What are those holes in my plant's leaves?

Scientists believe they help leaves withstand heavy rain and strong winds, allow sunlight to filter through to lower leaves, and may even improve air circulation around the plant.

The most recognizable example is the Monstera deliciosa, often called the Swiss cheese plant. Young Monstera leaves usually emerge as solid, heart-shaped leaves, but as the plant matures and receives the right combination of light, humidity, and support for climbing, the iconic splits and holes begin to appear. Mature specimens growing up a moss pole or tree can produce dramatically fenestrated leaves that are much larger than those grown without support.

Philodendrons also showcase impressive fenestration, although the pattern varies by species. Plants like Philodendron bipennifolium develop deeply lobed leaves, while climbing species such as Philodendron florida beauty combine striking variegation with dramatic leaf divisions. Another standout is Philodendron tortum, whose narrow, skeletal-looking leaves almost resemble delicate palm fronds. Each species demonstrates that fenestration can take many different forms, from subtle cuts to elaborate, lace-like foliage.

If you're hoping to encourage fenestration in your own plants, patience is just as important as care. Bright, indirect light, consistent watering, adequate humidity, and something sturdy to climb all play a role in helping many aroids reach maturity. A small Monstera or Philodendron grown in dim conditions is unlikely to produce highly divided leaves, even if it's otherwise healthy. Giving the plant an environment that mimics its natural habitat allows it to develop the dramatic foliage it's known for.

Leaf fenestration is a perfect reminder that plants are both beautiful and incredibly adaptable. What looks like artistic decoration is actually the result of millions of years of evolution. Whether it's the bold perforations of a Monstera or the elegant divisions found on certain Philodendrons, these unique leaves continue to fascinate plant enthusiasts and make tropical houseplants some of the most eye-catching additions to any indoor collection.