Fertilising guide
How to fertilise teff grass (Eragrostis tef)— schedule & NPK
Also called teff grass, teff, Williams lovegrass, annual teff.
More about teff grass
About teff grass
Eragrostis tef · also called teff grass, teff · edible
Teff is a warm-season annual cereal grass originating in Ethiopia and Eritrea, where its tiny nutritious grains are the primary ingredient of injera flatbread. The smallest cereal grain in the world, teff is gluten-free, rich in calcium, magnesium, iron, and dietary fibre. Grown as an edible grain crop, hay, or cover crop and harvested within 45–90 days of sowing.
Growth habit: Upright, tufted annual grass reaching 60–90 cm tall with fine, narrow leaf blades and open, multi-branched panicles bearing thousands of tiny seeds on fine, hair-like branches. Stems are slender and may lodge (fall over) in heavy rain or wind if over-fertilised or over-irrigated. Completes its life cycle from seed to harvest in 45–90 days.
Watch for — Lodging in wet or high-fertility conditions: Excess nitrogen or irrigation causes teff stems to become top-heavy and fall over (lodge), making harvest difficult and reducing yield. Use moderate fertility, do not over-irrigate, and harvest hay before stems become too tall and heavy. Choose lodging-resistant varieties where available.
What fertiliser teff grass actually wants — and why
teff grass feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.
Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for teff grass: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed teff grass, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For teff grass:
Apply a balanced fertiliser (NPK 10-10-10 or similar) at seedbed preparation. For hay production, a modest nitrogen application (25–50 kg N/ha) after first cutting encourages rapid regrowth for a second cut. Avoid excess nitrogen, which promotes lush vegetative growth at the expense of grain production and increases lodging risk. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).
The dormant-season rule matters more than the exact interval: skip feeding entirely when teff grass is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for teff grass
Follow the crop-feed label rate for teff grass — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.
Feeding always goes onto already-damp soil, never dry roots — water teff grass first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the teff grass watering schedule.
Signs you are over-feeding teff grass
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for teff grass:
- Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen).
- Lush foliage hiding the crop; soft growth prone to pests and disease.
- Salt crust on the soil and scorched leaf edges in containers.
Signs you are under-feeding teff grass
- Pale, yellowing lower leaves and stunted growth.
- Small fruit, poor set, and a quickly exhausted plant.
- Blossom-end rot and weak cropping from erratic or insufficient feeding.
If the symptoms point at watering, light or roots rather than nutrition, the full teff grass care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
In containers, fertiliser salts build up fast — water teff grass thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.
Organic vs synthetic feeds for teff grass
Organic options
Garden compost or well-rotted manure dug in before planting, plus a liquid comfrey or seaweed feed once fruiting starts. UK: comfrey feed or organic Tomorite; US: Espoma Tomato-tone or Neptune's Harvest. Builds soil and feeds in one.
Synthetic / liquid feeds
A balanced feed at planting then a high-potash tomato feed in fruiting — UK: Growmore at planting then Tomorite (Levington) or Phostrogen; US: a balanced 10-10-10 then Miracle-Gro Tomato or a bloom booster.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising teff grass — frequently asked questions
What fertiliser does teff grass need?
Balanced (even N-P-K) at planting for roots and frame, then switch to a high-potassium ("high-potash") tomato-style feed once the first flowers open — potassium is what sizes and ripens fruit, not nitrogen. teff grass feeds in two distinct phases — balanced to build the plant, then high-potassium the moment flowering starts to set and fill a heavy crop.
How often should I feed teff grass?
Apply a balanced fertiliser (NPK 10-10-10 or similar) at seedbed preparation. For hay production, a modest nitrogen application (25–50 kg N/ha) after first cutting encourages rapid regrowth for a second cut. Avoid excess nitrogen, which promotes lush vegetative growth at the expense of grain production and increases lodging risk. Apply a balanced fertiliser (NPK 10-10-10 or similar) at seedbed preparation. For hay production, a modest nitrogen application (25–50 kg N/ha) after first cutting encourages rapid regrowth for a second cut. Avoid excess nitrogen, which promotes lush vegetative growth at the expense of grain production and increases lodging risk. So: a balanced feed or compost at planting, then a high-potash liquid every 1-2 weeks from first flower through harvest across the main season (spring through early autumn).
What strength of feed for teff grass?
Follow the crop-feed label rate for teff grass — these are calibrated for hungry vegetables. Consistency through fruiting matters more than strength; erratic feeding causes problems like blossom-end rot.
What does over-feeding teff grass look like?
Vigorous dark-green leafy growth but few flowers or fruit (excess nitrogen). Lush foliage hiding the crop; soft growth prone to pests and disease. Salt crust on the soil and scorched leaf edges in containers. Staying on a high-nitrogen feed once teff grass starts flowering is the classic error — you get a huge leafy plant and a disappointing crop. Switch to high-potash the moment flowers appear.
Should I flush the soil of teff grass?
In containers, fertiliser salts build up fast — water teff grass thoroughly so excess drains from the base each time, and flush pots with plain water every few weeks to prevent a damaging salt build-up.
Keep reading
- teff grass care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water teff grass — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise lemon tree 'meyer'
- How to fertilise lime tree
- How to fertilise kumquat
- All 8452 fertilising guides in the Growli library