To answer whether you can put your peace lily (Spathiphyllum) outside, we must first consider its origins. Peace lilies are not true lilies but are tropical understory plants native to the rainforests of Central and South America. In their natural environment, they thrive on the forest floor beneath the dense canopy of taller trees. This means they are adapted to conditions of bright, indirect light, high humidity, consistent warmth, and protection from harsh, direct sunlight and strong winds. Their root systems are also accustomed to rich, well-draining organic matter that stays moderately moist but is never waterlogged.
Placing your peace lily outside during the summer months can be highly beneficial, mimicking its natural growing conditions more closely than the often dry, static air of a home interior. The increased humidity outdoors is a significant advantage, as peace lilies are humidity-loving plants. This can lead to larger, more vibrant leaves and more frequent blooms. Furthermore, natural rainfall can help flush minerals and salts from the soil that accumulate from tap water fertilization. The gentle movement of air can also strengthen the plant's stems and help discourage certain pests.
The key to a successful outdoor transition is meticulous placement. You must replicate the plant's preferred dappled light conditions. An ideal spot would be on a covered patio, under a dense tree that provides filtered sunlight, or on a north-facing side of your home. Direct afternoon sun will quickly scorch the leaves, causing brown, crispy tips and yellowing. Conversely, deep shade may stifle growth and prevent flowering. The location must also be sheltered from strong winds, which can tear the broad leaves and cause the plant to dry out rapidly.
Your care routine will need to change once the plant is outside. While rainfall will contribute to watering, you must remain vigilant. Check the soil moisture frequently, as outdoor conditions like wind and heat can cause the soil to dry out much faster than indoors. Water deeply when the top inch of soil feels dry. However, also ensure the pot has excellent drainage to prevent root rot during heavy summer downpours. You should temporarily cease fertilization or do it very sparingly, as the plant will be in an active growth phase and combined with strong natural light, over-fertilization can lead to fertilizer burn.
Plants experience shock from sudden environmental changes. Do not move your peace lily directly from your living room to the sunny garden. Acclimate it gradually over a week or two by first placing it in a deeply shaded, sheltered area for a few hours a day, slowly increasing its time outside and its exposure to brighter indirect light. Furthermore, remember that this is a summer vacation. You must bring the plant back indoors well before nighttime temperatures consistently drop below 55°F (13°C), as it is highly sensitive to cold and will suffer damage from even a light frost.
