Alstroemeria Cultivation: Varieties, Propagation, and Growing Conditions

Alstroemeria, widely known as the Peruvian lily or Inca lily, is one of the most valued ornamental plants in the global cut flower industry. Native to South America, with species found from Venezuela to Tierra del Fuego in Argentina , this rhizomatous perennial produces clusters of strikingly patterned, lily-like flowers in an impressive range of colours. Available year-round in a wide variety of shades , Alstroemeria is prized both for garden display and for its exceptional vase life, which can extend up to two weeks under proper care. Whether you are a commercial floriculturist or a home gardener, understanding how to cultivate, propagate, and manage this versatile plant is essential for getting the best results.

Botanical profile and origin 🔗

The genus Alstroemeria belongs to the family Alstroemeriaceae, a small family of flowering plants closely related to the Liliaceae family, comprising approximately 50-60 species . Despite its common names – Peruvian lily and lily of the Incas – it is not a true lily. The genus was named after the Swedish naturalist Baron Clas Alströmer, a student of Carl Linnaeus, who first collected seeds of these species in South America and sent them to Europe .

The leaves of Alstroemeria are alternately arranged and resupinate – twisted on the petioles so that the undersides face upward . The flowers are borne in terminal clusters called umbels, with each flower having six tepals that can reach up to 5 cm in length. Flower colours include pink, red, orange, yellow, white, and purple, often marked with contrasting streaks, spots, or stripes on the inner petals . The plant grows from underground rhizomes – modified horizontal stems that store energy and produce new shoots – allowing it to form dense colonies over time.

Important species of Alstroemeria 🔗

Several wild species have been instrumental in developing the modern hybrids grown commercially today. Here are the most important ones:

Alstroemeria aurea 🔗

Alstroemeria aurea is widely planted in borders, cottage gardens, and cutting beds, and its blooms hold up well in floral arrangements . The cultivar ‘Lutea’ produces bright yellow flowers, stands 60-90 cm tall, and is considered a garden classic . This species is native to Chile and southern Argentina and is one of the hardiest in the genus.

Alstroemeria ligtu 🔗

Alstroemeria ligtu is found in the Andes of Chile and has four recognised subspecies : ssp. ligtu (pink flowers with dark red streaks), ssp. incarnata (large pink flowers), ssp. simsii (orange-red flowers), and ssp. splendens. This species is widely used in breeding programmes for commercial cut-flower varieties because of its strong stems and long vase life .

Alstroemeria pelegrina 🔗

Alstroemeria pelegrina was the first species in the genus to be taken to Europe and cultivated there, dating back to 1744 . It is known for its large, open flowers with bold purple markings and is frequently used in breeding programmes to develop large-flowered hybrids .

Alstroemeria psittacina 🔗

Often called the “parrot lily” due to its vivid red flowers tipped with green, A. psittacina is native to Brazil, Paraguay, and Argentina . It has a spreading habit and is useful as ground cover in suitable climates.

Popular commercial varieties and series 🔗

Over 190 cultivars have been developed, featuring a wide spectrum of markings and colours . Three main breeders globally produce new varieties, selecting primarily for colour, form, productivity, seasonal production, and disease resistance . The most popular modern hybrids result from crosses between Chilean winter-growing species and Brazilian summer-growing species, overcoming seasonal dormancy to produce plants that bloom for most of the year .

Some widely recognised commercial series include:

Inca series: Compact plants (30-45 cm tall) ideal for gardens and containers, including cultivars like ‘Inca Ice’ (creamy apricot), ‘Inca Joli’ (bright red), and ‘Inca Bandit’ (deep red with gold spotting) .

Princess (Colorita) series: Ultra-compact varieties (25-30 cm) suited for pot culture. The butterfly-type cultivars in this series flower for 9-12 months each year, with shorter growth habits and larger, more open flowers .

Inticancha series: Modern hybrids standing 20-30 cm tall, including ‘Inticancha Passion’ (purple with white centres) and ‘Inticancha Diva’ (orange with yellow accents) .

Cut flower hybrids: Varieties such as ‘Virginia’ (pure white, popular for weddings), ‘Rebecca’ (bright pink), and ‘Sweet Laura’ (yellow with red streaks – a rare scented cultivar) are widely grown for the floral trade .

Propagation methods 🔗

Alstroemeria can be propagated through three main methods: rhizome division, seed sowing, and tissue culture (micropropagation). The choice of method depends on the scale of production and the specific goals of the grower.

Rhizome division 🔗

Vegetative propagation by rhizome division has been the most common method, though it has limitations including low efficiency, high time consumption, and a risk of virus dissemination . The best time for division is during the dormant period in late autumn or early spring. Cut the plants 15-20 cm above the ground about 10-15 days before dividing, then dig up the rhizomes carefully since they grow 30-40 cm deep .

