How we grow sweet potatoes : r vegetablegardening Harvesting + Planting Sunflowers Live Learn Lovewell This is a very extreme example, I actually poured undilutted fertilizer in the soil. Most people won't do that, so you will usually see the damage from overfertilizing as leaf tissue necrosis, as I've Four O'Clock Seeds, Mirabilis jalapa High Country Gardens Soil Moisture Meter