How to grow egusi melon

In the two weeks before you sow, choose your seed from big, healthy, fully-ripe fruit of a good local type — dark-margined seed for the common egusi, or plump white seed for the white-seed type. Keep only fat, well-filled seed and throw out thin, cracked or discoloured seed, which comes up weak and patchy.

Pick a free-draining field — gently sloping or sandy-loam ground where water never stands after rain. Egusi hates wet feet: soggy ground rots the seed and the young roots. Avoid low patches that hold water.

Plan the layout. Egusi is grown as a ground cover, so mark where the vines will run between your yam mounds, cassava or maize, or across its own field. Space the sowing hills about a pace and a half apart (≈1.5 m) each way, so the vines have room to spread and knit into a mat.

Plan a rotation: do not plant egusi where melon, cucumber, pumpkin, gourd or watermelon grew last year. These cousins share the same mildews, wilt and root pests, which build up in the soil — moving to fresh ground leaves them behind.

Remember egusi is a light feeder — it needs little or no fertiliser and often lives on the fertility and manure you already gave the main crop it runs beneath. If your soil is very poor, a little well-rotted manure worked in before sowing is plenty.

Sow when the soil is moist — on a good planting rain, or where you can keep the hills watered. Egusi needs damp (not wet) soil to sprout evenly.

At each station — about a pace and a half apart (≈1.5 m) each way — make a hill and drop 2–3 seeds together, about one finger-joint deep (a few centimetres). Cover them lightly and press the soil down so the seed sits snug against moist earth.

Keep the soil just moist until the seedlings push through — usually 5–10 days after sowing. Do not let it dry out, but do not flood it either.

Once the seedlings open their first proper leaves, thin each hill to the strongest 1–2 plants: pinch or cut the weaker ones off at ground level rather than pulling them, so you do not disturb the roots of the one you keep.

Do all of this within about two weeks of sowing — an early, even thinning gives each vine room to run and knit into the ground-cover mat.

From about 5 days after sowing, walk the hills every 3–4 days for the first three weeks — right through emergence and thinning.

Turn over a few young leaves and look for beetles: small yellow-and-black striped or spotted beetles that chew the leaves into a lacy skeleton, leaving only the veins. A few are fine; heavy feeding on tiny seedlings is not.

Look for seedlings that have suddenly flopped over, with a pinched, dark, water-soaked stem right at the soil line — that is damping-off, a rot of wet, airless soil. Pull and discard the collapsed seedlings and ease off the watering.

Check for seedlings cut clean off at ground level (worst overnight) — scratch the soil nearby for a fat, curled caterpillar (a cutworm) — and re-sow any stations you lose while the soil is still moist.

If beetles are heavy, hand-pick them in the cool of the morning when they are slow, or spot-treat only the worst hills. Do not blanket-spray tiny seedlings when a few beetles are all you see.

Weed about 3–5 weeks after sowing (roughly 20–35 days), while the vines are still short and you can walk between the hills.

Hoe or pull the weeds out shallowly near the plants — egusi's roots run wide and near the surface, so deep chopping close to the crown cuts them.

Get the field clean before the vines close over. Once the mat knits shut you cannot weed inside it — and you will not need to, because little light reaches the ground.

In dry spots, leave the pulled weeds lying between the hills as a mulch to hold moisture while the vines spread.

From about 3 weeks after sowing until around 7 weeks (20–50 days), walk the crop about once a week and turn some leaves over.

Downy mildew: on the upper side look for angular yellow patches boxed in by the leaf veins; in damp weather a grey-purple fuzz shows on the underside. It spreads fast in wet, humid spells.

Powdery mildew: look for white powdery patches, like flour dusted on the leaves and stems, that spread and turn the leaves yellow and brittle.

Aphids: turn over young leaves and shoot tips and look for clusters of tiny soft green or black insects, often with sticky, shiny leaves and ants running about.

Mosaic virus: look for leaves mottled light-and-dark green, puckered or distorted, on stunted plants. It is carried by aphids — pull out and remove (rogue) badly affected plants so they do not seed the rest.

Note what you see and where. Keep the vines on free-draining ground and avoid wetting the leaves late in the day — most mildews thrive on leaves that stay wet overnight.

Once the first flowers open, treat the field as bee territory for the whole flowering month (about 30 days).

Learn the two flowers: male flowers sit on a thin plain stalk and open first; female flowers have a tiny round baby-fruit (a little swelling) just behind the petals. Only the female ones become fruit, and only if a bee brings them pollen.

Do not spray insecticide on open flowers. If a pest truly forces your hand, spray only in the late afternoon or evening, once the flowers have closed and the bees have gone home — never on the open blooms.

Leave a few flowering weeds or hedgerow plants nearby if you can: more bees around the field means better fruit set.

If you see plenty of flowers but little fruit setting, poor pollination is the likely cause — protect the bees and stop spraying rather than reaching for more chemicals.

From the first open flower onward, do not let the crop dry out. If the rain is short and you can water, do it every 5–7 days.

Aim for steady, even moisture — neither bone-dry nor waterlogged. Swings between drought and flood shed flowers and fruit.

Check with a finger: if the soil is dry a finger-joint down, water. Egusi's roots run deep, so water enough to wet the root zone, not just dampen the surface.

Water in the cool of the morning or evening so less is lost to the sun, and keep the water off the open flowers where you can.

From about 7 weeks after sowing right through to harvest (50–120 days), walk the crop about once a week, lifting leaves to see the fruit beneath the mat.

Look for fruit with soft, sunken, mouldy patches, especially where it sits on wet soil — that is fruit rot. Remove and discard rotting fruit so it does not spoil the sound fruit touching it.

Look for fruit with tiny sting punctures that ooze and weep, or that rot and drop early with maggots inside — that is fruit fly. Pick and destroy infested fruit (bury it deep or burn it) to break the fly's breeding, rather than leaving it in the field.

Slip a flat stone, dry grass or a few leaves under ripening fruit on wet ground so it sits dry and rots less.

As maturity nears, ease off the watering so the fruit and seed can dry down — see 'Ease water late'.

In the last few weeks before harvest (about 100–120 days after sowing), start cutting back the water.

Once the fruit have stopped growing and the leaves begin to yellow and die back, stop watering altogether and let the crop dry in the field.

Let a dry, warm spell finish the ripening — the drier the fruit comes off the vine, the less rot and mould you fight when you extract the seed.

Heap the ripe fruit in a pile (in the shade is fine) and leave it about 1–2 weeks so the flesh softens and rots off the seed. The heap will smell — that is normal fermentation doing the work of freeing the seed.

When the fruit are soft, break them open and scoop the pulpy seed mass into a tub of water.

Rub and float: work the mass between your hands and swirl it. Good, heavy seed sinks, while pulp, skins and empty seed float — skim the floaters off. Pour off the dirty water and rinse with clean water until the seed is clean.

Spread the seed thinly on a clean, raised surface — a mat, rack or tarpaulin, never bare ground, which pushes damp back in and adds mould, grit and animal dirt. Dry it in the sun, turning it so it dries evenly.

Dry until the seed is hard and snaps rather than bends — this is the test that matters. Shell or de-coat the seed if your market wants it that way.

Store the hard-dry seed in a cool, dry, airtight container, off the floor and away from damp walls, and check it now and then for any musty or mouldy smell.

Before you store, test each batch: bend and press a seed. Hard and snaps → it is dry enough, store it. If it still bends or dents → it is too wet: spread it back out and dry it more before storing, or the whole lot can mould and turn poisonous.