Each divided section should include at least three to five growing points along with some healthy roots. Allow the cut surfaces to dry for a few hours before replanting to reduce the risk of rot. Plant divisions 15 cm deep and space them 30-45 cm apart; plants will typically flower 10-15 weeks after planting .

Seed propagation 🔗

Seeds can be sown from November through June; soak them for 12 hours, then cover lightly with potting mix in a seed tray . Seeds require cold stratification at about 2-4°C for 4-6 weeks to break dormancy. Germination is erratic and slow, with only about 20% of seeds typically sprouting . Seedlings have very brittle roots and need careful handling during transplanting. Plants started from seed can take 12-18 months to reach flowering maturity.

Tissue culture (micropropagation) 🔗

Commercial growers increasingly rely on tissue culture for large-scale multiplication. Rhizome sections are the most common explant used for in vitro propagation of Alstroemeria . The Murashige and Skoog (MS) medium supplemented with cytokinins such as BAP (benzylaminopurine) is commonly used to promote rhizome proliferation and shoot development. A rhizome-splitting technique has been shown to increase propagule production by up to 194-213% over a 12-week period, with the resulting plants rooting and flowering normally . Tissue culture also helps produce virus-free planting material, which is a significant advantage over traditional rhizome division.

Climate and growing conditions 🔗

Alstroemeria thrives in climates that mimic its native South American mountain habitats – moderate temperatures, good air circulation, and distinct seasonal changes.

Temperature 🔗

The ideal daytime temperature range for Alstroemeria is 18-24°C, with night temperatures above 10°C. Flower initiation and development result from complex interactions between temperature perceived by the rhizome and photoperiod, with long days and low soil temperatures promoting flowering . Excessively high soil temperatures (above 25°C) can inhibit flowering and cause dormancy. In warmer climates, soil cooling techniques or heavy mulching can help moderate root-zone temperatures.

Light 🔗

Alstroemeria grows best in full sun, especially if the soil surface is shaded from direct sun with mulch and adequate water is provided . As a general rule, more shade results in fewer flowers. However, in very hot regions, afternoon shade is beneficial to prevent leaf scorch and extend bloom duration.

Soil requirements 🔗

Alstroemeria is happy in most soil types, as long as the soil is free-draining and not prone to waterlogging – the roots may rot in damp conditions, especially in winter . The ideal soil pH ranges from 6.0 to 7.0 (slightly acidic to neutral). Heavy clay soils should be amended with coarse sand, perlite, or grit to improve drainage. Raised beds (15-20 cm high) are recommended in areas with poor natural drainage. Work in 5-7 cm of compost or well-aged manure before planting to improve soil structure and provide slow-release nutrients.

Planting and spacing 🔗

Ideally, plant Alstroemeria in spring so plants can settle in before flowering, spacing them 60 cm apart for border plantings. For commercial cut flower production, tighter spacings of 30-45 cm may be used within rows, with rows spaced 60-90 cm apart to allow for management access. Plant rhizomes 15-20 cm deep in well-prepared beds, and cultivate the planting bed to at least 38 cm deep before planting . Adding bone meal to the planting hole supports early root development.

For container cultivation, use pots at least 30 cm deep with good drainage holes. Alstroemeria cultivars grow well in 15 cm pots or larger, with 20 cm pots and gallon containers making attractive displays .

Irrigation and mulching 🔗

While it is important to water newly planted Alstroemeria during dry spells, overwatering can cause root rot . Water at soil level rather than overhead to prevent fungal diseases. Drip irrigation or soaker hoses are the most effective systems for Alstroemeria beds. During active growth, water deeply once or twice a week, allowing the top few centimetres of soil to dry between waterings. Reduce watering significantly during winter dormancy.

Apply 5-7 cm of organic mulch (shredded bark, straw, or compost) around plants, keeping it several centimetres away from the crown to prevent rot. Mulching helps conserve moisture, suppress weeds, and – critically in warm climates – keep soil temperatures cool around the rhizomes.

Fertilisation 🔗

A slow-release fertiliser should be added in spring to encourage flowering, with a high-potash fertiliser recommended for container-grown plants . For garden-grown plants, apply a balanced fertiliser (such as 10-10-10) monthly during the active growing season, or use a slow-release formulation twice – once in early spring and again in mid-summer. Phosphorus is particularly important for promoting flower production and root development. Avoid excess nitrogen, which encourages leafy growth at the expense of blooms.

Pest and disease management 🔗

Alstroemeria is relatively pest-resistant, but a few issues can arise, especially under stressful growing conditions.

