From their website:
A note about agricultural lime: Generally, agricultural lime should not be used in the EarthBox® Gardening System because it does not contain enough magnesium.
The following brands are suitable for use in the EarthBox:
EarthBox® All Natural Dolomite
Espoma Garden Lime
Whitney Farms Dolomite Lime
I used the Espoma Garden Lime in mine, which is a granular dolomite.
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