The most effective ways to encourage bigger leaves on houseplants are providing adequate light, ensuring the plant has appropriate support to climb (for climbing species), maintaining consistent moisture and nutrients during the growing season, and choosing the right pot size.
Leaf size is primarily determined by the plant's available energy (light) and whether it has received the growth triggers that unlock adult foliage. For climbing aroids like Monsteras, the trigger is vertical support and aerial root attachment. Increasing light and providing the right support typically produce the most dramatic increases in leaf size in the shortest time.
Light Is the Primary Driver of Leaf Size
Plants produce larger leaves when they have more energy available from photosynthesis. In higher light, more energy is available for leaf development, and the plant produces larger, more fully-formed leaves. In lower light, the plant produces smaller leaves (or in extreme cases, no new leaves at all) to conserve resources.
For most tropical houseplants, moving from a medium indirect to a bright indirect position produces a noticeable increase in leaf size within a growing season. The improvement is most dramatic in fast-growing plants, which can increase leaf size substantially in response to a light improvement. See our guide on what bright indirect light means for practical guidance on optimising your plant's light position.
Vertical Support for Climbing Aroids
For Monsteras, Rhaphidophoras, split-leaf Philodendrons, and climbing Epipremnum varieties, the most dramatic leaf size increase comes from providing a moss pole or climbing board and training the plant to grow upward. These plants have two distinct growth phases: a juvenile trailing phase with small, undeveloped leaves, and an adult climbing phase with large, fenestrated, fully-developed foliage. The adult phase is only activated when the plant is climbing vertically and attaching its aerial roots to a support.
A Monstera deliciosa trailing along a shelf produces leaves that may never develop fenestrations (holes and splits). The same plant trained up a damp Kratiste Support Pole with its aerial roots in contact with the moss will begin producing significantly larger, fully-developed adult leaves within one growing season. See our guide on how to train climbing houseplants for the full process.
Nutrients and Watering Consistency
Consistent watering and regular feeding during the growing season provide the building blocks for larger leaves. A plant that is drought-stressed or nutrient-deficient cannot produce maximum-sized leaves regardless of light. Feed with a balanced fertiliser every two to four weeks from March through September. This will provide a reliable range of nutrients for the growing season without the burn risk of concentrated synthetic feeds. See our fertilising guide at when to fertilise houseplants.
Correct Pot Size and Root Health
A plant that is severely rootbound redirects energy into root development rather than leaf growth, and has limited access to nutrients in a compacted root mass. Repotting into a slightly larger pot with fresh compost provides fresh nutrient resources and space for root expansion, which supports larger leaf production in the following growing season.