Talk:Farming/@comment-49.253.214.75-20200318185621/@comment-31225999-20200318210933

You have to keep a crop fully fertilized (with the green happy face) the whole time it grows (from planting to harvest) to get the double yield; most crops require you to add more fertilizer to their planter boxes as they grow. Keeping a crop happy only part of its growth time or just before harvest has no effect on its yield.