I'm not sure what the calcium situation of my water is here, I guess I could check with my neighbors. As for the spraying, I do it to keep the spider mites away. In this hot, dry climate, they will destroy your garden otherwise. However, since they highly dislike moisture, I don't have problems anymore because they don't even come to my terrace. Do tomatoes have some issue with being sprayed? I haven't noticed any problems with other plants. I would imagine the plants benefit from the "humid" nights I create. Keep in mind that humidity here on a summer day can be 15% and perhaps lower.
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