Bitter gourd
Also called: قرع مر · كاريلا · Karela · Bitter melon
One of the rare gourds that likes warmth, sown from late February and picked from April to July. A staple of Indian and Pakistani cooking, with a large following in Qatar. This window is less certain than most, so check it.
The year at a glance
Each month is split in half. The outline marks now.
Stage by stage
Stage 1 of 9
Seed
Days 0–5
Seed
Days 0–5The seed sits in the soil taking up water and swelling. Nothing shows above the surface — everything is happening underground.
Do now
- Water lightly and often so the soil stays damp but never soaked. Letting it dry out between waterings kills the seed before it sprouts.
- Cover the surface with a thin layer of straw or compost to slow evaporation and steady the temperature.
- Label what you sowed and when. You will need the date to work out the harvest.
Watch for
- A hard crust forming on sandy soil after watering, which traps the sprout underneath. Break it gently.
- Ants carrying small seeds away — a very common problem in Qatari gardens.
In Qatar
The seed coat is very hard, so nick it lightly or soak it 24 hours. Sow from late February, once the soil is above 22 °C.
Germination
Days 6–12The seed coat splits: a root pushes down and a shoot pushes up. The two seed leaves that appear are not true leaves — they are the seed’s own food store.
Do now
- Keep moisture constant. The first root is very fine and a single dry day can end the seedling.
- Remove any covering as soon as the first sprout shows, or it will stretch thin looking for light.
- Give bright, indirect light. Direct midday sun will scorch a new seedling within hours.
Watch for
- A long, thin, pale stem: the seedling is not getting enough light and will collapse.
- Sudden wilting with a pinched stem at soil level — damping off, caused by overwatering.
In Qatar
Slow: ten days is entirely normal. Do not resow before day 15.
Seedling
Days 13–24The first true leaves appear, shaped differently from the seed leaves. The plant is now feeding itself and the roots are branching fast.
Do now
- Thin crowded seedlings and keep the strongest. Crowding gives you many weak plants instead of one good one.
- Start watering less often but more deeply, to drive the roots downwards.
- Harden the seedling off — build up its sun exposure over a week before transplanting.
Watch for
- Yellowing lower leaves: nitrogen shortage, very common in Qatar’s poor sandy soil.
- Small holes or chewed edges, meaning snails or young grasshoppers.
In Qatar
Put the trellis up early. The tendrils are fine and twist quickly round any wire or string.
Vegetative growth
Days 25–39The trailing stems run fast and tendrils appear. The plant is hunting for something to climb, and training it now decides the shape of the whole crop.
Do now
- Put the trellis up now and train the stems onto it. Getting the vine off the ground cuts disease and pests dramatically.
- Tie the stems with soft, wide strips of cloth rather than thin twine that cuts in.
- Water deeply in the early morning. Evening watering plus high humidity invites fungal disease.
- Check the undersides of leaves weekly for whitefly and aphids.
Watch for
- Stems trailing on hot ground and scorching underneath.
- Lush leaves but no flowers: too much nitrogen. Stop the nitrogen feed.
In Qatar
It takes Qatar’s heat better than any other gourd in this guide. Mulch the roots with straw to keep them cool.
Flowering
Days 40–49Male flowers open first, then female ones with a miniature fruit already behind them. Only the female flowers bear, and pollen has to reach them.
Do now
- If nothing is setting, hand-pollinate: pick a male flower and dab it into the centre of a female one in the morning.
- Cut back nitrogen and raise potassium and phosphorus to support fruit set.
- Never let the soil dry out completely between waterings. Drought now makes the flowers drop.
Watch for
- Flowers dropping without setting fruit: above about 35 °C the pollen goes sterile. Get shade over it now.
- No pollinating insects at all — common on enclosed roofs and balconies.
In Qatar
Male and female flowers are separate. In an enclosed garden, hand-pollinate in the morning with a male flower.
