def can be an overdose
When a plant shows a deficiency, it might actually be an overdose. Like too much potassium can cause a plant to exhibit the deficiency of magnesium and calcium. also too much salt can cause mg and ca def. either too much mg or ca will also act the same way upon each other and other elements. also wrong pH can do it. The nutrients to grow plants can be found in most plants that are already grown; so plants usually make good fertilizers for plants.