A fertilizer (American English) or fertiliser (British English; see spelling differences) is any material of natural or synthetic origin (other than liming materials) that is applied to soils or to plant tissues to supply one or more plant nutrients essential to the growth of plants.
Soil amendments, like gypsum, are undervalued in comparison to fertilizer usage, but the bottom line is it will not matter the amount of fertilizer applied to a lawn, the plants will not be able to access key nutrients essential for growth if the soil is compacted or the chemistry is compromised.
When buying new plants for your garden the first thing you need to know is: are they hardy enough for my climatic zone? You will find the plant hardiness zone on the label attached to the plant you are going to buy, but do you really know what zone do you live in?
5. MISCELLANEOUS PROBLEMS 5.1 EXCESS NITROGEN. Nitrogen is a plant nutrient and stimulates crop growth. Natural soil nitrogen or added fertilizers are the usual sources, but nitrogen in the irrigation water has much the same effect as soil-applied fertilizer nitrogen and an excess will cause problems, just as too much fertilizer would.