A plant only needs fertilizer and water?
That statement is so far out in left field. I would be going to a different retailer if this is their opinion. You and I (our bodies) need a little more than just bread and water.
Just as plant nutrition or health depends on several factors, [depending on who you speak with;] there are many different opinions
We believe; For example; Macronutrients, Micronutrients, Trace elements, Water, Light, Temperature, soil or growing medium, all play a part in plant health. Let me first explain our belief
On the Macro side are things ie: nitrogen, potassium, magnesium, calcium, phosphorus, and sulfur.
On the Micro side things like iron, zinc, molybdenum, manganese, boron, copper, cobalt, and chlorine.
As for the Trace elements, hundreds known and described. (Kelp is loaded)
Water - as with the human body a major part is water. Water and relative humidity are the most essential factors required in growth of plants. Water plays a crucial role for photosynthesis, (Plants convert carbon dioxide and water to create essential sugars through the process of photosynthesis) respiration, transpiration and transportation of minerals and other nutrients through the plant. It is taken up through the leaves as well as the root system. Plays a major part in the placement of the root system.
Light factors influence plant growth and quality
Temperature a major element that influences the growth of plants. Temperature of the surrounding atmosphere as well as the temperature of the soil matters for the plant growth.
Soil - with a combination of all of the above, along with a biologically active or an alive soil, in somewhat of a balance is a healthy home for plants
Each is needed in this balance. Some maybe at 3 to 1 others at 1000 or 10000 to 1 etc. All are needed no matter how small, to make the other be more efficient and effective. Relate this to a car - every element is needed to make it move smoothly - but - 1 flat tire or malfunction does make a difference. Other people or companies tell you about these - others prefer you don't know [they have their reasons all have to do with $$$] Some would say; - major nutrients (nitrogen, phosphorus and potassium - or N-P-K);
- minor nutrients (calcium, iron, sulphur)
- trace elements (boron, copper, magnesium, manganese, molybdenum, sodium, zinc)
And still others make the above statement "A plant only needs fertilizer and water??." If you want a healthy plant in healthy soil you need the combination.
For what it's worth ------ that's my opinion
Harold