Blue Hydrangea means soil is acidic. 
Alkaline soil produces red Hydrangea flower. Neutral soil produces a blend of red and blue colors.
"Tell me the plant, and I'll tell you the soil it grows on." So goes the saying.
But it takes a sixth sense (practical), and an eight sense (naturalism) as well.
The Hydrangia is a classical example for the layman. To the agriculturist, the plant is the expression of the soil, from diversity to nutrient deficiency. Lack of iron (Fe) causes chlorotic shoots, low nitrogen means poor growth, lack of phosphorus poor yield.
Now hear this. There are plants that reveal the presence of mineral deposits such as gold, copper, manganese - and oil! ~
But it takes a sixth sense (practical), and an eight sense (naturalism) as well.
The Hydrangia is a classical example for the layman. To the agriculturist, the plant is the expression of the soil, from diversity to nutrient deficiency. Lack of iron (Fe) causes chlorotic shoots, low nitrogen means poor growth, lack of phosphorus poor yield.
Now hear this. There are plants that reveal the presence of mineral deposits such as gold, copper, manganese - and oil! ~
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