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 PexFix 71 in. H x 35 in. W White Rectangle PVC Wall Planter Box with Trellis for Climbing Plants Plantara 16 inch, 13 inch, & 10 inch D Solid White Outdoor planter,Flower Pot (Set of 3),Modern Round Plant Pot for Garden, Size: Brown Asplenium nidus (Bird's nest fern) Plantinfo