Put anticipated receipts and payments onto a weekly calendar through preparation, growing, harvest and buyer payment. The largest cumulative cash shortfall is the starting point for working-capital planning, with a justified contingency. Include the next batch: selling the first crop does not remove the need to buy inputs for the following one.
Check the calendar against actual bank and buyer terms before borrowing or committing to expansion. Keep a no-subsidy operating case and a delayed-start case. Review the first complete crops against the original assumptions and update the model with observed quantities rather than increasing the forecast to match a desired income.