Cassava grows from a woody stem cutting, not a seed, pushed into warm soil at a slant a few inches deep, spaced about 3 feet apart, once the soil has warmed past 65°F with no frost anywhere in the forecast. From there it needs a long frost-free stretch, 8 to 12 months depending on the variety, before you dig the roots. That is the short version of how to grow cassava, but the honest version has a few traps that catch first-timers every single year.
The biggest one is planting the cutting upside down or sideways without knowing which end is which. It looks fine at first. It rots at the base and never sprouts, and you will not know for weeks.
There is also the sign everyone misreads at harvest time: cassava leaves yellow and drop late in the season, and new growers panic and dig early, months before the roots are actually worth eating. And there is the question you are about to ask right after this one: can you even eat it raw or straight out of the ground. The answer is no, and it matters. Stick with me through the sections below and I will get you to the save-able Cassava at a Glance card at the bottom, the one worth screenshotting before you go outside.
When to Plant Cassava
Cassava is a tropical plant with zero frost tolerance, so timing starts and ends with soil warmth. Wait until soil temperature holds above 65°F and nighttime lows stay reliably above 60°F, which usually lands two to four weeks after your last frost date.
In USDA zones 9 and 10, that means late spring. In zone 11 and warmer, you can plant nearly any time the ground is not soggy from a rainy stretch. Anywhere colder than zone 9, cassava has to be grown as a container plant you bring in for winter, because it cannot finish its 8 to 12 month cycle before frost shuts it down.
Planting into cold or wet soil is the single most common way to lose cuttings before they ever sprout.
Choosing the Spot and Prepping the Soil
Cassava wants full sun, at least 6 to 8 hours a day, and it wants room. Mature plants reach 5 to 9 feet tall with a spreading canopy, so give it space where it will not shade out shorter crops.
Soil drainage matters more than fertility. Cassava tolerates poor, sandy, even mildly acidic soil, but it will not tolerate wet feet. Heavy clay that holds water is the fastest way to rot a planting before it starts.
If your soil is heavy, build a raised mound or ridge 8 to 12 inches tall and plant into that instead of fighting the native ground. Work in a couple inches of compost, but skip heavy nitrogen fertilizer at planting, since it pushes leafy growth at the expense of the roots you actually want.
Once the bed is ready, the planting technique itself is where most of the real mistakes happen.
Planting Cassava Step by Step
Cassava is grown from stem cuttings, sometimes called stakes, cut from a mature, woody plant that is at least 8 to 10 months old. A good cutting is 8 to 12 inches long and about as thick as your thumb, with several visible nodes.
1. Choose and cut the stake
Cut from the middle to lower portion of a mature stem, not the soft green tip. Make a clean angled cut at both ends with a sharp, sanitized knife or pruners.
2. Get the orientation right
This is the step everyone gets wrong. Cassava stems have a natural direction of growth, and nodes point slightly upward toward where the leaf once grew.
Plant the end that was closer to the base of the parent plant down, and the end closer to the growing tip up. If you cannot tell, lay the stake flat in a shallow trench instead of standing it upright, buds pointing up. Flat planting is more forgiving and still sprouts reliably.
3. Set the depth and spacing
Push or lay the stake so two-thirds of it is buried, leaving the top third with a node or two above the soil line. Space plants 2.5 to 3 feet apart in rows 3 to 4 feet apart, since the canopy fills in wider than it looks at planting time.
4. Water it in once
Give it a good soak at planting, then back off. Overwatering a fresh cutting before roots form is worse than underwatering it.
Sprouting takes 1 to 3 weeks in warm soil, and that first flush of leaves tells you whether the orientation guess paid off.
Watering and Feeding Through the Season
Cassava is genuinely drought-tolerant once established, which surprises people who baby it like a vegetable garden crop. Established plants need watering only during extended dry spells, roughly once every 7 to 10 days with no rain, and even then it prefers to dry out between waterings rather than stay damp.
