You can click on any task and drag it to move that crop planting schedule to a different time of year.

Here is an example of moving a lettuce planting schedule one week later in the yearly view:
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Dragging it one week later. The rest of the tasks for the planting schedule move to match:

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Here is an example of moving a crop planting schedule in the timeline view:
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Click and dragging the lettuce planting schedule to the fall:
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Enjoy the flexibility of moving any of your planting schedules to the exact time that works best for you!