Citrus ‘Arcobal’

From Italian citrus breeding to ‘Arcobal’

‘Arcobal’ was created by crossing a Meyer lemon with a double blood orange in an Italian ornamental-citrus breeding programme and was released in Italy in 2012. Its family tree brings together several old cultivated lineages: Meyer lemon carries citron and mandarin-pomelo ancestry, while the blood-orange parent belongs to the sweet-orange group derived from mandarin and pomelo.

Those ancestral citrus developed across tropical and subtropical Asia, but ‘Arcobal’ itself belongs to the modern Mediterranean history of ornamental citrus. It has no wild population or native range of its own. Its evergreen growth and repeated seasonal flushes reflect the warm-climate background inherited from both parents, while its striped red-orange fruit is the distinctive result of deliberate horticultural selection.

Care for woody plants in containers

Light

Give Citrus ‘Arcobal’ the sunniest indoor position available: directly at a south- or south-west-facing window, or at an east window supported by a grow light. Acclimated foliage tolerates full sun, including an outdoor summer stay, but sudden exposure behind hot glass can scorch leaves and fruit.

Watering

Allow the surface of the potting mix to partially dry, then check below the surface and water only when the centre is no longer wet. Citrus ‘Arcobal’ can shed flowers, young fruit or leaves after a prolonged dry spell.

Substrate and roots

Citrus forms a dense network of fine feeder roots that needs both moisture and air. Use a slightly acidic citrus or loam-based container substrate opened with fine bark, pumice or perlite, so water passes through readily but the root ball does not become dry immediately.

Humidity and airflow

Ordinary household humidity is usually sufficient if the root ball dries at a steady pace. Moderately higher humidity can reduce leaf-tip drying and helps tender new growth in a heated room, but it does not compensate for low light.

Fertilising

Use a complete citrus fertiliser that supplies nitrogen, potassium, magnesium and trace elements such as iron, manganese and zinc. Apply it according to the product label while the plant is actively making shoots, flowers or fruit; use the lower end of the labelled rate for a small plant, a recently repotted root ball or a specimen growing slowly.

Problems to watch for on Citrus ‘Arcobal’

• Several green leaves fall soon after a move: A sharp change in light, temperature or root moisture can trigger delayed leaf loss. Keep conditions stable, feel the potting mix below the surface before watering and use the pattern of fallen leaves to narrow the cause with the houseplant leaf-drop guide
• Leaves yellow while the pot remains heavy: Roots may be short of oxygen in compacted or persistently wet substrate. Let the upper part of the mix begin to dry, empty the outer pot after watering and inspect the roots if wilting continues despite moist soil.
• Sticky leaves, firmly attached brown bumps or pale speckles: Sticky residue and shell-like bumps point towards scale; fine speckling and webbing suggest spider mites. Move Citrus ‘Arcobal’ away from other plants and inspect the stems and leaf undersides. Choose a pest treatment intended for indoor plants, follow its label and reach every infested surface. The scale identification guide explains how to distinguish live insects from old shells.
• Striped or red-blushed fruit: Uneven orange, red and green colouring is normal for ‘Arcobal’. Soft sunken areas, spreading brown tissue or fruit that drops together with declining leaves require closer inspection of moisture, roots and temperature.

Keep Citrus ‘Arcobal’ away from pets

• The fruit flesh is edible, while leaves, peel and other plant material can irritate cats and dogs.
• These parts contain essential oils and psoralens that may cause vomiting, stomach pain, unusual tiredness or skin irritation.
• Contact a veterinarian if a pet chews the plant or develops symptoms. Seek medical advice if a person becomes unwell after exposure.

Why is it called Citrus?

Citrus is the classical Latin name used for citron and related citrus plants.

Carl Linnaeus established the genus Citrus in 1753 in Species Plantarum, page 782.