Why Your Monstera Isn't Developing Splits and Holes

A Monstera deliciosa that never develops the deep splits and holes (fenestrations) its owners bought it for is one of the most common sources of disappointment among people growing this particular plant, mostly because the marketing around Monstera leans so heavily on mature, dramatically fenestrated leaves that it's easy to assume every leaf on every plant should look that way from the start. It shouldn't, and understanding why fenestration actually develops clears up most of the confusion.

Fenestration is a function of age and light, not a fixed trait

A young Monstera, regardless of how healthy it is, produces solid, unfenestrated (or barely fenestrated) heart-shaped leaves for its first one to two years of growth. This isn't a sign of a problem — it's the plant's normal juvenile growth stage, and the same pattern shows up reliably across cuttings, nursery starts, and seed-grown plants alike. Real fenestration develops progressively as the plant matures, with each successive leaf typically showing more splits and holes than the last, assuming the plant is otherwise healthy and getting adequate light.

Light is the second major factor, and it's the one people most often get wrong. In the wild, Monstera deliciosa climbs tree trunks toward the forest canopy, and its fenestrations are understood to serve a functional purpose in that environment — allowing dappled light to reach lower leaves and reducing wind resistance and rain damage on a very large leaf surface. Indoors, a Monstera kept in genuinely low light has little biological reason to prioritize the energy-expensive process of forming complex splits, and tends to produce smaller, plainer, less fenestrated leaves even once it's old enough that fenestration should otherwise be appearing. Moving a struggling-to-fenestrate Monstera to meaningfully brighter indirect light is the single most effective intervention available, more reliable than any fertilizer or soil change.

Climbing structure matters more than most owners expect

Monstera deliciosa is naturally a climbing aroid, using aerial roots to attach to a support and grow upward rather than sprawling as a houseplant habit alone. A Monstera without a moss pole, trellis, or other vertical support to climb often puts out smaller leaves with less fenestration than a genetically identical plant given something to climb, because the plant's growth hormones respond to the physical act of climbing — a phenomenon plant growers sometimes call thigmomorphogenesis, where mechanical stimulation from contact with a support structure influences growth patterns. Giving even a young Monstera a moss pole or stake early, before it strictly needs the physical support, tends to produce larger, more fenestrated leaves sooner than letting it grow unsupported.

Node count and leaf progression

For an already-mature Monstera that still isn't fenestrating, it's worth counting how many leaf nodes back you'd have to go to find the plant's last genuinely new leaf. A plant that's stalled in growth — not pushing new leaves at all due to being rootbound, underfed, or underlit — obviously won't show fenestration progress simply because it isn't producing new leaves to show it. In that case the real problem is the growth stall itself, covered in our not growing causes guide, rather than a specific fenestration issue distinct from general growth.

Fertilizing's real but limited role

Adequate nutrition supports the energy-intensive process of producing large, fenestrated leaves, and a Monstera on a consistent, appropriately diluted fertilizing schedule during its growing season generally produces more vigorous growth than a chronically underfed one. But fertilizer is not a fenestration shortcut on its own — an already well-lit, well-supported, healthy Monstera that isn't yet fenestrating due to genuine youth won't be pushed into premature fenestration by heavier feeding, and over-fertilizing risks salt buildup and root damage that actively works against healthy growth. Our fertilizing houseplants guide covers appropriate dilution and seasonal timing in more depth.

What actually causes leaves with holes but no fenestration pattern

It's worth distinguishing genuine fenestration — the plant's own deliberate splits along predictable lines radiating from the leaf's midrib — from irregular holes or tears caused by physical damage, pests, or disease, which can superficially look similar to an inexperienced eye but appear at random locations rather than following the leaf's natural venation pattern. Ragged, irregularly shaped holes, especially paired with other symptoms like stippling or webbing, point toward pest damage (see our spider mites guide) rather than genuine developmental fenestration, and won't resolve or improve the way true fenestration progresses with each new leaf.

Fenestration looks different across Monstera species

It's worth noting that "fenestration" doesn't mean the same visual pattern across every Monstera species people commonly grow, which causes some cross-species confusion. Monstera deliciosa produces the classic large splits radiating outward from the leaf's midrib on a broad, heart-shaped leaf, while Monstera adansonii (commonly sold as Swiss cheese vine) develops numerous rounded holes scattered across a narrower, more elongated leaf, a genuinely different fenestration pattern driven by a different leaf structure rather than simply a smaller version of deliciosa's pattern. Monstera Thai Constellation, a variegated deliciosa cultivar, follows the same splitting pattern as standard deliciosa but often fenestrates somewhat more slowly and unpredictably, since the white variegated sections of its leaves contain no chlorophyll and contribute no photosynthetic energy toward the plant's growth, effectively giving the plant less total energy-producing leaf surface than an equivalently sized all-green deliciosa. If you're comparing fenestration progress against photos of a different Monstera species or cultivar than the one you actually own, that comparison may not be a fair or useful benchmark.

Watering's indirect connection to fenestration

Watering doesn't influence fenestration directly the way light and climbing support do, but chronic over- or under-watering stresses the plant enough to slow or stall new leaf production altogether, which indirectly stalls fenestration progress simply because there's no new growth to show it. A Monstera cycling between drought stress and soggy soil is spending its available energy on basic survival and root maintenance rather than on producing new, larger, more fenestrated leaves, so resolving an underlying watering inconsistency — covered in our overwatering signs and fixes guide — is sometimes the real first step for a plant that seems stuck at the same immature leaf size and pattern for an unusually long stretch.

Realistic expectations by age

A cutting or young plant in its first year typically shows minimal to no fenestration. By the second year, with adequate bright indirect light and a climbing support, most Monsteras begin showing partial splits on new leaves. Full, dramatic fenestration with numerous holes as well as splits typically doesn't appear until a plant is several years old and has reached a larger overall size — the enormous, heavily fenestrated leaves seen on mature specimens in botanical collections or well-established older houseplants represent years of consistent growth under strong light, not something achievable within a plant's first year regardless of care quality. Our Monstera hub covers the plant's complete care profile and documented problems, including the specific case of no fenestrations with a full troubleshooting breakdown for plants old enough that fenestration should reasonably be expected but isn't appearing.