Fruit set
Days 50–58The petals wither and the ovary behind them swells. Small, hard green fruits appear and grow day by day.
Do now
- Make watering perfectly regular. Swinging between dry and drenched causes most fruit cracking and rot.
- Support the fruiting branches before the weight breaks them.
- Add calcium if your irrigation water is brackish, to head off blossom-end rot.
Watch for
- A sunken brown patch at the base of the fruit: calcium shortage from irregular watering or salinity.
- Small fruits yellowing and dropping: the plant is carrying more than it can feed, or it is thirsty.
In Qatar
Bag each fruit in paper while finger-sized. Fruit fly is the pest that decides whether the season succeeds.
Ripening
Days 59–64The fruit stops growing and starts changing colour, turning its starch into sugar. Heat speeds this stage up.
Do now
- Ease off the water slightly to concentrate the flavour — but never to the point of wilting.
- Shade exposed fruit with the plant’s own leaves to prevent sunscald.
- Pick as things ripen. Leaving fruit on the plant stops it setting new ones.
Watch for
- White or leathery brown patches on the sun-facing side: sunscald.
- A small hole with rot inside, meaning fruit worm.
In Qatar
It is eaten green and immature. Watch the tip of the fruit: once it yellows, it is past its best.
Harvest
Days 65–130The fruit is ready. The plant is at peak production and will keep bearing as long as you keep picking and the weather holds.
Do now
- Pick in the early morning when the fruit is full of water and will keep longest.
- Use scissors rather than pulling by hand, so you do not tear the branch.
- Keep feeding potassium every two weeks to stretch the picking season out.
Watch for
- New fruit coming smaller: the plant is exhausted and needs feeding.
- The seasonal heat rising, which will shut production down within weeks.
In Qatar
Pick every three days from April to July. A fruit left to turn orange tells the plant to stop setting more.
End of cycle
Days 131–160Production tails off and the leaves yellow. As the heat builds the plant stops setting fruit altogether.
Do now
- Bring in the last of the fruit, even the ones not fully ripe.
- Save seed from the best fruit on the strongest plant if you want to grow it again.
- Pull the plant and compost the healthy remains; bin or burn anything diseased.
- Work compost into the soil now, ready for the next Al-Wasm.
Watch for
- Leaving diseased plants in the ground carries pests over to next season’s crop.
- Bare soil under the sun goes dead. Cover it or sow a green manure.
In Qatar
It slows in peak summer but can survive in shade and fruit again in autumn. Leave one fruit to ripen for next year’s seed.
- Water
- Medium
- Salt tolerance
- Medium
- Heat tolerance
- High
8 L/week in winter, 22 L in summer
Soil preparation
It handles Qatar’s soil better than most gourds once compost is added. Dig a 30 × 30 cm hole filled half with compost, and mulch thickly so the roots stay cool.
Pests
Fruit fly
- Sign
- Small punctures and internal rot in young fruit, and the fruit dropping. The most serious pest of this crop in the Gulf.
- What to do
- Bag each fruit in paper while it is finger-sized, and hang pheromone traps around the edge.
Whitefly
- Sign
- A white cloud when you shake the plant, and sticky leaves turning black.
- What to do
- Neem oil under the leaves at dusk, and yellow sticky traps.
Common problems
Orange, splitting fruit
- Cause
- Leaving the fruit to ripen. It turns orange, splits and shows red seeds, and the plant slows its production.
- Fix
- Pick while green and glossy, before the tip yellows, and leave just one for seed.
Flowers but no fruit
- Cause
- Separate male and female flowers, and no pollinators in walled gardens.
- Fix
- Hand-pollinate in the morning with a male flower. Female flowers are the ones with a tiny fruit behind them.
Picking
Pick the fruit green and glossy at 15–20 cm, before the tip yellows. Picking every three days stretches production by weeks.
Keeping
Five days in the fridge. Salt and squeeze it before cooking to soften the bitterness, or sun-dry slices as in Indian cooking.