Yes, you are correct. Oyster (or clam) shells are similar to eggshells they can provide an easy source of calcium to plants for normal cell processes, root growth, and fruiting.
We haven’t used oysters but crushed eggshells are common. However, as a soil amendment (versus a slug deterrent), they really need to be ground very finely for plant uptake. If you mix them with a weak acid, such as vinegar (3% acetic acid), the chemical reaction converts the calcium into an available form. You can apply as foliar spray during the reproductive stage of a plant’s growth cycle when setting fruit and vegetables are most vulnerable to blossom-end rot.
Yes, you are correct. Oyster (or clam) shells are similar to eggshells they can provide an easy source of calcium to plants for normal cell processes, root growth, and fruiting.
We haven’t used oysters but crushed eggshells are common. However, as a soil amendment (versus a slug deterrent), they really need to be ground very finely for plant uptake. If you mix them with a weak acid, such as vinegar (3% acetic acid), the chemical reaction converts the calcium into an available form. You can apply as foliar spray during the reproductive stage of a plant’s growth cycle when setting fruit and vegetables are most vulnerable to blossom-end rot.