Is there any benefit to mixing egg shells and coffee grounds into the soil around tomato plants?
Yep, I add egg shells and coffee grounds to the soil to help add nutrients to the soil and maintain a good pH level in the soil. A common problem with tomato plants is blossom end rot on your fruit. This can be corrected by putting a small amount of lime in the soil or putting some epsom salt in the soil. Always water plants in the morning.