New plantings are the exception. Keep the top few inches of soil lightly moist for the first 4 to 6 weeks while roots establish, checking by feel an inch down rather than by the calendar.
Skip heavy nitrogen feeding all season. A light application of a balanced, low-nitrogen fertilizer or a side-dressing of compost at 2 and 4 months is plenty. Too much nitrogen grows a jungle of leaves and small, disappointing roots underneath.
Feed lightly, water sparingly, and the plant does most of the rest of the work itself.
Problems That Actually Show Up
Cassava is tougher than most root crops, but a few issues are common enough to plan for.
- Root rot: from soil that stays wet too long. The fix is drainage, not more attention, raise the bed if this happens twice.
- Cassava mosaic virus and mealybugs: mottled, distorted leaves usually mean a viral or pest issue spread by insects. Remove and destroy affected plants rather than trying to nurse them, and always start new plantings from healthy-looking stock.
- Spider mites: fine webbing and stippled, pale leaves in hot, dry weather. A strong hose spray and improved humidity around the plant usually knock them back; for a bad infestation, follow the label on an insecticidal soap or miticide.
- Slow or no sprouting: almost always cold soil, a rotted cutting, or a cutting planted upside down.
None of these are usually fatal to the whole planting if you catch them early, which brings us to the part everyone is really here for.
When and How to Harvest Cassava
Here is the yellowing-leaves myth cleared up: late-season leaf yellowing and drop is normal, not a distress signal, and it is not your cue to dig. Cassava roots keep bulking up for months after the plant looks tired above ground.
Roots are ready anywhere from 8 to 12 months after planting, depending on variety and climate, with warmer, longer growing regions landing on the shorter end. There is no single visual cue that shouts “ready” the way a ripe tomato does, so most growers go by the calendar plus a test dig, gently excavating around one plant to check root size before committing to the whole row.
Roots do not store well in the ground or out of it. Once mature, they start to fibrous up and degrade within a week or two if left in warm soil, and after harvest they spoil within a couple days unmarked, so dig only what you plan to use or process soon, and never all at once unless you have a plan for it.
To harvest, loosen soil around the plant with a fork well outside the root zone, then lift the whole plant by the base of the stem, easing the roots free rather than yanking.
Now for the part that actually matters more than timing: what you do with cassava once it is out of the ground.
The Part No One Skips: Cassava Is Not Safe Raw
Raw cassava, especially the peel and bitter varieties, contains compounds that release cyanide when the plant tissue is damaged, and it is toxic to people and pets if eaten raw or improperly prepared. This is not a rare-variety footnote, it applies broadly enough that you should treat every homegrown root as needing full preparation.
Peel it, then cook it thoroughly, boiling, baking, or frying, until fully soft, never eaten raw or undercooked. If a pet or a person eats raw cassava root, peel, or leaves, contact a veterinarian or poison control and a doctor right away rather than waiting to see what happens.
That single rule, peel and cook everything, fully, every time, is worth remembering more than any planting date on this page.
Cassava at a Glance
- When to plant: once soil holds above 65°F and all frost risk has passed, typically two to four weeks after your last frost date, zones 9 to 11 outdoors.
- Depth and spacing: bury two-thirds of an 8 to 12 inch stem cutting, space plants 2.5 to 3 feet apart in rows 3 to 4 feet apart.
- Sun and soil: full sun, 6 to 8 hours minimum, well-drained soil, mound or raise the bed if your ground stays wet.
- Watering: keep new plantings lightly moist for 4 to 6 weeks, then water established plants only during extended dry spells.
- Feeding: light, low-nitrogen fertilizer or compost at 2 and 4 months, skip heavy nitrogen all season.
- Harvest window: 8 to 12 months after planting, confirm with a test dig, harvest only what you will use since roots spoil within days.
- Before eating: peel and cook thoroughly every time, never raw, contact a veterinarian or doctor immediately for any suspected raw ingestion.
Get the cutting orientation and the soil drainage right, and cassava mostly grows itself for the better part of a year.
The only date that truly matters is the one after harvest, when it hits the cutting board and the stove.
