Lemon Plant in a Pot (Nimbu Ka Paudha): Yellow Leaves, No Fruit
That lemon seed sprouting on your windowsill might give you lemons in five or more years, or it might give you a thorny bush and nothing else. If you want to know how to grow lemon plant at home in a pot and actually pick fruit, buy a grafted plant from a nursery, give it a big pot that drains, 6 or more hours of sun, and water it deeply but not daily. The rest of this guide explains yellow leaves, falling flowers, and the green caterpillar that looks like bird droppings.
The short version
- Buy: a grafted kagzi or seedless lemon, 2 to 3 years old.
- Pot: start at 35 to 40 cm wide; final pot about 45 to 50 cm.
- Sun: 6 to 8 hours; protect the pot itself from 45°C heat.
- Water: deeply, when the top 5 cm of soil is dry.
- Normal: most flowers and many tiny fruits drop. It’s the tree thinning itself.
- Main pests: leaf miner and the citrus caterpillar, both handled without sprays.
Prefer to listen? This post as a 5 min video · Video page with transcript
How to grow lemon plant from seed, and why a grafted plant is better
You can grow lemon from seed, and it’s a fun experiment with children. Wash the seed from a fresh lemon, plant it 1 cm deep in damp mix, keep it warm, and it’ll usually sprout in 2 to 4 weeks. The trouble starts afterwards.
A seed-grown lemon spends its first years just being a tree. It’s usually thornier and more upright, and it can take five years or more to flower, sometimes much longer in a pot. Many citrus seeds do grow into close copies of the parent, which is a genuinely odd trait of the family, but not all, and a shop lemon may be a hybrid. You won’t know what you’ve got until it fruits.
A grafted plant skips all that. Nurseries join a branch from a proven fruiting lemon onto a tough rootstock, often the rough lemon called jatti khatti in Pakistan. It fruits within a year or two, stays smaller, and gives the exact lemon you chose. For a pot, that’s the honest answer: buy grafted.
Which lemon for a pot?
The small, thin-skinned, very sour nimbu most homes call kagzi (strictly speaking it’s a lime) grows well in pots and fruits heavily in heat, though it’s the most frost-tender. Larger seedless and “China” lemons are milder, bear in clusters and cope better with cold nights. Both do well in Pakistani and north Indian summers. When you pick fruit, our guide to juicy lemons and storing them picks up from there.
Pot, soil and sun for a lemon tree in a pot
- Choose a pot 35 to 40 cm wide with at least one large drainage hole. Terracotta, cement or a light-coloured plastic tub all work.
- Mix 2 parts garden soil, 1 part compost and 1 part coarse sand or brick grit. It should drain within seconds.
- Set the plant at the same depth it grew in the nursery bag. The graft joint, a slight bump or kink low on the stem, must stay 5 to 8 cm above the soil.
- Water slowly until it runs from the hole, then let it drain.
- Stand the pot on two bricks so water escapes freely and air gets underneath.
- Move up to a 45 to 50 cm pot after 2 or 3 years, in February or March.
Lemon trees want full sun, at least 6 hours and ideally 8. Less sun means fewer flowers, full stop. The catch in a South Asian May is the pot, not the leaves: a black plastic pot on a bare roof can cook the roots. Shade the pot rather than the tree, by grouping smaller pots around it, wrapping it in a jute sack, or standing it behind a low wall. If leaves scorch in 45°C heat, a green net for the hottest weeks helps.
Frost is the other risk, especially for kagzi. On winter nights below about 3°C in Punjab, move the pot against a sunny wall or under a roof, or throw an old cloth over the tree.
Watering, feeding and why flowers and small fruits drop
Watering
Push a finger 5 cm into the soil. Dry? Water deeply. Damp? Wait. In peak summer that may mean every day or two for a pot in full sun; in winter, once a week or less. Citrus roots hate sitting wet, and daily splashes that never reach the bottom of the pot are worse than a deep soak every few days.
Feeding
Lemons are hungry, especially for nitrogen before flowering. Scratch a few handfuls of compost or well-rotted gobar into the top of the pot in February, June and September. A citrus fertilizer from a nursery, used at the rate on its pack, is also fine.
Sarson khal (mustard cake) is the classic desi feed: soak a handful in a bucket of water for 3 to 5 days in the shade with a lid on, then dilute the liquid about 1 part to 10 parts water and pour it on damp soil. It smells strongly, so it’s a balcony job, not a bedroom-window one. Wood ash adds potassium, but go easy. Ash makes soil more alkaline, and most Pakistani and north Indian soils and tap water are alkaline already, which is one reason lemon leaves yellow. A small handful mixed into compost once a year is the most it needs. More kitchen-scrap feeds are in our Zero-Waste Kitchen section.
Why flowers and baby lemons fall off
A lemon tree carries far more flowers than it can ever turn into fruit, and it drops most of them on purpose. Then it drops many pea-sized fruits too, often in early summer. That’s normal. Worry only if every single fruit falls, which usually points to one of these: a bone-dry pot followed by a flood, a sudden heatwave above about 40°C while fruit is tiny, a tree too young or in too small a pot to carry fruit, or no feeding since last year. Steady watering does more than anything else.
