Plants need water and sunlight to survive, but they also need important nutrients which they receive from the soil. These nutrients are naturally occurring but can be limited in quantity if the soil has fed too many plants and not been replenished.
Some soils are also naturally less rich in important nutrients. The most critical minerals or macronutrients for plants, also known as “the big three”, are nitrogen, potassium and phosphorus and these are found in most common fertilizers for easy supplementation. However, there’s another important macronutrient that can often be overlooked by gardeners: calcium.
