Baking soda neutralizes the ph in the soil and nothing will grow there. use baking soda around all of the edges of flower beds to keep the grass and weeds from growing into beds. Just sprinkle it onto the soil so that it covers it lightly. Do this twice a year - spring and fall.
Fly repellent - pinner said "I had to repin this again for you to see. YES IT WORKS! Oh my, it looks hokie but our temps have been upper 90's and no flies in my back yard have been spotted. I spoke with a women who grew up on a dairy farm and she swears by it. She said they used 5 pennies. Go figure."
Mosquito trap - No more mosquitos!! Cut the top off a 2 liter bottle. Invert the cone and place it inside the straight part of the bottle. Glue the two pieces together. Add 1 tsp yeast and 1/2 cup sugar to some luke warm water, and pour the mixture into the bottle. Mosquitoes are attracted to the carbon dioxide that you exhale. The yeast feeds off the sugar and emits the same gas, so the mosquito enters the bottle, thinking she will find food there.