Air-purifying plants and spring allergies: what to know

Living in a healthy home environment is important for everyday well-being, especially for people who suffer from seasonal allergies or are sensitive to pollutants. Air-purifying plants are called that because some laboratory studies have measured their ability to absorb volatile organic compounds (VOCs), but in a real home their effect on air quality is modest: they do not replace air exchange or allergy treatment. They remain plants that decorate and enliven spaces and are part of a well-kept home.

To improve the air in your home, air exchange and ventilation matter most: air out rooms regularly, use the range hood in the kitchen, and limit smoke and products that release volatile substances. For allergies, consult a doctor. Plants complement these habits as decorative, wellness-boosting elements, chosen according to the light and the time you can devote to their care.

If you want to bring more greenery into your home, explore our collection of indoor plants: you'll find species suited to every corner of your home, adding a touch of natural beauty.

What are air-purifying plants, and what does the NASA study say?

Air-purifying plants are plant species often cited for their ability to improve indoor air quality. A 1989 NASA study, the Clean Air Study, measured the absorption of volatile organic compounds (VOCs) such as formaldehyde, benzene, trichloroethylene, xylene, and ammonia by certain plants in small, sealed laboratory chambers without air exchange, not in an apartment; in a real home, where air is constantly exchanged, the effect of a few plants is much smaller. These pollutants are often released by furniture, paint, cleaning products, synthetic fabrics, and cigarette smoke, contributing to what is known as “sick building syndrome.”

In laboratory settings, leaves absorb small amounts of gas through their stomata, the tiny openings on their surface, and microorganisms in the soil break some of it down. Through photosynthesis, plants also absorb carbon dioxide and release oxygen during the day. These are real processes, but in an occupied space the amounts involved are small compared with how much air in a home is exchanged with the outdoors when you air it out.

That’s why it’s more accurate to think of plants as a decorative and wellness feature rather than a filtration system: the air in your home is improved primarily through air exchange and ventilation. The Spathiphyllum and snake plant (Dracaena trifasciata) remain excellent choices for bringing greenery into your home, even if you have little experience.

In short, air-purifying plants are real plants that decorate and contribute to a well-kept space, but they are no substitute for open windows, ventilation, and cleaning to keep the air in your home healthier.

Plants and allergies: what to really expect

For people with allergies, plants are not a treatment and do not measurably reduce pollen indoors: they make a space more pleasant, but must be chosen and cared for carefully, because their leaves also collect dust and constantly damp soil can encourage mold. For symptoms, your doctor remains the best point of reference.

For allergy sufferers, spring can turn into a real nightmare, with sneezing, watery eyes, and breathing difficulties caused by pollen. But throughout the rest of the year, dust mites, pet dander, and mold can also trigger allergic reactions. Air-purifying plants for allergy sufferers are not a shield against these allergens: they can be part of a well-maintained home, alongside more important measures such as airing rooms, cleaning surfaces often, and following your doctor's advice.

Plants release water vapor through transpiration, but in a typical room, a few pots cause only a small increase in humidity. If the air is too dry, for example when the heating is on, a humidifier is more effective than plants; excessive humidity, on the other hand, can encourage dust mites and mold.

Leaves trap some of the dust and pollen that settle on their surface, just like any other object in the house. That's why they should be cleaned regularly with a damp cloth; otherwise, dust remains indoors. Rather than choosing them as indoor plants against pollen, choose them for their beauty and care for them consistently.

Be careful, though, with mold, an important allergen: constantly wet soil and saucers full of water can encourage it. If you have a mold allergy, avoid standing water, check the soil surface, and ask your doctor whether you should keep plants in your bedroom.

The most frequently cited air-purifying plants: features and care

The plants most often cited as air purifiers are Spathiphyllum, Sansevieria, Areca Palm, Pothos, and Ficus Benjamina. Spathiphyllum and Pothos are easy to care for, and Sansevieria is very hardy, while Areca Palm and Ficus Benjamina need moderate care and are suitable for living rooms and large, bright spaces.

Of the plants we grow, these five are the ones that appear most often on lists of air-purifying plants. Below, you'll find what makes them stand out as ornamental plants and what they need to thrive.

Spathiphyllum: Elegance and Blooms

Spathiphyllum, also known as the Peace Lily, is one of the plants in NASA's study, which measured its absorption of certain VOCs, such as benzene and formaldehyde, in a laboratory. At home, it is chosen mainly for its glossy leaves and elegant white flowers, which make it a pleasing addition to any room. It is toxic to dogs and cats (source: ASPCA): keep it out of their reach. It needs little direct light and consistently moist, but not waterlogged, soil. It is a hardy, relatively easy-care plant, perfect for beginners too.

