A Monstera looks like a big, leafy houseplant, but in nature it is a climbing vine that starts on the forest floor and works its way up tree trunks. Almost every part you see on yours, from the roots to the leaf joints, is equipment for climbing toward light. Even the famous holes are not damage or disease. The plant makes them on purpose, and only once it is big enough to need them.
Why Monstera Leaves Have Holes
The holes and splits are built in rather than torn. They form while the leaf is still tiny and rolled up, before it ever unfurls.1PubMed. Programmed cell death and leaf morphogenesis in Monstera obliqua (Araceae) At each future hole, a small cluster of cells is switched off and dies all at once, in a planned way.2PubMed. Programmed cell death and leaf morphogenesis in Monstera obliqua (Araceae) The cells right next to that cluster stay healthy and keep growing into normal leaf.3PubMed. Programmed cell death and leaf morphogenesis in Monstera obliqua (Araceae) A new leaf therefore already has its holes when it opens, and holes never appear later on a finished leaf.
One leading explanation for why the plant bothers is that holes let a bigger leaf spread across more of the scattered sunflecks on a forest floor without needing more leaf material.4PubMed. How did the swiss cheese plant get its holes? That makes the plant’s growth steadier from week to week instead of boom and bust, which helps it survive over time.5PubMed. How did the swiss cheese plant get its holes?
Holes usually appear only after the plant matures and starts producing larger leaves. More light and a support to climb generally bring mature leaves sooner, and a new solid leaf on an older plant can signal too little light.
Mature deliciosa leaves often show both deep splits that run out to the leaf edge and rows of rounded holes nearer the midrib. Adansonii leaves usually have holes inside the blade while the outer rim stays intact, so an unbroken edge is normal for that plant. Both patterns come from the same planned cell death.
Judge your plant by its newest leaves, because a leaf that opened solid will stay solid for its whole life. A smooth-edged hole that was there when the leaf unfurled is part of its design. Ragged brown edges or chewed spots appearing later on an older leaf are damage from pests, sunburn or dryness, which is a different problem. Cutting your own slits into a solid leaf only leaves wounds that turn brown.
Leaf Blade, Stalk and Sheath
Each leaf has a broad blade, a long stalk and a sheath at the base. The stalk has a thick waxy skin with a reinforced layer beneath it that keeps it stiff.6Bangladesh Journal of Botany. Anatomical adaptations of monstera deliciosa liebm.: A tropical liana It also holds the widest water-carrying tubes in the leaf, and the tubes get narrower out in the blade.7Bangladesh Journal of Botany. Anatomical adaptations of monstera deliciosa liebm.: A tropical liana The stalk is the main pipeline feeding a large leaf, which is why a damaged stalk usually means a failing leaf. Long, floppy stalks with small leaves suggest the plant needs brighter light.
The central midrib is the leaf’s backbone and main channel. Side veins run outward from it, and the holes sit between veins, never cutting through the midrib.
Each new leaf grows rolled up like a scroll inside the base of the previous leaf’s stalk, which wraps the stem as a protective sheath. When the new leaf is ready, it pushes out through the top of that wrap. Once it has unfurled, the papery sheath dries and turns brown. This is normal and does not mean the plant is unhealthy.
Resist the urge to pull a new leaf open, because the tissue is soft and tears easily. If you want to tidy up, wait until the sheath is completely dry and then trim it off.
The Leaf Joint That Turns Toward Light
Just below the leaf blade sits a swollen joint where the stalk can bend. The plant uses the leaf joint to reposition the leaf as conditions change.8The Planters’ Guild. Monstera Anatomy: Leaves, Roots, Geniculum When a large Monstera lit mainly from one window was turned around, its leaves rearranged over about two weeks and ended up less shaded.9The Planters’ Guild. Monstera Anatomy: Leaves, Roots, Geniculum The bending happened at these swollen joints even in leaves more than two years old.10The Planters’ Guild. Monstera Anatomy: Leaves, Roots, Geniculum
After you turn the pot, expect the leaves to reorient slowly over roughly two weeks, since the bending is gradual and not instant. Turning it a quarter at a time and giving the leaves time to adjust keeps growth even. Leaves tilted toward a window are healthy, not drooping.
A bend at the joint with a firm leaf is light-seeking. A soft, collapsing stalk is more likely from overwatering or rot, and whole-plant drooping with dry soil usually means thirst.
The Stem and Its Nodes
Monstera stems are built from many separate bundles of water and sugar tubes scattered through the stem, as in other aroid climbers.11American Journal of Botany. VASCULAR PATTERNS IN STEMS OF ARACEAE: SUBFAMILY MONSTEROIDEAE Unlike trees, Monstera has no growth layer that adds wood, so the stem cannot thicken much once formed.12The New Phytologist. Hydraulic architecture of Monstera acuminata: evolutionary consequences of the hemiepiphytic growth form
The key landmark on the stem is the node, the slightly swollen ring where a leaf attaches. Follow a leaf stalk down to the stem and you will find one. Nodes are also where aerial roots and dormant buds form, so a small brown nub next to a leaf scar is usually a root starting. In low light the stem stretches and the nodes sit farther apart, one visible sign the plant wants more light.
