The Farming achievement perk gives 25% more yield, which is 4-8 (average 6).
Seeds 
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Primary Seeds Dotted Green Leaf - Green Leaf - Lime Leaf - Gold Leaf - Crystal Leaf - Striped Crystal Leaf Secondary Seeds Red Mushroom - Blewit Mushroom - Snapegrass Food Seeds Wheat - Carrot - Tomato - Potato Tree Seeds Tree - Oak Tree - Willow Tree - Maple Tree - Stardust Tree - Strange Tree - Ancient Tree - Redwood Tree Special Seeds Dark Leaf - Dark Mushroom - Grass - Stardust Seeds - Light Mushroom - Pumpkin - White Leaf - Fire Wheat - Frozen Wheat |