Tomato
Also called: طماطم · بندورة · Tamatim
Start seed in trays under shade in late August and transplant as Al-Wasm opens in mid-October. Planting after November means a thin harvest before the April heat kills the plant.
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
Sow in trays indoors or under 50% shade. Tomato seed germinates badly above 35 °C, which is an ordinary September soil temperature here.
Germination
Days 6–10The 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
Germination is faster here than the packet says — expect six days, not ten. Do not overwater assuming it has failed.
Seedling
Days 11–30The 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
Harden off over a full week before transplanting. A seedling raised soft under shade will burn in a single exposed day.
Vegetative growth
Days 31–54The plant is building its frame — stem, leaves, branches. Every leaf added now means more fruit later, because leaves are the sugar factory.
Do now
- Stake the plant now while it is small — staking late damages the roots.
- Feed with a nitrogen-rich fertiliser every two weeks to push leafy growth.
- 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
- Lush leaves but no flowers: too much nitrogen. Stop the nitrogen feed.
- Midday wilting even though the soil is moist: heat stress — the plant needs shade.
In Qatar
Bury the stem up to the first leaves when transplanting. Tomato roots from buried stem, and that extra root system is what carries it through hot sandy soil.
Flowering
Days 55–69The plant switches from building a body to making offspring. Flowers open, and every one that is successfully pollinated becomes a fruit.
Do now
- 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.
- Shake the plant gently in the morning, or use a small brush, to help pollination if bees are scarce.
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
Flowering in November–January means you timed it right. Flowering in March means heat-driven flower drop.
Fruit set
Days 70–84The 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
Brackish well water blocks calcium uptake. If yours is salty, add calcium nitrate weekly through this stage specifically.
Ripening
Days 85–99The 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
Ripening slows in December–January because of the cold nights. That is normal and gives better flavour — do not water more to hurry it.
Harvest
Days 100–150The 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
Picking runs December to April. Birds — bulbuls especially — peck ripe fruit; use light netting, not chemicals.
End of cycle
Days 151–180Production 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
Once April brings 35 °C the plant stops setting fruit no matter what you do. Pull it and prepare the soil for summer.
- Water
- High
- Salt tolerance
- Medium
- Heat tolerance
- Medium
14 L/week in winter, 28 L in summer
Soil preparation
Work 5 kg of well-rotted manure per square metre into the sand, and add agricultural gypsum if the soil is strongly alkaline. Tomato needs at least 30 cm of improved soil.
Pests
Whitefly
- Sign
- A cloud of tiny white insects when you shake the plant, and sticky leaves turning black.
- What to do
- Spray potassium soap or neem oil on the leaf undersides at dusk, and hang yellow sticky traps.
Tomato leafminer (Tuta absoluta)
- Sign
- Winding transparent tunnels inside the leaf, and holes in the fruit with black frass.
- What to do
- Strip and burn affected leaves at once, and use pheromone traps. This is the most serious tomato pest in the Gulf.
Spider mite
- Sign
- Faint speckling on the leaves and very fine webbing, worse in hot dry air.
- What to do
- Raise humidity by misting the foliage in the morning, and spray neem oil every five days, three times.
Common problems
Blossom-end rot
- Cause
- Calcium not reaching the fruit. In Qatar the cause is nearly always irregular watering or salty water, not a lack of calcium in the soil.
- Fix
- Make the watering schedule rigid, fit drippers and mulch. Affected fruit will not recover, but the next ones will be fine.
Flower drop
- Cause
- Days above 35 °C or nights above 24 °C make the pollen sterile. This is why late plantings fail in Qatar.
- Fix
- Fit 30% shade netting from March and mist the foliage late afternoon to drop the temperature. The real fix is to plant earlier.
Fruit cracking
- Cause
- A heavy watering after a dry spell: the inside of the fruit expands faster than the skin.
- Fix
- Water smaller amounts more often instead of one big soak.
Picking
Pick when the colour has turned right through and the fruit gives slightly under pressure. Picking at first blush lets it finish indoors — slightly less flavour, but safe from birds.
Keeping
Never refrigerate tomatoes — cold destroys the flavour. Keep them shaded at room temperature for up to a week.