What Are the Holes in Monstera Called? Fenestrations Explained

By Michael Chen · January 23, 2026

What Are the Holes in Monstera Called?

The holes in monstera leaves are called fenestrations. These natural perforations develop as the plant matures and are a key characteristic of species like Monstera deliciosa. Fenestrations help the plant maximize sunlight absorption in its native rainforest habitat by allowing light to pass through to lower leaves.

Understanding Monstera Fenestrations

Fenestrations are one of the most distinctive features of monstera plants. Unlike leaf damage or disease, these holes are a healthy, natural adaptation. They begin to appear as the plant ages, typically after the first year of growth under optimal conditions.

Why Do Monsteras Develop Fenestrations?

Light optimization: In dense tropical forests, fenestrations allow sunlight to penetrate deeper into the plant canopy.
Wind resistance: Slotted leaves reduce wind load, helping the plant withstand strong gusts.
Rainwater drainage: Holes enable water to pass through, reducing the risk of fungal growth and leaf rot.
Energy efficiency: By not filling in certain areas, the plant conserves resources while maintaining structural integrity.

Factors That Influence Fenestration Development

Not all monstera plants display prominent holes. Several environmental and biological factors affect fenestration formation:

Factor	Optimal Condition	Impact on Fenestrations
Light Exposure	6+ hours of bright, indirect light daily	Plants with less than 4 hours show 78% fewer fenestrations (Source: Royal Horticultural Society, 2023)
Plant Age	12+ months	Fenestrations rarely appear before 1 year; mature plants (>3 years) show full split patterns
Humidity	60–80%	Low humidity (<40%) reduces leaf size and delays fenestration onset by up to 6 months
Nutrient Availability	Balanced N-P-K fertilizer (20-20-20), monthly during growing season	Nitrogen-deficient plants produce smaller, solid leaves even with adequate light
Genetic Variability	M. deliciosa, M. adansonii	M. dubia and juvenile forms lack deep splits; genetics determine potential

Table data source:1, 2

The data shows that light and maturity are the two most influential factors in fenestration development. Even genetically predisposed plants fail to fenestrate without sufficient light. Humidity and nutrition play supportive roles in overall leaf health and size.

How to Encourage Fenestrations in Your Monstera

Provide Adequate Light

Place your monstera near an east- or south-facing window with filtered sunlight. Use sheer curtains to prevent scorching. Supplement with full-spectrum grow lights if natural light is insufficient.

Maintain Consistent Care

Water when the top 2–3 inches of soil are dry.
Fertilize monthly during spring and summer with a balanced liquid fertilizer.
Keep humidity above 60% using a humidifier or pebble tray.
Wipe leaves regularly to prevent dust buildup, which blocks light absorption.

Support Vertical Growth

Use a moss pole or trellis to encourage upward growth. As the plant climbs, it receives better air circulation and light exposure, both of which promote fenestration.

Common Misconceptions About Monstera Holes

Holes mean the plant is unhealthy: False — fenestrations are a sign of maturity and good health.
All monstera varieties have deep splits: Incorrect — some species like M. siltepecana have minimal fenestrations.
Holes appear immediately: No — young plants produce solid, heart-shaped leaves initially.
More holes = better care: Not necessarily — excessive splitting can indicate stress in rare cases.

Frequently Asked Questions About Monstera Fenestrations

Why are my monstera leaves not splitting?

Your monstera may be too young or receiving insufficient light. Plants under one year old rarely fenestrate. Ensure it gets at least 6 hours of bright, indirect light daily and consider using a grow light during winter months.

Do all monstera species develop holes?

No, not all species do. While Monstera deliciosa and M. adansonii are known for pronounced fenestrations, others like M. dubia or M. karstenianum have solid leaves even when mature.

Can I make my monstera fenestrate faster?

You can encourage earlier fenestrations by optimizing care: provide strong indirect light, use a moss pole for support, maintain high humidity (60–80%), and feed monthly during growing months with balanced fertilizer.

Are holes in monstera leaves the same as variegation?

No. Fenestrations are physical holes or splits in the leaf, while variegation refers to color variation (e.g., white or yellow patches) due to chlorophyll distribution. They are unrelated traits, though both are prized by collectors.

Should I prune non-fenestrated leaves?

Only if they’re damaged or diseased. Young, solid leaves are normal and contribute energy to the plant. Pruning them unnecessarily can slow growth and delay fenestration development.