Grown widely in Iran, Sweet Persian Lemons are unique, they are sweet in fact sweeter than any other lemons. They are best described as having the sweetness of an orange without the acidity.
This is a tree that grows in every household in Iran and it fruits from late summer through to spring. It is used to help ward off coughs and colds of winter as well as slightly sweet treat.
The botanical name is Citrus limetta and is commonly called Limoo Shirin -or Limu shirin and also known as trhe Persian Lime
The fascinating thing about this lemon is that although when first cut it tastes mildly sweet, then about 1 hour after it is cut it becomes sour.
So why is this lemon so popular?
It is only in Iran that they are widely grown, however they are finding a place in gardens around the world.
How to use the fruit
Sweet Persian Lemons are valued because they are versatile and easy to use. It is a lemon that is very high in vitamin C as well as containing good amounts of vitamin A in the rind.
- Eat the fruit fresh.
- Add slices to tea. – When fresh it can be squeezed into tea as a sweetener.
- Use the juice in drinks and syrups.
- Preserve or freeze the juice.
- Use it in marinades, desserts, and traditional Iranian recipes.
- You can also use the fruit in traditional Iranian cuisine.
Because the flavour changes after cutting, it is best to use the fruit soon after slicing.
Where it grows
Sweet Persian Lemons grow best in warm, frost-free or lightly frosted climates. They are especially suited to subtropical and Mediterranean-style regions, and they perform well in areas where citrus trees are commonly grown.
In general, this tree is suitable for USDA zones 8 to 11, although it will need protection from cold weather in the cooler parts of zone 8. In colder climates, it is often best grown in a large container so it can be moved to shelter during winter.
It is grown in parts of Iran, as well as in other warm regions such as the Mediterranean basin and some coastal areas of southern California.
Climate zones
If you are thinking about growing Sweet Persian Lemon, the most important thing is warmth. Citrus trees dislike hard frost, and this one is no exception.
A simple way to think about it is:
- Best climate: subtropical, warm temperate, and Mediterranean.
- USDA zones: 8–11, with frost protection needed in colder zones.
- Best for: coastal gardens, sunny courtyards, protected courtyards, and warm inland areas with mild winters.
- Less suitable for: areas with regular heavy frost or long cold winters.
In Australia, it is likely to suit warm citrus-growing regions, especially frost-free or near-frost-free areas, and it can also be grown in pots where winters are cooler. In the USA, it is available through specialty citrus sellers and home gardeners in warm states, including California, where citrus production is strongest. In Europe, it is more likely to be found through specialty importers, Middle Eastern grocers, and niche online produce sellers rather than mainstream supermarkets.
How To Grow Persian Limes – basic Care
Like most citrus trees, Sweet Persian Lemons need a well-drained soil and plenty of sun to grow well. They are self-pollinating, so only one tree is needed, and they usually flower for a long period.
It is best to buy a grafted tree, as these generally begin fruiting sooner, often within about two years. Regular watering, good feeding during the growing season, and protection from frost will help the tree stay healthy and productive.
If growing in a pot, choose a large container with free-draining potting mix and move it to a sheltered position in cold weather.
A healthy Sweet Persian Lemon tree will reward you with fragrant flowers and useful fruit over a long season. Give it full sun, rich but well-drained soil, and steady moisture without waterlogging.
Mulching around the base can help conserve moisture and protect the roots, but keep mulch away from the trunk. Feeding with a citrus fertiliser during the growing season can also support flowering and fruiting.
Prune lightly to shape the tree and remove weak or crowded growth. In cooler climates, protect young trees from wind and frost.
Common growing problems
Sweet Persian Lemons are a lovely citrus to grow, but they can be a little more sensitive than other lemon trees. They do best when they are given warmth, good drainage, and steady care.
Some of the most common problems include:
- They do not like cold weather or wet soil.
- Their roots can be sensitive, so they need the right growing conditions to stay healthy.
- They may need to be grafted onto a suitable rootstock in some climates.
- They can be more prone to pests, canker, and fungal problems than stronger lemon varieties.
- They do not like sudden changes in watering.
- If the soil dries out too much and is then watered heavily, the fruit may split or drop.
- They can also show nutrient problems, especially if the soil is too alkaline or low in trace elements.
A healthy tree will usually have glossy green leaves and steady growth, so any yellowing, leaf drop, or fruit loss is worth checking early. Keeping the soil well drained, watering regularly, and feeding with a good citrus fertiliser will help the tree stay in better condition.
Growing In Pots to Overcome Problems
Growing Sweet Persian Lemons in a pot can actually help overcome several of these problems, especially in cooler or less‑ideal climates.
Potted growing lets you:
- Control cold exposure: Move the tree to a sheltered spot or indoors during frosts or cold snaps, which protects the sensitive roots and reduces winter stress.
- Manage water precisely: Use a lightweight, free‑draining potting mix so the tree is less likely to sit in waterlogged soil, cutting the risk of root rot and sudden moisture swings.
- Avoid heavy clay or alkaline soils: You can choose a slightly acidic to neutral citrus‑specific mix, reducing the chance of iron and calcium deficiencies and yellowing leaves.
- Limit disease spread: Being in a container makes it easier to spot pests and disease early and take action before they move into the wider garden.
In short, growing in a large pot is often a very good option for Sweet Persian Lemons, especially if you live in a cooler or unpredictable climate. Just make sure the pot is big enough, the potting mix is well drained, and the tree still gets plenty of sun and regular feeding.