The answer to "which seed" is in Ecclesiastes 11: 4-6

Ecc 11:4 He that observeth the wind shall not sow; and he that regardeth the clouds shall not reap.

Ecc 11:5 As thou knowest not what is the way of the spirit, nor how the bones do grow in the womb of her that is with child: even so thou knowest not the works of God who maketh all.

Ecc 11:6 In the morning sow thy seed, and in the evening withhold not thine hand: for thou knowest not whether shall prosper, either this or that, or whether they both shall be alike good.

Obviously we do not know which seed produces our harvest any more than we can know for sure what the wind and the clouds will do to our sowing and reaping. So what do we do?

We sow in the morning and we sow in the evening. In other words, we sow all the time. As we sow all the time, we must remember that God knows which seed will produce for any given harvest.

Since we do not know, we sow all the time. Either a morning seed or an evening seed will do it for your harvest. Consequently, we are not to outguess the wind, clouds, way of the spirit, how the bones do grow, the morning seed or the evening seed. We just sow in the morning and we just sow in the evening.

Therefore, we will sow as God has a portion and a gift for us.

God's Portion and his Gift for Us