Your question is actually several in one. We are able to provide more detail with individual questions but here are some helpful suggestions. For perennials try Salvia Indigo Spires or Mystic Spires, daylilies, and Mexican bush sage. Fruit trees that require less care and spraying include persimmons and pears. For the gazebo I might go with trailing types of petunias and fan flower (Scaevola).
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