Common pests 🔗

Aphids: These cluster on tender shoot tips, particularly during hot, dry spells or on drought-stressed plants . A strong spray of water every 2-3 days can dislodge them; persistent infestations can be treated with insecticidal soap.

Spider mites: These cause fine stippling on the undersides of leaves and appear during hot, dry conditions . Maintaining adequate humidity and regular water sprays help manage them.

Slugs and snails: These may attack the young spring growth of Alstroemeria and should be controlled with environmentally friendly barriers or bait .

Whiteflies and caterpillars: Check regularly and apply a suitable garden insecticide if spotted .

Common diseases 🔗

Root rot: Excess winter moisture can cause the fleshy roots to rot . Prevention through proper drainage and soil preparation is far more effective than any treatment once rot sets in.

Botrytis (grey mould): This appears as fuzzy grey patches on flowers and stems in cool, humid conditions with poor air circulation . Remove and discard infected parts immediately, improve plant spacing, and apply a copper-based fungicide at the first sign of infection.

Viral diseases: Mosaic viruses, spread by aphids and thrips, can also attack Alstroemeria – the two most common being tomato spotted wilt virus and Hippeastrum mosaic virus . There is no treatment for viral infections; affected plants must be removed and destroyed, and all tools should be disinfected.

Flower harvesting techniques 🔗

Proper harvesting significantly impacts both the continued productivity of the plant and the longevity of cut stems.

Timing: Harvest flowers early in the morning when stems are fully hydrated. Cut stems when the first two or three flowers in a cluster begin opening – the remaining buds will continue to open in the vase.

Method: The best way to harvest Alstroemeria is to pull the stems like rhubarb rather than cutting them – hold the lower part of the stem and give it a quick, firm pull . This method stimulates the rhizome to produce more flowering stems and results in longer usable stems. Using this pulling technique encourages new bud growth and increased flowering .

Immediately place harvested stems in clean, cool water. Remove any foliage that would sit below the waterline in arrangements, as submerged leaves promote bacterial growth and shorten vase life.

Post-harvest handling 🔗

Post-harvest care is critical for maintaining the quality of Alstroemeria as a cut flower, especially in the commercial supply chain.

Ethylene sensitivity: Most Alstroemeria varieties are sensitive to ethylene, which causes symptoms like flower wilting, petal shattering, and leaf yellowing . Treating harvested stems with an ethylene action inhibitor (such as silver thiosulfate or 1-MCP) helps extend vase life significantly.

Hydration and conditioning: Conditioning the product with solutions containing gibberellins and cytokinins at the farm level helps prevent leaf yellowing – a common quality issue with Alstroemeria . Place stems in a commercial flower preservative solution as soon as possible after harvest.

Cold chain management: Following strict cold chain protocol, Alstroemeria can be stored for up to 5 days . Maintain temperatures of 2-4°C during storage and transit. Avoid overpacking buckets to allow air circulation and prevent mechanical damage to the soft stems.

Consumer care: Re-cut stems at an angle and place in clean water with flower food. Change the water every 2-3 days. Flower food is especially important to keep petal colour from fading over the course of vase life . With proper handling, a vase life of 7-14 days is achievable.

Deadheading and seasonal care 🔗

Regular deadheading throughout the blooming season encourages continued flower production. As mentioned, pulling the entire stem from the base rather than snipping off the flower head is the preferred method. In winter, tidy up old foliage and cut back stems to about 5 cm from the base . In colder regions (USDA zones 6 and below), apply a thick layer of mulch (10-15 cm of leaves or straw) over the crowns for winter protection, or lift and store rhizomes in a frost-free location.

Established clumps can be divided every couple of years to reduce congestion and rejuvenate the planting . Division is best done in early spring when new growth is just beginning.

Why Alstroemeria matters in modern floriculture 🔗

Commercial cultivation of Alstroemeria is concentrated in countries like the Netherlands, Colombia, Ecuador, and the United States . The Netherlands, in particular, is the global hub for Alstroemeria breeding and greenhouse production. The main breeding work is done nowadays by companies in the Netherlands , where controlled environments allow year-round production. The flower’s outstanding vase life, wide colour range, lack of fragrance (beneficial for allergy sufferers), and relatively low production costs make it a staple in the global floral market. For growers in India and other tropical or subtropical regions, greenhouse or polyhouse cultivation with soil cooling systems can make Alstroemeria a profitable crop, especially targeting the domestic and export cut flower markets.

What do you think? Given the growing demand for long-lasting cut flowers in India’s floriculture industry, do you see Alstroemeria as a viable commercial crop for your region? What growing challenges – particularly related to high summer temperatures – would you anticipate, and how might you overcome them?

References

1. https://en.wikipedia.org/wiki/Alstroemeria
2. https://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392017000100012
3. https://gardenerspath.com/plants/perennial/alstroemeria/