Balcony pollination
On a high balcony or indoors, bees may not find the flowers. Lemons can set fruit with their own pollen, and brushing a soft paintbrush across the open flowers once a day during bloom helps it along.
Why are my lemon plant leaves turning yellow?
Look at which leaves yellow, and how. The pattern tells you the cause.
| Pattern | Likely cause | What to do |
|---|---|---|
| Leaves yellow all over, then drop; soil wet | Overwatering, poor drainage | Water less, clear the hole, raise the pot |
| Older leaves evenly pale yellow | Short of nitrogen | Compost or citrus feed |
| New leaves yellow, veins stay green | Iron locked up by alkaline soil or hard water | Compost, no ash, citrus feed with micronutrients |
| Older leaves with a green V at the base | Short of magnesium | Citrus feed containing magnesium |
| Sudden yellowing and drop in winter | Cold or cold, wet roots | Shelter, water less |
Remember that old leaves yellow and drop naturally a few at a time, especially in spring as new growth pushes out. A handful of yellow leaves on a tree full of green ones is just housekeeping.
Suckers below the graft
If shoots with bigger, thornier leaves come from below the graft bump, snap them off. They’re the rootstock trying to take over, and if you let them win you’ll end up with a thorny tree bearing rough, sour jatti khatti fruit.
Leaf miner and the citrus caterpillar
Silvery, wriggly trails inside new leaves, with the leaves curling and twisting, are the work of the citrus leaf miner, a tiny moth larva living inside the leaf. It’s ugly but rarely serious on a mature tree. Pick off the worst leaves and bin them, and don’t overfeed, because the moth loves soft new flushes. Older leaves harden and it moves on.
The citrus caterpillar is the young of the lime butterfly. Small ones look like bird droppings, black and white; bigger ones are fat and green. A few can strip a young plant in days. Pick them off by hand. When touched they push out a pair of orange horns and release a sharp smell; it’s a bluff and completely harmless.
Did you know? The yellow and black lime butterfly lays its eggs mostly on citrus, and it finds a single lemon pot even on a tenth-floor balcony. And a healthy lemon tree can carry flowers, green fruit and ripe fruit all at the same time.
Myth: more fertilizer means more lemons
Too much nitrogen makes a tree throw out long, soft, leafy shoots and fewer flowers, and the soft growth draws leaf miners. Feed three times a year, water steadily, give full sun, and let a young tree grow for a season before expecting a crop.
Lemon and kagzi branches carry sharp thorns, so wear gloves when pruning and keep small children’s faces away. Lemon or lime juice on your hands in strong sun can cause a burn-like rash that leaves dark patches (phytophotodermatitis), so wash your hands with soap after picking or cutting fruit outdoors; the nimbu pani guide explains this sun reaction. Citrus leaves and peel can upset cats and dogs, causing vomiting or drooling, so keep pets from chewing the plant. Never use poison sprays on a tree you pick from. Standing water in saucers breeds mosquitoes; empty them after watering.
Lemon plant in a pot: questions people ask
How long does a lemon plant take to give fruit?
A grafted nursery plant usually fruits within 1 to 2 years. A seed-grown plant often takes five years or more, and some never fruit well in a pot.
Why is my lemon tree not producing fruit?
The usual reasons are too little sun, a seed-grown plant, too much nitrogen, or a pot that’s too small. Irregular watering during flowering also makes flowers and young fruit drop.
What is the best fertilizer for lemon plant?
Compost or well-rotted gobar three times a year, or a citrus fertilizer used as its pack directs. Diluted soaked sarson khal is a good traditional liquid feed. Avoid piling on wood ash in alkaline soil.
Why are my indoor lemon tree leaves turning yellow?
Overwatering is most common. Evenly pale older leaves mean nitrogen hunger, and yellow new leaves with green veins mean iron is locked up by alkaline soil or water.
Why is my lemon plant dropping leaves?
Sudden leaf drop usually follows overwatering, a cold snap, or moving the pot to a very different spot. Keep conditions steady and it regrows in spring.
Can I grow a lemon tree indoors?
Only for part of the year. Indoors it rarely gets enough light to flower well. Keep it outside in sun and bring it in only on frost nights.
Are lemon trees safe for pets?
Not entirely. Citrus leaves and peel contain oils that can upset a cat’s or dog’s stomach. Keep pets from chewing the tree and call a vet if one seems unwell.
Why are my lemons small?
Too many fruits for a small tree, not enough water while they swell, or a hungry pot. Thin crowded clusters to one or two fruits and water steadily through summer.
When should I prune a potted lemon tree?
Lightly, after the main harvest or in late winter. Remove dead, crossing and inward branches and any shoots from below the graft.
Can I grow lemon from a cutting?
It can root, especially kagzi, but cutting-grown plants have weaker roots than grafted ones. A grafted nursery plant is still the surer route to fruit.