🌿 Scientific Name: Citrus × microcarpa
🌿 Common Names: Calamondin Orange, Calamansi, Miniature Orange
🌿 Ideal for: Indoor citrus growing, patios, small gardens, conservatories
🌿 Hardiness: Hardy down to -5°C , best grown in pots in the UK

Introduction to Calamondin Citrus Trees

The Calamondin citrus tree ( Citrus × microcarpa ), also known as Calamansi or Miniature Orange , is one of the best citrus trees for UK gardeners due to its compact size, ornamental appeal, and high yield of small, tangy fruit . Unlike larger citrus trees, the Calamondin thrives in containers , making it ideal for growing on patios, balconies, conservatories, or indoors .

Calamondin trees bloom throughout the year , producing fragrant white flowers that give way to small, bright orange fruit . The fruit is highly sour and tangy , often used in juices, marmalades, and as a substitute for lemons or limes .

Benefits of Growing Calamondin in the UK

✅ Produces abundant fruit year-round
✅ Compact and ideal for container growing
✅ Tolerates cooler temperatures better than other citrus varieties
✅ Fragrant white flowers provide a sweet citrus scent
✅ Thrives indoors or outdoors in summer

With the right soil, watering, and care , both Mini Calamondin Citrus Trees and Medium Calamondin Citrus Trees can flourish in the UK. Below is a complete step-by-step care guide to help you grow them successfully.

Optimal Growing Conditions for Calamondin Citrus Trees

Calamondin citrus trees require a warm, sunny environment to thrive. While they are hardier than other citrus trees , they still need protection from frost and plenty of light .

Sunlight Requirements

🌞 Needs at least 6-8 hours of direct sunlight daily
🌞 Best placed in a south-facing window, conservatory, or patio
🌞 If growing indoors, supplement with a grow light in winter

Temperature & Humidity Needs

🌡️ Thrives in 15°C – 30°C temperatures
🌡️ Can tolerate as low as -5°C but should be protected from prolonged frost
💦 Prefers moderate to high humidity (50-70%)

Humidity Tips for Indoor Growing:

• Mist leaves 2-3 times a week

• Place the pot on a tray filled with water and pebbles

• Avoid placing near radiators or dry heat sources

Planting and Soil Requirements for Calamondin Citrus Trees

Best Soil Mix for Calamondin Trees

Calamondin trees prefer well-draining, slightly acidic soil to prevent root rot.

Ideal soil mix:
✅ 60% loam-based compost (e.g., John Innes No.2 or No.3)
✅ 30% horticultural grit or perlite (to improve drainage)
✅ 10% organic matter (composted bark or coconut coir)

📌 Avoid heavy clay soils , as they retain excess moisture and may cause root diseases.

How to Plant a Calamondin Tree (Step-by-Step Guide)

1️⃣ Choose a large pot (at least 30cm wide with drainage holes).
2️⃣ Fill with citrus compost , leaving space at the top for watering.
3️⃣ Plant at the same depth as in its nursery container.
4️⃣ Water well after planting , ensuring excess water drains away.

📌 Repot every 2-3 years  to refresh the soil and prevent root-binding.

Watering & Feeding Calamondin Citrus Trees

How to Water a Calamondin Tree

💧 Water when the top 2-3cm of soil feels dry
💧 Reduce watering in winter when growth slows
💧 Always use rainwater or filtered water if possible to prevent lime buildup

Fertilising Your Calamondin Tree

🍊 Spring-Summer: Feed every 2 weeks with a Citrus Summer Soluble Feed to encourage healthy fruiting and growth.
🍊 Autumn-Winter: Reduce feeding to once a month and switch to a Citrus Winter Soluble Feed to maintain essential nutrients during the dormant season.
🍊 Use a fertiliser high in nitrogen (NPK 5-1-3) to promote growth

FAQs About Calamondin Citrus Trees

Can I grow a Calamondin citrus tree indoors in the UK?

Yes, Calamondin citrus trees can thrive indoors in the UK as long as they receive plenty of sunlight. Place them in a south-facing window or conservatory to get at least 6-8 hours of direct sunlight daily . If natural light is insufficient, supplement with a grow light . Indoor humidity should be maintained with regular misting or a humidity tray to prevent leaf drop. Ensure the pot has good drainage to avoid root rot.

How often should I water my Calamondin citrus tree?

