Subtract before you sow
You want one Spring Garlic harvest from twelve plants and are weighing a final-day date against an earlier finish. Garlic’s four-day growth time gives the deadline: 28 minus 4 equals 24. A Spring 24 planting reaches Spring 28. The final day is included, so this fits under daily watering, no growth modifiers and harvest on maturity.
There are four elapsed days between planting on 24 and harvesting on 28. Treating the planting date as an already completed growth day would produce the wrong answer. Writing the addition beside the deadline helps: 24 plus 4 equals 28. This same check works for another crop once you have its verified growth time.
Move the start to 25
Change only the planting day to Spring 25. The calculated first date becomes 29, so no harvest appears inside Spring. That is a timing result, not a smaller harvest. Reducing the bed to one plant or expanding it to twelve does not create an earlier date. Quantity and growth time are separate inputs.
The planner will describe this as outside the window. It is reporting the absence of a harvest through day 28; it is not simulating the bed in the following season. Use that result to reconsider the planting date or inspect another crop’s season and growth fields. Do not interpret it as evidence for an unmodeled cross-season rule.
A deadline is not a cushion
If your requirement is a harvest before the final day, choose Spring 23 or earlier: day 23 reaches 27, leaving one calendar day before the boundary. If a day-28 harvest meets your need, Spring 24 still fits. That later start uses the entire remaining growth window; the model adds no allowance for delayed watering or harvesting.
Garlic is a single-harvest crop in this reference. After the Spring 28 harvest, this planting’s schedule is finished. The result does not add a replacement crop or assume you will sow again. The twelve in this example is a count of plants, and the one harvest round should not be read as a verified count of produce items.
The example, calculated
Garlic · Spring 24
12 plants. First harvest: 24 + 4 = day 28. This planting has one harvest.
Spring 28