Aragonite—Use It When You Need Calcium
But Don't Need Magnesium

Agricultural aragonite is a good source of calcium, although it's low in magnesium. It consists of calcium carbonate mineral (like limestone) that comes from seashells, such as oyster shell. This fertilizer is 94% calcium carbonate in a finely ground form.

With a typical analysis of NPKCa 0-0-0-39, it conditions the soil and lowers soil acidity without adding unwanted magnesium.

It lacks the magnesium found in commonly available high-mag (dolomitic) lime and therefore is useful when magnesium levels are satisfactory but calcium is lacking.

Use it along with oyster shell. The crushed shells have multiple particle sizes and release calcium more slowly into the soil.

It's named after the Aragon region in Spain, which has rich concentrations of this product.

It's not yet a popular soil amendment mainly due to lack of availability and high price. Agricultural aragonite is popular is some parts of the country.

General usage

Apply instead of lime in situations where soil has enough magnesium and where dolomite—high magnesium limestone—is the only liming material available.

If you've routinely used dolomitic limestone to sweeten your soil, high levels of magnesium may be tying up other nutrients. Using aragonite for several seasons will restore the balance.

You can also use it to keep moles, mice, chipmunks and squirrels away from recently planted bulbs.

Instructions for Use

Use based on the outcome of a soil test. If your results indicate too much magnesium, spread aragonite on the soil and incorporate it into the top few inches.

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