Sansevieria: The Queen of Resilience

The Sansevieria, or snake plant, is a very hardy plant, ideal for anyone who doesn’t have a green thumb. Like other plants with CAM metabolism, it absorbs carbon dioxide mainly at night; however, its effect on the air in a room is negligible. Its upright shape makes it perfect for tight spaces, and it needs very little water, tolerating dry spells well. It does well in bedrooms and offices, even in low light, and requires almost no maintenance. It is toxic to dogs and cats (source: ASPCA).

Areca Palm: A Tropical Touch

The Areca Palm (Dypsis lutescens) is an elegant indoor palm with broad fronds that add a tropical touch to any room, making it a popular choice for living rooms and spacious areas. Like all plants, it releases some water vapor through transpiration, but it is not a substitute for a humidifier. It needs bright but indirect light and consistently moist soil. It is non-toxic to dogs and cats (source: ASPCA).

Pothos (Epipremnum aureum): Versatile and Easy to Care For

Pothos is an extremely versatile, easy-care climbing plant, often listed among air-purifying plants. It is one of the most tolerant plants when it comes to light and watering conditions, making it suitable even for beginners. Its heart-shaped, often variegated leaves make it a charming decorative feature, whether hanging or placed on shelves. Pothos is one of the most popular and widely appreciated indoor plants, and its rapid growth makes it an excellent choice for filling spaces with greenery in no time. All parts of the plant are toxic if ingested, including to dogs and cats (source: ASPCA): keep it out of reach of children and pets.

Ficus Benjamina: A Statement Plant for Large Spaces

Ficus benjamina, with its glossy leaves and shrubby shape, is an excellent choice for decorating larger rooms and is often listed among air-purifying plants. It is a little more demanding to care for than other plants. It needs bright, indirect light and regular watering. Keep in mind that ficus can be sensitive to changes in its surroundings, so once you find the ideal spot for it, it’s best not to move it. It’s a good fit for anyone with space who wants a visually striking plant.

How to Position Plants in Your Home, Room by Room

Every plant needs the right spot: Sansevieria and Spathiphyllum in the bedroom, Areca Palm and Ficus Benjamina in bright living room corners, Pothos and Spathiphyllum in the kitchen and bathroom, and Sansevieria and Pothos in the office. Always choose spots with indirect light, protected from direct sunlight and drafts.

Knowing how to position plants in your home matters as much as choosing the species: each room has its own light, temperature, and humidity, and a plant in the right spot will grow well and stay attractive longer. When it comes to air quality, however, ventilation and fresh air make the difference, not where you place the pots.

Bedroom: Discreet, Easy-Care Plants

For the bedroom, choose discreet, easy-care plants such as Sansevieria, which tolerates low light and needs little water, and Spathiphyllum. Don’t expect plants to make the air cleaner or help you sleep better: airing out the room is what matters most for bedroom air quality. If you have allergies, avoid constantly wet potting soil, which can encourage mold, and don’t place pots too close to the bed.

Living Room: The Heart of the Home

The living room is often the largest and most frequently used room in the home. It can accommodate larger plants, such as the Areca Palm or Ficus Benjamina, whose lush foliage fills empty corners and adds character to the space. Place them in bright corners, protected from direct sunlight and drafts. Grouping plants of different sizes creates a striking visual impact.

Kitchen: Lighting and Shelves

In the kitchen, cooking fumes and odors are cleared by using the range hood and opening the window, not by plants. Plants such as Pothos or the Peace Lily are still excellent choices for bringing greenery into the kitchen. Pothos, being a climbing plant, can be hung up or placed on shelves, away from the stove but somewhere it can receive enough light.

Bathroom: Humidity and Light

The bathroom is the most humid room in the house, often with poor ventilation, which can encourage mold growth: to prevent it, airing out the room after a shower is especially important. If there is a window, moisture-loving plants do well there. The Peace Lily is perfect for the bathroom, as is Pothos. Place them where they can benefit from indirect light and humidity, perhaps on a shelf or near the window. Their presence will add a fresh touch to the space.

Office or Study: Greenery on Your Desk

In an office or study, a plant on a desk or shelf makes the space more welcoming. The Snake Plant is an excellent choice for a desk, thanks to its resilience even in low light. Pothos can also be placed on a shelf or hung up. Make sure the plants do not obstruct walkways or views and receive the right amount of light, even if indirect. For air quality, ventilation and air circulation are what matter most, even in an office.

Caring for and Maintaining Air-Purifying Plants

Air-purifying plants stay healthy and beautiful when they receive indirect or filtered light, thorough watering followed by letting the soil partially dry out, adequate ambient humidity, and a balanced liquid fertilizer every 2-4 weeks in spring and summer. The leaves should be wiped regularly with a damp cloth to remove accumulated dust.

For your air-purifying plants to grow healthily and stay beautiful for a long time, it is essential to give them the right care and maintenance. Even the most resilient plants need specific attention to thrive. Here are practical tips from our nursery staff to ensure your plants enjoy a long and healthy life.

