living things being made on day three of creation, Jonah in the whale's belly was for three days, and the Akeida, the sacrifice of Isaac, on the third day.  Abraham's hand was stayed from killing him, hence showing the saving of his life.  The story suggests that Isaac died and was resurrected.  YHWH prevented him from sacrificing Isaac on the third day.

Hebrews 11:8By faith Abraham, when he was called to go out into a place which he should after receive for an inheritance, obeyed; and he went out, not knowing whither he went.  9By faith he sojourned in the land of promise, as in a strange country, dwelling in tabernacles with Isaac and Jacob, the heirs with him of the same promise:  10For he looked for a city which hath foundations, whose builder and maker is God. …17By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son, 18Of whom it was said, That in Isaac shall thy seed be called: 19Accounting that God was able to raise him up, even from the dead; from whence also he received him in a figure.

Genesis 22:4Then on the third day Abraham lifted up his eyes, and saw the place afar off. 5And Abraham said unto his young men, Abide ye here with the ass; and I and the lad will go yonder and worship, and come again to you. 6And Abraham took the wood of the burnt offering, and laid it upon Isaac his son; and he took the fire in his hand, and a knife; and they went both of them together.
Yeshua goes on to explain that our relationship to Him and the Father is like the growing of tree.  And He describes this living relationship through seed, growth, and fruit.

John 15:1I am the true vine, and my Father is the husbandman.  2Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.  3Now ye are clean through the word which I have spoken unto you.  4Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.  5I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.  6If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned.  7If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you.  8Herein is my Father glorified, that ye bear much fruit; so shall ye be my disciples.  9As the Father hath loved me, so have I loved you: continue ye in my love.  10If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love.

This is how the branches stay alive and produce fruit.  This is also how they avoid being cut off and being burned.  So what happens to those branches that are cut off?  After all Israel did disobey, did YHWH cast them off forever?  NO.  There is no way we can avoid looking at all of Romans 11.