I grow gigantic sunflowers, spinich and rhubarb in a small garden. As usual, bugs are eating away at the leaves. I live in the heat of Texas. I am looking to use an organic, homemade insecticide that will not go bad when I store it in the heat of my garage for the next season or the next season.

What have you all used? The easier the better.

For years I have used this recipe for organic insecticide.
1 gal. of warm water, 1 cup of instant coffee crystals, a squirt of dish soap(not detergent), several dashes of tobasco sauce.
Spray both sides of leaves, the stems and soil surrounding
plants. You can cut this recipe just as you would reduce any recipe. I store the left over in my basement in the winter, Refresh
it the next year with a little tobasco sauce. If you make kess than gal. you could just throw it awy nd start new in the Spring. Do Not
Use Instant Powder Coffee. Won't disolve well. The soap is a
surfacant which helps insecticide stick to the leaves. I think the
key may be the tobasco sauce. Good Luck.