Choose your next step
Under Canopies farming and corn guides
Start with the blocker: seeds cannot go into wild soil, so check the Farming Bed prerequisite first. If your supply is gone, the Old Farm page gives a confirmed player destination for replacement corn. If corn is already growing, use the watering-can E interaction and check its plaque. These are different tasks; no exact respawn or harvest timer is promised.
Under Canopies: seeds need a Farming Bed, not wild soil
The visible v0.6.24 seed tooltip requires a Farming Bed rather than wild soil.
Replacement supply: all your corn is goneUnder Canopies: check the old farmhouse for more corn
Recheck the old farmhouse interior using the original questioner’s confirmed follow-up, with approximate timing kept explicit.
Growing crop: corn wilts before harvestUnder Canopies: water planted corn and check its status
Equip the watering can, use E near planted corn and check its plaque again as it grows.