We have half a large bag of Scott's SummerGuard fertilizer that has
large caked lumps in it -- not clumps of granules, but huge
"crystalline" blocks. I don't think it ever came in contact with water;
rather, it absorbed moisture from the atmosphere.

It's too late to use it this year, but is there a reasonable way of
using it next year? Dissolve it in water and spray it on the lawn? But
how to calculate the application rate?

Perce