I use to have lots of praying mantis. I used systemic rose food for years, and now I have no praying mantis. I stopped using systemic in spring of 2017, and many of the good bugs have returned, but no mantis. Should I be patient, or buy Praying mantis in the garden store? If I should buy them do I wait for spring? I know lots of people buy lady bugs, but heard most of them fly away. I do have dishes I try to put water in. Unfortunately it's so hot and dry in the summer, the dish is dry more often then not. Are there other things I can do to restore the balance.