Peppers have fairly large root systems, so the deeper the container, the better for healthy plants, and larger harvests. We recommend at least 14" deep, with an ideal depth of 18-24" (think whiskey barrel size.)
For the best harvests and healthy plants, we like to plant pepper plants in deep beds, we recommend 18-24" of soil depth. Small peppers (less than one foot high) can grow well in two-gallon containers, but bigger plants need at least five-gallon pots, and all peppers thrive best with more room.
Small Containers for Peppers:
Overwatering Peppers in Containers:
This pot above is a bit on the small side in width, but it is fairly deep at around 17". The Goat Horn pepper plant did well, but she wasn't as robust as the grown in-ground plants. We'll keep planting pretty peppers in this pot as they always shine in the garden each year, and make great ornamental pepper plants.
Deep Pots + Well-Draining Potting Soil:
In the terms of the Hugel in a large pot, you can start the bottom layer either with composted or semi-composted wood chips (skip them and use soil if you have Slug / Snail problems), place a decent layer of soil (especially soil you wish to amend) on top of the latter with the Branch, Sticks, Twigs and cardboard / leaves as the carbon layer.The general rule in terms of what can be grown on the Hugel Mound in year 1, are shallow rooted crops / plants such as various lettuces. Thereafter you can grow plants that require more nutrients and moisture and then finally on year 3 you can pretty much grow anything from Tomatoes to Pumpkins.
This NuMex Twilight plant above did great in the blue pot - These are beautiful, eye-catching pepper plants that produce a rainbow of fruits that ripen from yellow, orange, then red. We let these dry out and then crushed to make hot pepper flakes. Yum!