Summer is the growing season, and it's tempting to think "moving them outside will do them good" — but it's actually the trickiest season for choosing where a houseplant should live. Direct sun through a window is stronger than you'd expect, and air conditioning adds a double punch of dry air. It's the season when "I looked over and the leaves were scorched / the tips turned brown / leaves dropped" complaints spike.
This article covers the basics of summer placement, the most common failure patterns, sun tolerance by species, and how placement interacts with watering.
In summer, light and airflow make or break your plants
There are three main factors to watch in summer placement.
- Intensity of direct sun: several times the light of spring, with far more UV
- Dry air: air conditioning can push humidity down into the 30% range
- Temperature swings: jumps between outdoors and indoors, day and night
To cope with all this, the basic rule for summer is to plan on shifting plants a little from their spring positions. "It did fine here until spring, so summer should be the same" is the single most common way things go wrong.
Direct sun is more dangerous than it looks (how leaf scorch happens)
Summer sun is simply too much stimulation for most houseplants. Leaf temperature can hit 40-50°C (104-122°F) in a short time, destroying the chloroplasts and causing leaf scorch.
Signs of leaf scorch
- Whitish or brown patches appear on the leaves
- Leaf edges dry out and turn crispy
- Scorched areas never recover
- Damage gradually spreads out from the center
Leaf scorch most often happens after a sudden jump in light — for example, right after moving a plant outside that spent spring behind a sheer curtain, or right after shifting one from a dim corner to a sunny windowsill.
Species prone to scorch: Monstera, Ficus, Calathea, maidenhair fern, Philodendron Relatively tolerant species: snake plant, Yucca, succulents, Ficus microcarpa (ginseng ficus)
For what to do after scorch has happened, see why houseplant leaf tips turn brown and how to fix it.
The best spot: a window with a sheer curtain
The default summer position for houseplants is an east- to south-facing window behind a sheer curtain.
- East-facing window: gentle direct light in the morning, bright shade in the afternoon. Ideal for most houseplants
- South-facing window: bright all day, but a sheer curtain is a must at midday in high summer
- West-facing window: harsh late-afternoon sun — avoid in summer, or use a heavier curtain
- North-facing window: no direct sun, so it's safe in summer, but a bit short on light
"Bright but not direct" is the easiest light to grow in. Just drawing a sheer curtain cuts light by 30-50%, which dramatically lowers the risk of scorch.
If you move plants to a balcony or outdoors
Putting plants outside for the summer can help them or hurt them. If you do it, keep these points in mind.
- Acclimate gradually: don't drop them straight into strong sun. Keep them in shade for the first few days, then increase light slowly
- Partial shade at midday in high summer: avoid direct sun from noon to 3pm. Use a shade screen, an eave, or other pots to create shade
- Watch for heavy rain and wind: a sudden downpour can wash out the soil or tear leaves
- Expect pests: spider mites, aphids, and fungus gnats latch on easily outdoors. Check leaf undersides before bringing plants back in
- Nighttime temperature drops: rainforest natives (Monstera, Ficus, etc.) weaken when nights stay below 20°C (68°F)
For some species, the honest answer is that "indoors is safer than outdoors." Snake plants, Yucca, and succulents do well outside; Calathea, ferns, and Monstera are better kept indoors.
Air conditioning and your houseplants
Summer AC creates two problems for houseplants.
- Direct drafts dry out the leaves: leaf tips turn crispy and brown
- Lower room humidity: overall water loss through the leaves increases
Basic placement rules
- Avoid the spot directly below the AC vent, and anywhere within 2m (6 feet) of the airflow
- Angle the vents upward or sideways so air never blows straight at the plant
- Keep a hygrometer nearby and aim for 50% humidity or higher
- Mist 2-3 times a week (especially for humidity-loving species)
Running a humidifier helps too. An air-conditioned room often sits in the 30% humidity range — desert conditions, as far as a houseplant is concerned.
Sun tolerance by species
Knowing each species' sun tolerance takes most of the guesswork out of summer placement.
Handles strong sun (fine outdoors)
- Snake plant → complete care guide
- Yucca
- Money tree (Pachira) → complete care guide
- Aloe and other succulents
- Ficus microcarpa (ginseng ficus) → complete care guide
Moderate (sheer-curtain light is ideal)
- Monstera
- Pothos
- Ficus in general
- Dracaena
Sensitive to direct sun (bright shade)
- Maidenhair fern / ferns
- Calathea
- Aglaonema
- Anthurium
Even if you think "my Monstera has always been fine at the window," the sun from late June onward is a different beast from spring. If scorch starts to appear, draw a sheer curtain or move the plant back from the window right away.
Balancing placement with summer watering
Placement and watering go hand in hand. Move a plant somewhere brighter and it will start asking for more water than before.
- Windowsill / outdoors: soil dries faster → increase watering frequency by 1.3-1.5x
- Air-conditioned room: more transpiration means soil dries faster, but roots can also get too cold. Judge by the state of the soil
- Rainy, humid stretches: high humidity keeps soil wet longer → water a little less
- Peak of summer: water in the cool of early morning or evening (midday watering overheats the soil)
For overwatering specifically, see 5 signs you're overwatering your houseplants. Summer heat and moisture also make root rot more likely, so get in the habit of emptying the saucer right after watering.
Summer is also when houseplants grow the most — new leaves unfurl one after another and the whole plant sizes up. Keep light, airflow, and water in balance, and enjoy watching them take off.