Light: Vital Energy

Light is the most important factor for photosynthesis and, consequently, plant health. Most indoor air-purifying plants prefer indirect or filtered light. Direct sunlight, especially during the hottest hours, can burn the leaves and stress the plant. Take a close look at your surroundings: if a room is too dark, you may need to choose more shade-tolerant plants, such as the Snake Plant, or consider using artificial grow lights. Conversely, if a plant gets too little light, its leaves may turn yellow or its growth may slow, weakening the plant.

Water: The Right Balance

Watering is an art that takes practice and attention. There is no universal rule, since water requirements vary considerably between species. In general, it is best to water thoroughly and then let the soil dry out partially between waterings. Constantly soggy soil can lead to root rot, while soil that is too dry can cause water stress. A good method is to check the soil moisture by inserting a finger about 2-3 cm deep: if it feels dry, it's time to water. Make sure the pots have drainage holes to prevent water from pooling. I Giardini di Giulia recommends using room-temperature water and, if possible, letting it sit to reduce chlorine.

Humidity: An Often-Overlooked Factor

Many indoor plants, such as Spathiphyllum and Areca Palm, come from tropical climates and appreciate high humidity. Dry air in heated or air-conditioned rooms can cause leaf tips to dry out and reduce plant vitality. To increase humidity, you can regularly mist the leaves with distilled water, place the pots on a tray of damp expanded clay, or use a humidifier. This not only promotes plant health, but also helps create a more comfortable environment for you, especially if you suffer from allergies.

Fertilizing: Nourishing Plants for Growth

Air-purifying plants, like all plants, need nutrients to grow and maintain their vitality. During the growing season (spring and summer), fertilize your plants every 2-4 weeks with a balanced liquid fertilizer, following the manufacturer's instructions. Reduce the frequency in fall and winter, when growth slows. A well-nourished plant is stronger and more beautiful, and balanced fertilization helps keep plants lush and long-lived.

Leaf Cleaning: Healthy, Shiny Leaves

Leaves are the surface through which a plant breathes and captures light: the stomata, the tiny openings on the leaf blade, work best when they are not covered. Dust and pollen that settle on leaves, if not removed, form a layer that hinders gas exchange and photosynthesis and weakens the plant.

To clean them, gently wipe both sides of each leaf with a soft cloth dampened with room-temperature water, supporting it with your other hand. Do this regularly, especially in spring, when pollen is more abundant: particles trapped by the leaves need to be removed, otherwise they remain in the home. For Spathiphyllum and Areca Palm, which love humidity, you can finish cleaning by misting them with distilled water.

Mistakes to Avoid with Air-Purifying Plants

The most common mistakes with air-purifying plants are almost always the same: relying on plants alone for clean air, exposing them to direct sunlight, overwatering or using pots without drainage, neglecting dry air and dust on the leaves, moving them constantly, and forgetting about the safety of children and pets.

• Relying on plants alone for clean air — Plants don’t replace ventilation: air out rooms every day and use the range hood in the kitchen.
• Direct sunlight — During the hottest hours, it burns leaves and stresses the plant: almost all air-purifying species prefer indirect or filtered light.
• Too much water and pots without drainage holes — Soil that’s constantly waterlogged causes root rot. Use pots with drainage holes and water only when the top 2-3 cm of soil is dry.
• Dusty leaves — Accumulated dust and pollen weaken the plant and remain in the home: clean the leaves regularly with a damp cloth.
• Air that’s too dry — In heated or air-conditioned rooms, leaf tips dry out. A tray of damp expanded clay pebbles or a humidifier can help both the plant and anyone with allergies.
• Moving the plant constantly — Ficus benjamina is particularly sensitive to changes: once you’ve found the right spot, leave it there.
• Toxic plants within reach of children and pets — Spathiphyllum and Pothos are toxic if ingested: place them on high shelves or in hanging baskets.
• Fertilizing in winter as in summer — Growth slows in fall and winter, so reduce fertilizing.

Choosing the Right Plants with Giulia’s Gardens

To choose the right air-purifying plant, start with three questions: how much light the room gets, how much time you can devote to care, and who lives in your home. Your answers will point you to the most suitable species described in this guide and the number of plants to place in the rooms you use most.

• Little time or dimly lit rooms — Sansevieria and Pothos: they tolerate different light conditions and forgive the occasional missed watering.
• Dry air — Spathiphyllum and Areca Palm, which like humidity: if the air is very dry, place a humidifier nearby.
• Bedroom — Sansevieria, which tolerates low light, and Spathiphyllum.
• Large, bright living rooms — Areca Palm and Ficus benjamina, which need moderate care but have large leaf surfaces.
• Children or pets at home — Find out how toxic each species is and keep plants out of reach, on high shelves or in hanging baskets.

In the comparison table above, you’ll find each plant’s characteristics, care level, and ideal placement: use it as a reminder when choosing plants for each room.

Frequently Asked Questions