Why does Paul use the seed analogy for resurrection?

Paul uses the seed analogy to show that being planted in the likeness of Christ’s death guarantees being raised in the likeness of His resurrection. Just as wheat kernels planted side by side come up as wheat, believers planted with Him will come up in resurrection power, manifesting His resurrection life.

Les explains Romans 6:5 by comparing sowing and planting. Drawing on his farm background, he notes that farmers spoke of sowing oats but planting corn, yet sowing and planting mean the same thing. Paul says believers have been planted in the likeness of Christ’s death, and if so, they shall also be in the likeness of His resurrection. In I Corinthians Paul says we have been sown in corruption, but in Romans 6 he says we have been planted. Just as two kernels of wheat planted side by side will both come up as wheat, believers planted in the likeness of His death and resurrection will be resurrected in His likeness. Planted together, they come up in resurrection power together. Les stresses that this never means becoming God, but becoming the very manifestation of His resurrection power.

Romans 6:5

For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection:

Why does planting two kernels of wheat side by side show that we will be resurrected in Christ's likeness?

The two kernels illustrate that like produces like: wheat planted produces wheat. Scripture reasons that believers planted in the likeness of Christ's death will likewise be raised in the likeness of His resurrection. Being planted together, they come up together in resurrection power, manifesting His resurrection without becoming God.