What it is
True Yam (Dioscorea species) is in the Dioscoreaceae family. Not a sweet potato — a true tropical yam vine producing large starchy tubers for long storage. Cook before eating.
How to grow it
It wants full sun to part shade, water it moderate, and give it rich, deep soil. Target a soil pH around 5.5–6.5. Space plants about 24–36 in apart. Expect roughly 180–300. Tender perennial vine.
How it's used
True Yam is used: cooked tubers.
🔎 How to identify it
- Heart-shaped leaves
- Twining vine (often winged stems)
- Large underground tubers
Edibility
How to grow & propagate true yam
Everything I've worked out about starting this one, keeping it alive through a Texas year, and turning one plant into many — free.
How to propagate true yam
True Yam comes up from seed and, once it's a few years old, can be lifted and divided in cool weather to make more plants and keep the clump vigorous.
Growing true yam in Texas
Give it full sun to part shade and rich, deep soil. Match the spot to the plant and most of the battle is already won.
This one thrives in heat that flattens other plants, so it earns its space through a Texas summer. Get it established before the worst of July, keep water steady, and it'll produce when little else will.
Keep moisture even, especially while it's young — deep, less-frequent soaks build better roots than a daily sprinkle.
Harvesting
Figure on roughly 180–300 before you're harvesting. Harvest at peak and keep harvesting — most vegetables produce harder the more you pick, and one left to over-mature tells the plant its job is done. The part you're after: tubers (cooked).
Making more for free
Every seed we sell is open-pollinated, which means you can save your own from the best plants and it'll grow true next year. Let a few of your strongest plants finish and go to seed, dry it fully, and store it cool and dark. That's the whole point of heirlooms — buy once, grow forever.
Keep this knowledge offline
A garden full of true yam is a real asset when times get hard — but the know-how to grow, store, and use it shouldn't live only on a website you can't reach. That's why I keep a copy of the references I rely on on a local server at home. Project NOMAD is a free, open-source way to run Wikipedia, survival and medical guides, maps, and even a private AI on your own hardware — knowledge that keeps working with no internet, no cloud, no signal.
See how I keep my library offline →Part of the free Texas Roots plant database, compiled by Jordan Polasek from his greenhouse in El Campo, Texas. Free to read and share. If it helped, the best thanks is to grow something.