Monstera Not Developing Holes (Fenestrations) — The Real Reasons
Monstera (Monstera deliciosa)
Symptoms
- no holes in leaves
- solid leaves
- no fenestrations
- leaves without splits
- new leaves without holes
- small leaves
- leaves that are large but still fully solid
- fenestrations that stopped appearing on newer leaves after previously showing them
Causes
Plant is too young
This is the most common and most misunderstood cause. Monstera deliciosa does not produce fenestrated leaves until it reaches a certain level of maturity, regardless of care quality. Young plants sold in small pots often have solid, heart-shaped juvenile leaves — this is normal and developmental, not a care failure. As the plant ages and produces larger leaves, fenestrations appear naturally. A plant in a four-inch pot producing small solid leaves is almost certainly just a juvenile specimen. As a rough guide, most Monstera deliciosa don't begin showing any fenestration until they've produced roughly ten to thirteen leaves, and don't show the deep, complex splits associated with mature specimens until considerably later than that.
Insufficient light
Light is the primary environmental trigger for fenestration in mature plants. The leading hypothesis among botanists is that holes in Monstera leaves evolved to allow lower leaves and parts of the same leaf to receive light that would otherwise be blocked — an adaptation that makes sense in a forest canopy environment. Indoors, insufficient light is the most fixable cause of non-fenestrated leaves on a plant old enough to produce holes. A Monstera producing solid leaves in a dim corner will typically begin fenestrating when moved to a brighter location.
Not climbing or supported vertically
In nature, Monstera produces its largest, most deeply fenestrated leaves when climbing. Research has shown that climbing Monstera specimens produce significantly larger leaves with more complex fenestration than the same plant trailing or growing horizontally. A moss pole or other vertical support encourages this mature, climbing growth habit and can trigger more dramatic leaf development.
Nutritional deficiency
A plant depleted of key nutrients — particularly nitrogen and potassium — produces smaller, less developed leaves. While deficiency alone won't prevent fenestration in a mature, well-lit plant, it can reduce the size and complexity of fenestrations when combined with other limiting factors.
A regression after a stressful event
A mature Monstera that has previously produced fenestrated leaves can temporarily revert to producing smaller, less-fenestrated, or entirely solid leaves after a significant stress event — a hard pruning, a major repot, a pest infestation, or a period of drought. The plant is essentially reallocating limited energy toward basic recovery rather than toward the more resource-intensive large fenestrated leaf structure, and normal fenestration typically resumes within two to four leaf cycles once the plant has stabilized.
How to Fix It
- 1
First, assess your plant's age and size. If it has fewer than five or six leaves total, or if all its leaves are smaller than six inches, it is likely a juvenile plant and no intervention will produce fenestrations — patience is the only answer.
- 2
Relocate the plant to the brightest indirect spot the room offers — a sheer-curtained south or west exposure it can sit close to, or an unobstructed north-facing window with nothing blocking the sky view. A lux meter app gives a real number to work from; Monstera fenestration is favored in the 2,000-5,000 lux range rather than the dim 200-500 lux many rooms deliver a few feet back from any window.
- 3
Install a moss pole or totem and train the aerial roots to attach to it. As the plant climbs and grows upward rather than outward, the leaves that emerge tend to be larger and more fenestrated. Train new growth stems against the pole with soft plant ties while they're flexible.
- 4
Resume or begin a monthly fertilizing schedule during the growing season (spring through early autumn) with a balanced liquid fertilizer. This ensures nutritional resources are available when the plant produces new, potentially fenestrated leaves.
- 5
If fenestrations disappeared after a specific stressful event (hard pruning, major repot, pest treatment, a dry spell), focus on stable, consistent basic care — light, water, humidity — for the next couple of months rather than making further changes. Fenestration typically returns within two to four new leaves once the plant has fully recovered and resumed steady growth.
- 6
Keep a simple log of leaf count and fenestration progress (a phone photo dated each time a new leaf fully opens works well) — because fenestration development is gradual over months, it's easy to feel like nothing is changing when in fact each new leaf is measurably larger or more split than the last.
Prevention
- Purchase Monstera from a reputable seller with a plant that has already begun to show at least some fenestration on its larger leaves, confirming it's past the juvenile stage
- Provide a vertical growing surface (moss pole, coir totem) from early in the plant's life to encourage climbing behavior
- Maintain bright indirect light throughout the year, not just in summer
- Fertilize consistently during the growing season to support robust leaf development
- Avoid major stress events (hard pruning, repotting, and pest treatment all at once) stacked closely together, since the plant's fenestration development is one of the first things it deprioritizes under combined stress
- Be patient through the slower winter growth season — fenestration progress naturally pauses when overall growth slows, and resumes once spring light and warmth return
Normal vs. When to Worry
Normal: a young plant with fewer than ten to thirteen leaves producing solid heart-shaped leaves, or a previously fenestrating mature plant producing one or two smaller, less-split leaves after a stressful event before resuming normal fenestration. Worry: a plant well past its juvenile stage (well over a dozen mature-sized leaves) that has never once shown fenestration despite good light, or fenestration that keeps getting smaller over many consecutive leaves rather than recovering — these suggest a persistent limiting factor (usually light or nutrition) that needs to be corrected rather than simply waited out.
Quick Summary
| Plant Situation | Likely Cause | Fix |
|---|---|---|
| Under ~10-13 leaves total, small solid leaves | Juvenile plant, too young for fenestration | No fix needed — patience as it matures |
| Mature plant, dim location | Insufficient light | Move to brighter indirect light |
| Mature plant, no support to climb | Growing horizontally, not climbing | Install moss pole/trellis |
| Small, thin leaves despite good light | Nutrient deficiency | Resume monthly balanced fertilizing |
| Fenestration stopped after pruning/repot/pests | Temporary stress-recovery regression | Stabilize basic care; expect recovery in 2-4 leaves |