The yaupon holly, Ilex vomitoria, is something I have wanted to try for years. The yaupon holly is a species of holly tree native to the southeastern parts of the US. Why should you be interested in this holly tree? The berries are not edible. The leaves of the yappon holly have caffeine in them. Did I perk your interest? It is a caffeinated native to North America. You might be storing coffee in your preps. It will only last so long though.
I want sustainable caffeine. When I first found out about the Yaupon holly I knew I wanted some. Being an evergreen it does not drop it’s leaves. It grows in USDA zone 7. Though not native to TN I should have no trouble growing yaupon holly here. With permaculture you could push it further north. Let’s look into the the plant a little more and make some tea.