Last updated on October 31st, 2026 at 10:50 am
Knowing when cassava is ready to harvest saves a farm from two costly mistakes: digging small roots too soon, or waiting until they turn woody. On our plots in Ntigha, the plant itself shows clearly when that moment has arrived.
My mother has farmed cassava for decades, and she almost always knows when a farm is due.
She does not guess, because she counts the months from the day she planted to the usual harvest time.
We still confirm that count in the field by looking at the stems, mounds, and leaves, then digging around the base.
Our roots are usually ready from about eight months, though they can stay in the ground for over a year.
This post covers each sign we check, what research says about timing, and what happens to roots left too long.
Table of Contents
Count the Months First
Counting from planting day is the simplest check, and it is the one my mother has relied on for decades.
On our farms, roots are ready from about eight months, and we harvest in batches rather than all at once.
IITA’s commercial cassava guide advises harvesting early maturing varieties at 9 to 12 months, and full season varieties at 12 to 18 months.
The guide adds that the best timing varies with variety, climate, and soil, so a calendar alone is never the whole answer.
I see no difference in readiness between the improved and local varieties growing side by side on my plots.
How the crop develops from sprouting to bulking is traced in cassava growth stages.
Signs Cassava Is Ready to Harvest
| Sign | What we look for |
|---|---|
| Stems | Big, thick stems on every plant |
| Mounds | Cracks running through the soil of the mound |
| Roots | In some plots, root tops showing at the surface |
| Leaves | Yellowing leaves, or leaves that are no longer fresh |
| Whole plant | A tired, unfresh look across the plot |
The stems are the first thing we check, since a ready plant has grown stems that are big enough.
Cracks then open in the mounds as the swelling roots push against the soil around them.
In some plots, the tops of the roots show through the cracked soil, which leaves very little doubt.
The leaves turn yellow or simply stop looking fresh, and the whole plant takes on a tired appearance.
No single sign settles the question, so we look for several together before planning any harvest.
Test by Digging Around the Base
Before harvesting a whole plot, we dig the soil around the base of a plant to check root size.
That small dig reveals how thick and mature the roots are without pulling up the entire plant.
Buyers of standing farms do something similar, digging one or two plants to judge the yield before agreeing a price.
Once the roots look right, digging methods are covered in how to harvest cassava roots.
What Research Says About Timing
An IITA trial in Oyo State found yields and starch rose as harvest moved from 9 to 11 to 13 months.
The largest jump came between the 9 and 11 month harvests in that study.
Mosaic-resistant improved lines reach their peak yields at 12 to 15 months, according to IITA’s PROPAS page.
Digging at eight months can mean smaller roots than waiting longer, so timing depends on what the household or buyer needs.
The planting date that sets this whole calendar is discussed in best time to plant cassava.
What Happens When Roots Stay Too Long
On our farms, roots left too long in the ground become woody and bitter.
Where the land is cold or gets limited sunlight, overdue roots also rot in the soil.
IITA’s guide agrees that delayed harvesting may cause roots to become fibrous or to rot.
In cold areas such as the Jos Plateau, the same guide says harvesting can wait until 18 to 24 months.
We still leave roots in the ground past a year when there is no processing need, though never indefinitely.
Threats that build up in older plantings are covered in cassava pests and diseases.
After the Roots Come Out
Once cassava is ready to harvest and the roots are out, the clock starts, because fresh roots spoil within days.
FAO guidance on starch extraction says roots should be processed within two days of harvest.
In my community, roots left until the fourth day after harvest give the garri made from them a bitter, strange taste.
That is why we dig only what we can process, as described in post-harvest handling of cassava.
One full harvest from my own farm in Ntigha is recorded in the diary post I harvested my cassava.
Conclusion
Cassava is ready to harvest when the stems are big, the mounds crack, and the leaves yellow or lose their freshness.
Counting months from planting gives the first clue, and a dig around the base confirms root size.
IITA places early varieties at 9 to 12 months, while our roots are usually ready from eight.
Roots left too long turn woody and bitter, and they rot on cold or shaded land.
Questions about harvest timing on your own farm are welcome through Cassava Pathway on WhatsApp.
Frequently Asked Questions
How many months does cassava take to mature?
On our farms, roots are usually ready from about eight months after planting.
IITA advises 9 to 12 months for early types and 12 to 18 for others.
How do I know when cassava is ready?
Look for big stems, cracked mounds, and yellowing or tired leaves across the plot.
Then dig carefully around the base of one plant to check root size.
What happens if cassava is harvested late?
Roots left too long become woody and bitter, and can rot on cold land.
IITA’s commercial guide also warns that delayed harvesting can make roots fibrous or rotten.
Does the variety change harvest timing?
IITA says the right timing varies with variety, climate, and soil conditions.
On my farm, TME 419, TMS lines, and local types seem to mature at the same pace.
Chimeremeze Emeh is a tropical crop farmer and chemical engineer from Ntigha, Isiala Ngwa North LGA, Abia State, Eastern Nigeria, specializing in cassava and palm oil, with over 30 years of hands-on experience growing, harvesting, and processing cassava. He grows TMS series, TME 419, and local traditional varieties on his own farms and operates a small-scale cassava flour and starch production business through Cassava Pathway, which he founded as a CAMA-registered agribusiness in 2024. He is also the founder of Palm Oil Pathway, where he applies the same tropical farming expertise. His farms are located in Ntigha, Abia State.