acidifier
An additive that decreases the pH (and increases the acidity) of soil.
GardenWeb Glossary of Botanical Terms
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Acidifier: Added to vase life to lower pH; cut flowers take up acidic water more easily than higher pH water.
Citric acid: Present in citrus fruits and lemon-lime beverages; pure citric acid has a pH of about 3.0.
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It is used as a soil acidifier. Manure, peat moss, and acidic mulches like chopped oak leaves and pine needles will have a mildly acidifying effect on the soil.
To survive, flowers need three ingredients: carbohydrates, biocides, and acidifiers.
Add acidifiers like pine needles, peat moss and elemental sulfur if your soil is too alkaline.
Since many pre-mixed fertilizers that contain soil acidifiers also contain large amounts of nitrogen and phosphorus, they should not be used. Again, it is best to work with a single-element fertilizer such as muriate of potash.
They require certain trace elements which aren't available with an all purpose food, as well as a soil acidifier. The violet food will take care of these needs. African violets need about fourteen hours of bright light a day.
 See also: Water, Soil, Plant, Flower, Light
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