Philodendron lacerum – Lacerum Philodendron
Philodendron lacerum is one of the Caribbean's most distinctive philodendrons - an evergreen vine from the arum family (Araceae) whose mature leaves look as though someone deliberately tore their edges. This very feature was immortalized in the species name by Austrian botanist Nikolaus Joseph von Jacquin, who described the plant in the 18th century as Arum lacerum. In 1829, Heinrich Wilhelm Schott, the founder of modern arum-family taxonomy, transferred it to the genus Philodendron, establishing the combination still used today: Philodendron lacerum (Jacq.) Schott.
The species is native to the Greater Antilles: it grows in Cuba, Jamaica and Hispaniola, namely in Haiti and the Dominican Republic. Outside its natural range, it has entered tropical cultivation and become naturalized in some places, including Hawaii and the Philippines, where it is known by the local name "bagawak". It remains a relatively rare plant in European collections, valued by arum enthusiasts for its unusual leaf shape and vigorous, climbing growth.
Botanical description and plant habit
Philodendron lacerum is a hemiepiphyte and may also be an epiphyte. This means that a young plant may begin life in the forest litter and then climb a tree trunk, or germinate directly high in the canopy, in a pocket of humus between branches, sending its roots down toward the ground from there. The stem is climbing, with internodes about 4-8 cm long; adventitious roots emerge from each node, attaching the shoot to the bark and absorbing water and minerals from rainwater running down the trunk. Mature specimens can reach several metres in nature and, according to some sources, even around 10 metres in height.
The leaves are distinctly two-toned: the upper surface of the blade is green to grey-green and semi-matte, while the lower surface is darker and shinier. The blade is moderately leathery, noticeably stiffer than that of philodendrons with thin, delicate leaves, but less rigid than that of epiphytic species from drier habitats. The midrib is sharply raised and slightly lighter on the upper side. The blade reaches about 50 cm in length and 20-25 cm in width; the leaves are borne on smooth, rounded, slightly flattened petioles 20-35 cm long. New leaves emerge from the cataphylls that enclose them, meaning scale-like protective leaves that can reach 40 cm in length and fall off after the blade unfolds.
The most intriguing feature of the plant's habit is the leaf margin. In seedlings and young shoots, the blade is almost entire, at most slightly wavy. As the plant matures and climbs toward the light, successive leaves develop increasingly deep, irregular cuts that, in adult specimens, reach roughly halfway from the margin to the midrib. The effect resembles a blade torn by the wind - hence the Latin adjective lacer, "torn, ragged". This heterophylly, or variation in leaf shape depending on age, is typical of many climbing arums.
Growth rate and development
Under favorable conditions - warmth, high air humidity, and stable support - Philodendron lacerum grows moderately quickly to quickly. New leaves appear regularly throughout the growing season, and the stem lengthens by developing additional internodes. Support plays a key role: aerial roots that reach moist material (moss, coconut fiber, bark) allow the plant to "believe" it is climbing a tree and switch to producing large, mature leaves with deep lobes. Stems left without support trail down, grow more slowly, and may retain juvenile leaves for years.
When grown indoors, a well-trained plant reaches a height of 2–3 meters within a few years, while in a greenhouse or conservatory it may cover an entire wall with greenery. It is a long-lived plant; in nature, individual specimens live for decades, continually renewing their leaves and growing from the tip. Older, lower sections of the stem gradually lose their leaves, which is a natural process - in the forest, a vine has foliage only in the tree canopy anyway.
Flowering and propagation
The inflorescence of a philodendron is a spadix surrounded by a spathe - a structure typical of the entire arum family. In Philodendron lacerum, 2–3 upright inflorescences usually develop at one node, on stalks 20–30 cm long. The slender spathe is 10–15 cm long and approximately 5–7 cm wide; its lower, tubular part is purple inside, while the opened upper part is sulfur yellow to ivory. The cylindrical, shortly stalked spadix, approximately 10 cm long, bears female flowers in its lower part, a zone of sterile flowers above them, and male flowers at the top. In nature, beetles attracted by the scent and heat emitted by the spadix act as pollinators; after pollination, small berries several millimeters long develop on the spadix.
In cultivation, the plant is propagated vegetatively from stem cuttings containing at least one node with an aerial root, and also from seeds when pollinated inflorescences are available. Flowering at home is rare and occurs in large, mature specimens grown in near-greenhouse conditions.
Environmental requirements and tolerance
The species' natural habitat is the humid tropical forests of the Greater Antilles, where temperatures remain around 20–30 °C throughout the year and air humidity often exceeds 80%. The plant grows in the shade of tall trees, so it receives light that is diffuse and filtered through the canopy. These conditions determine its cultivation requirements: bright but indirect light, consistently moist growing medium and air, and protection from cold.
