Cropper mechanics

Information on how these actually work seems a bit thin, when a cropper harvests something can it reused the seed it just harvested or does that go into stores and need reassigned? If he had 5 plots of strawberries and nothing in his inventory would he keep replanting or just do nothing.

When you recharge, is there a cost or is it just a click to recharge.

If you have a range of different plot types how does he decide what goes where?