Tomatoes on the plant.
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The Strange Fish Head Trick That Will Make Your Tomato Plants Thrive
An easy tip for growing plump and juicy tomatoes is burying fish heads with the plant. That may sound bizarre, but there is a science behind it.
Decaying fish heads release nitrogen and other key minerals like calcium and phosphorus into the soil, giving the tomato plant more nutrients.
Salmon, trout, and sardines are the best options as they are high in fatty acids, but any fresh, frozen, or dried fish heads work.
To prevent critters from digging it up or unpleasant odors, bury the heads one to two feet deep in the soil. Add the tomato plant on top of the hole, and fill it back up with dirt.