I have always planted my peppers as deep as I can when I pot them up and again when I put them out in the garden. You can't trench plant them as they obviously don't bend the way tomatoes do but you can just dig the hole deeper. Roots will grow from the stem that is buried, not as quickly as tomatoes, but they are also wider stronger roots. Have you ever seen a really big pepper plant that is way too big for its starter pack? You will see very thick white roots forming higher up on the stem and reaching down toward the soil trying to find more food/soil/water because what is has is no longer enough.
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