Nitrogen is one of the few chemicals that can be moved within the plant.

That is, if it is not in the soil, it will be drawn from other leaves.

Calcium for example, cannot be retrieved from other places present in the plant.

Ergo, flushing and will remove nutrients the plant still needs even, and, specially in the final week(s).

Like Zandor says, it is the nitrogen you want to remove more than anything else.

Non feeding of nitro is what I have done. I do not intend to flush...