Calamondin trees require moderate but consistent watering . Water when the top 2-3cm of soil feels dry to the touch. During summer, you may need to water twice a week , while in winter, watering should be reduced to once every 10-14 days . Always ensure the pot has proper drainage and avoid overwatering, as soggy soil can cause root rot.

What is the best fertiliser for Calamondin citrus trees?

For optimal growth and fruiting, use a citrus-specific fertiliser . In the growing season (spring to summer), apply Citrus Summer Soluble Feed every two weeks . In autumn and winter, switch to Citrus Winter Soluble Feed once a month to maintain essential nutrients without overstimulating growth.

How long does it take for a Calamondin citrus tree to bear fruit?

A young Calamondin citrus tree typically starts producing fruit within 1-2 years after planting. Trees grown from seeds take longer, often 4-5 years . Proper sunlight, watering, and feeding will encourage faster fruit production. Since Calamondin trees are everbearing, they can flower and fruit multiple times a year under the right conditions.

How do I prune a Calamondin citrus tree?

Prune your Calamondin citrus tree in early spring to shape the canopy, remove dead or damaged branches , and encourage bushier growth. Use sharp, clean pruning shears to make clean cuts and avoid infections. Removing excess growth allows better air circulation and more sunlight penetration , improving fruit production.

Why are the leaves on my Calamondin citrus tree turning yellow?

Yellow leaves can be caused by overwatering, nutrient deficiencies, or insufficient light . Ensure the soil is well-draining , and adjust your watering routine accordingly. A lack of nitrogen is a common cause—feed with a citrus-specific fertiliser to correct deficiencies. If grown indoors, check that the plant is receiving enough sunlight .

Can I grow a Calamondin citrus tree outside in the UK?

Yes, Calamondin citrus trees can be grown outdoors in the UK during spring and summer , but they should be moved indoors or into a greenhouse when temperatures drop below 5°C . In mild coastal regions, they may survive outside year-round if given proper protection from frost .

How big does a Calamondin citrus tree grow?

Calamondin trees remain small and compact , growing to around 1-2 metres in a pot. Their size makes them ideal for small gardens, patios, and indoor spaces . Regular pruning can keep them even smaller and more manageable .

Do Calamondin citrus trees self-pollinate?

Yes, Calamondin citrus trees are self-pollinating , meaning they do not require another tree for fruit production. Indoors, gently shake the flowers or use a small paintbrush to help transfer pollen between blooms and improve fruit set.

How do I prevent pests on my Calamondin citrus tree?

Common pests include aphids, scale insects, and spider mites . To prevent infestations, regularly inspect leaves and stems. If pests appear, wipe them off with a damp cloth , spray with neem oil , or use insecticidal soap . Keeping humidity levels high indoors also helps deter spider mites.

What should I do if my Calamondin citrus tree drops its fruit before ripening?

Fruit drop is usually caused by overwatering, sudden temperature changes, or nutrient imbalances . Ensure the tree is watered consistently , avoid moving it suddenly between locations, and feed with a balanced citrus fertiliser to provide essential nutrients.

Can I eat the fruit from a Calamondin citrus tree?

Yes! Calamondin oranges are edible , though they are very sour . They are often used in juices, marinades, marmalades, or as a substitute for lemons or limes . Many people prefer to sweeten the juice before consuming it.

How do I repot a Calamondin citrus tree?

Repot every 2-3 years in fresh citrus compost . Choose a pot one size larger than the current one, ensuring good drainage holes . Repotting helps refresh nutrients and prevents the tree from becoming root-bound .

What temperature can a Calamondin citrus tree tolerate?

Calamondin citrus trees can handle temperatures down to -5°C , but they thrive best in temperatures between 15-30°C . If a frost is expected, move the tree indoors or use a horticultural fleece for protection.

Where can I buy a Calamondin citrus tree?

You can purchase high-quality Mini and Medium Calamondin Citrus Trees from Web Garden Centre and Web Garden Centre . They offer a variety of citrus trees suited for UK growing conditions .

Final Thoughts on Growing Calamondin Citrus Trees

Calamondin citrus trees are one of the best citrus varieties to grow in the UK due to their compact size, hardy nature, and high fruit production . Whether you choose a Mini Calamondin Citrus Tree or a Medium Calamondin Citrus Tree , with the right care, you’ll enjoy fragrant blossoms, lush green leaves, and tangy fruit all year round .

By following these care tips , your Calamondin tree will thrive indoors, on a patio, or in a conservatory, making it a fantastic addition to any UK home or garden .