Eggshells for Plants: Does Your Soil Need More Calcium?

Garden plants require calcium, but are crushed eggshells the solution? When I hear this folk garden remedy repeated, I think of it like a placebo: it makes you feel like you're doing something about a problem you may or may not even have. It's a harmless practice (if a little time consuming if you follow some of the recommendations out there) but my concern is that it often ends any real discussion about soil calcium. In this video, I'll try to shed some light on whether you really need to worry about additional calcium for your garden soil, the role of pH in the matter, and whether eggshells can make much of a difference.

My normally quite camera-shy ducks make a brief background appearance at around 5:24, BTW

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Photo credit:
Soil pH effect on nutrient availability, by CoolKoon, used under the Creative Commons Attribution 4.0 International license.