Philodendron lacerum does not tolerate low temperatures. Below approximately 13 °C, growth stops; at 10 °C, leaf damage appears, and frost kills the plant. This corresponds to USDA hardiness zone 11. On the other hand, it is fairly tolerant of short-term drying of the substrate, provided that air humidity remains high - a typical characteristic of epiphytes, whose roots may periodically be exposed to air in nature. It tolerates constant waterlogging and heavy, compacted soil much less well.
Cultivation in a temperate climate
In cooler regions of Europe, Philodendron lacerum is exclusively a container plant. It feels best in a heated interior, conservatory or greenhouse, where the temperature does not fall below 15 °C. In summer, it can be placed on a sheltered balcony or terrace in partial shade, but it must be brought indoors before nighttime temperatures fall below the low teens. The site should be bright, with filtered light; strong midday sun through glass causes yellowing and brown scorch marks on the leaf blades.
The substrate should be loose, airy and rich in humus. A mixture of peat or good compost with pine bark, perlite and coconut fiber works well - the kind used for epiphytic aroids. Water moderately, keeping the soil consistently slightly moist and allowing the top layer to dry out between waterings; in winter, with shorter days and lower temperatures, watering should be reduced considerably. During the growing season, it is worth fertilizing every 2–4 weeks with diluted fertilizer for foliage plants. High air humidity can be provided by placing the pot on a tray filled with expanded clay, grouping plants together or using a humidifier; spraying the leaves works only briefly and does not replace humidifying the air.
A support is essential if you want to obtain mature, deeply lobed leaves. A moss or coconut-fiber pole kept slightly moist works best, allowing aerial roots to attach to it. Prune the stems as needed in spring, and root the resulting sections with a node in water or moist sphagnum. The most common cultivation problems are root rot caused by overwatering, spider mites in dry air and mealybugs; regularly inspecting the undersides of the leaves allows you to respond early.
Uses in ornamental horticulture
Philodendron lacerum is grown primarily for its leaves. Trained on a tall pole, it creates a vertical accent in a bright living room, hallway or office; in botanical greenhouses and winter gardens, it is sometimes planted at the base of trunks or columns, which it eventually wraps around completely. Large hanging containers allow it to be displayed in a trailing form, although the leaves remain smaller then. In tropical and subtropical regions, it is sometimes used to cover walls and gazebos as a garden climber.
It is important to remember that all parts of the plant contain calcium oxalate crystals, which cause intense burning, swelling of the lips, tongue and throat, and drooling when chewed. The species is toxic to cats, dogs and other pets, while the sap may irritate sensitive skin - gloves should be worn when pruning. For the same reason, keep the plant out of the reach of small children.
Cultural significance, history and name etymology
The genus name Philodendron comes from Greek: philo - "to love" and dendron - "tree", aptly describing the climbing, "tree-loving" habit of most species. The epithet lacerum is Latin for "torn, ragged" and refers to the irregularly incised margins of mature leaves. The plant is one of the earliest described philodendrons - Jacquin encountered it during his expedition to the West Indies in 1755-1759, and his description under the name Arum lacerum predates the formal establishment of the genus Philodendron. It was later also published under the synonyms Caladium lacerum, Philodendron albovaginatum and Philodendron incisocrenatum, all now included in a single species.
In Caribbean folk medicine, the leaves were applied to slow-healing wounds, while in the Philippines, where the plant has become naturalized, they were used externally for muscle aches and abdominal discomfort. Phytochemical studies have detected alkylresorcinols and alkylcatechols in the leaves - compounds studied in the context of contact dermatitis, which further supports caution when handling the plant's sap. In the English horticultural trade, the species is known as toothed philodendron.
Who this species is for
Philodendron lacerum is a choice for people who already have experience with climbing aroids - monsteras, pothos or more common philodendrons - and are looking for something rarer. It requires vertical space, consistently warm conditions and high humidity, but in return offers one of the most distinctive leaf shapes in the genus. It is suitable for collectors, hobby greenhouses and anywhere it can be provided with sturdy support and bright, indirect light. However, it is not a plant for cold stairwells, drafts or a windowsill in full sun.
Summary
Philodendron Lacerum is an evergreen climber from the humid forests of Cuba, Jamaica and Hispaniola, distinguished by large leaves up to 50 cm long with "ragged" margins that appear only on mature, climbing specimens. It grows moderately quickly and needs support, temperatures above 15 °C, an airy, humus-rich substrate and high humidity; in Europe, it is grown exclusively indoors. All parts of the plant are toxic if ingested. According to available sources, the species has not been the subject of a separate assessment in the IUCN Red List; within its natural range it is fairly common, while outside it is cultivated and has become naturalized locally.
