Assertion: comfrey | /r/HasAspect | higher levels of calcium
Facets:
value: at 2,000 ppm
type: OTHER
Source sentences:
text: If you have a look at the above mentioned spreadsheet, comfrey does have higher levels of calcium, at 2,000 ppm, but this is far below the other accumulators who are up in the 10-20,000 ppm range.