Nodes matter most for cuttings. A leaf or stalk alone can root but will not grow a new stem. Cut just below a node that has a root nub or bud, and roots or new growth will emerge from the node, not the cut end. One node with one leaf is the simplest successful cutting.
The stem is also meant to lean on a support rather than stand alone. A moss or coir pole lets roots grip and the stem grow upright, and supported plants tend to make larger, more mature leaves.
Aerial Roots and What They Do
Aerial roots grow from the stem nodes and are the plant’s climbing tools. In related aroid vines, roots grow fast at first, then slower, and grip more strongly the longer they stay attached.13PubMed Central. Diverse climbing strategies in aroid vines: functional adaptations and environmental drivers On smooth surfaces their tiny hairs flatten and release a sticky substance, while on rough bark they push into tiny cracks and lock in.14PubMed Central. Diverse climbing strategies in aroid vines: functional adaptations and environmental drivers A rough, slightly moist pole such as coir or moss therefore gives aerial roots far better grip than smooth plastic.
These roots can also switch jobs. They keep growing along much of their length, so they recover well from damage.15PubMed Central. Cellular Growth in Aerial Roots Differs From That in Typical Substrate Roots When they reach the ground, they convert into normal underground roots.16PubMed Central. Cellular Growth in Aerial Roots Differs From That in Typical Substrate Roots A long aerial root guided into the pot can become an extra feeding root. Pick one that is still flexible and bend it gently toward the soil, since stiff old roots can snap. Press its tip a little below the surface and keep that soil lightly moist, because the root needs damp conditions to convert.
Trimming a few unwanted aerial roots with clean shears will not harm a healthy plant. Removing many at once cuts into the plant’s grip and some of its water uptake, so take only a few at a time. Tucking roots into the soil or onto a pole is usually the better choice, because it puts them to work. Never cut the root nub on a node you plan to propagate, since that root gives the cutting a head start.
Firm brown or green roots are normal. Dry, shrivelled tips are common in low humidity and harmless. Mushy black roots point to rot and should be removed; if the roots in the pot are affected, check your watering too.
Needle Crystals and Monstera Toxicity
Monstera tissues contain tiny needle-shaped crystals of calcium oxalate.17University of Colorado Honors Journal. Effects of Sun vs Shade and Leaf Age on Leaf Morphology, Herbivory, and Physical Defenses in the Swiss Cheese Plant (Monstera adansonii) They act as a physical defence against animals that eat the plant.18University of Colorado Honors Journal. Effects of Sun vs Shade and Leaf Age on Leaf Morphology, Herbivory, and Physical Defenses in the Swiss Cheese Plant (Monstera adansonii) When a pet or child chews a leaf, the needles cause mouth pain, drooling and swelling.
If that happens, rinse the mouth with water and offer a drink, which helps wash away needle crystals still stuck in the tissue. Call a vet or poison helpline if swelling grows or trouble swallowing appears, since swelling in the throat is the serious risk. For pets that chew plants, keep the Monstera out of reach, such as on a high shelf or in a room they cannot enter. If your skin is sensitive, wear gloves when pruning large plants, and wash your hands before touching your eyes.
A mature Monstera deliciosa produces a long, scaly fruit that ripens with a burst of the ripening gas ethylene, like a banana.19Journal of Food Science. COMPOSITION AND PHYSIOLOGY OF Monstera deliciosa FRUIT AND JUICE Ripe fruit is sweet, and its juice is considered safe to consume in terms of its natural irritants.20Journal of Food Science. COMPOSITION AND PHYSIOLOGY OF Monstera deliciosa FRUIT AND JUICE Even ripe fruit still contains some oxalic acid, and unripe fruit is far more irritating. Indoor plants rarely flower or fruit, so fruit is mainly a concern for outdoor or very mature plants.
Why Monstera Leaves Drip Water
The dripping happens when roots keep absorbing water while the leaves lose little to the air.21Foliage Factory. Guttation: When Plants “Sweat” at Night It is most common overnight, when light drops, leaf pores close, humidity rises and the soil is still moist.22Foliage Factory. Guttation: When Plants “Sweat” at Night Pressure builds inside the water tubes and pushes fluid out through small pores at leaf edges and tips.23The Palm Centre. Secrets of the Sobbing Plants: Decoding the Drama of Weepy Houseplants
Occasional drops on leaf tips, especially in the morning after you have watered, are normal. Constant dripping while the soil stays wet for days suggests overwatering, since the roots are taking in more water than the plant uses. In that case, let the top few centimetres of soil dry before watering again. White crusty spots at leaf tips are dried minerals left when the droplets evaporated, and they can be wiped off.
The droplets can contain plant compounds, so wipe them off surfaces and keep pets from licking dripping leaves. A saucer or mat under the plant catches drips.