Indoor Plants for Hanging Around

Indoor hanging plants seem to come and go in style. Unfortunately, many people lose interest in them because they become bored with little more than green fronds hanging over their heads. But hanging plants can offer a great deal more, depending on how they are selected.

A hanging plant does not simply mean Boston ferns, Swedish ivy, and spider plants, although these are remarkably easy to grow. There are some foliage plants which sport colorful stripes and veins, while others offer weird and intriguing leaf shapes. There are also a great many flowering plants ideal for indoor hanging baskets, each suited to different levels of light exposure, as well as temperature and humidity ranges.

In fact, it is possible to find an indoor hanging plant for every conceivable situation. The trick is actually reading plant labels before bringing a plant home and also doing some quick horticultural research before visiting a reliable garden center.

Some basic concerns for hanging plants involve just how you plan to hang them. Nothing is less appealing than simply dangling an inexpensive plastic pot from a hook in the ceiling. Instead, consider grouping three or five containers of various sizes together in an open, well-lit area and hanging them at different levels. Your arrangement will create a sense of both height and depth. While determining the height at which you will suspend the plants, keep in mind that you will want ready access to the plants for ongoing care. Sometimes it is best to hang pots no higher than eye level, depending on the location.

Also, the container need not be the typical plastic pot and attached saucer. The saucers often overflow, creating a mess, and the pots are usually very cheap in appearance. You might want to set a plain pot with drainage holes inside a more decorative pot or container without a drainage hole. You will avoid spills, and decorative containers can offer a broad range of textures and styles, which will enhance the overall appearance of your plants.

It is often useful to set plants into a soil-less medium to reduce weight, rather than relying on a heavier standard potting mix. Some soil-free mixes are specifically made for hanging plants and help conserve moisture and enhance aeration for growing roots.

When it is time to water your plants, it is preferable to actually take the plant down and water it in a sink, at least on occasion. This approach ensures complete drainage, and also allows you to inspect the plant more closely for pests while tending to damaged foliage, dead flowers, and other pruning chores. In addition, use this opportunity to thoroughly rinse off the foliage, removing potential pests and dust. In fact, removing dust actually increases the amount of light which can reach the leaf surface.

As for the plants, do not limit yourself to traditional selections. Common asparagus ferns are all well and good, but why not a look a bit further for a special cultivar like Emerald fern (Sprenger asparagus)? And why settle for plain green foliage when there are hundreds of variegated plant species which will give you bursts of gold, cream, and brilliant yellow, such as the popular Goldfish plant (Columnea microphylla)? Or substitute variegated Swedish ivy (Olectranthus coleoides 'Marginatus') for its lackluster cousin. Other interesting foliage plants, like the large-leafed Fittonias, feature either deep red veins (Mosaic Plant), or brilliant silver veins (Silver Net Plant).

Of course, entering the world of colorful foliage requires special attention to light exposure. Always select the proper plant for the proper location. For example, not all plants thrive in direct sun. Two varieties of Arrowhead vine (‘Emerald Gem' and ‘White Butterfly') are among the most beautiful trailing plants readily available. Given moisture and shade, they will thrive for years. But place them in too much light and they will literally fade away and die.

Location is not just a matter of sunlight and shade, however. One of the most intriguing hanging sedums, Burro's Tail (Sedum morganianum), has leaves or "pads" which are easily dislodged through handling. Such plants are best kept out of reach of children, pets, and tall human heads.

Hanging plants can offer colorful flowers in addition to exotic foliage. Christmas and Thanksgiving cactus are perhaps among the most used flowering indoor plants, although many garden centers also offer knock-outs like Lipstick vine (Aseschynathus radicans), which boasts profuse bright red tubular flowers, and Italian Bellflower (Campanula isophylla), an alpine perennial which does well in cooler indoor locations. One of the most unusual trailing plants is the Rat's-tail cactus (Aporocactus flagelliformis), an absolutely stunning cactus specimen with striking pink flowers. If you can recover from the unpalatable common name, you may find that this might be the only hanging plant you will ever need to impress friends and visitors.

Orchids, naturally, offer an amazing range of colors and growth habits, although they are a bit more temperamental than grape ivy. Devotees, nevertheless, will justifiably argue that the plants are worth all the extra care and attention. In fact, for sheer horticultural hubris, an upscale gardening concern offers an wrought-iron globe with built-in magnifier for displaying and viewing one's prized specimen.

On a more mundane level, bright kitchen windows provide an ideal environment for garden herbs. Culinary favorites like parsley, chives, and rosemary can do extremely well indoors, whether grown together as a miniature hanging garden or planted and cultivated separately.

The most important step you can take with hanging plants begins with selecting species most suited to your environment, including light, temperature, and humidity. But you should also select plants based on your personality. Choose something exotic, fun and different, if you enjoy caring for and exhibiting plants. If not, you can still add color and life to your living space by referring to the following list of dependable, time-proven favorites.

Copyright 2009, Joseph M. Keyser

Reliable Hanging Plant Species

Asparagus fern
Basket begonia (Begonia tuberhybrida pendula)
Baby's tears (Soleirolia soleirolii)
Christmas/Thanksgiving cactus
Creeping fig (Ficus pumila)
Devil's Ivy (Epipremnum pinnatum)
Ferns (numerous species)
Grape ivy (Cissus rhombifolia)
Hoya (Wax plant)
Ivy species
Kalanchoe
Lipstick vine (Aeschynanthus pulcher)
Philodendron species
Pothos species
Rosary vine or Hearts Entangled (Ceropegia woodii)
Spider plant (Chlorophytum comosum)
Swedish ivy (Plectranthus oertendahlii)
Wandering Jew

GreenMan at the Energerium

Earlier this year, the "Energerium" opened to enthusiastic crowds in Arlington, Virginia, exploring the interconnectedness of people, the land, and the energy that runs through all living systems. Join me as I discuss this new educational opportunity and resource with Chief Naturalist and Park Manager Martin Ogle at Potomac Overlook Regional Park.

Great Gourds! In Praise of Pumpkins

As you select and prepare to carve a pumpkin this Halloween, you should pause to reflect on the vast impact this humble gourd has had on our cultural history.

Pumpkins generally trace their origins to Central America, and collections of seed have been found in Mexico dating back several thousand years. Today, pumpkins are grown on every continent except Antarctica, and have found their way into our legends and traditions, kitchens, kitschy competitions, and media.

In literature, we should remember poor Ichabod Crane, knocked for a loss by a pumpkin lobbed by the headless horseman of Washington Irving’s “Legend of Sleepy Hollow,” or even Cinderella’s enchanted carriage. Then, of course, there is the now classic book and television special “It’s the Great Pumpkin, Charlie Brown,” or the more edgy Pumpkin King, in Tim Burton’s “Nightmare Before Christmas,” to say nothing of the early 90’s band, Smashing Pumpkins.

Culinary uses range from traditional pumpkin pie filling and pumpkin butter, to protein-rich seeds, which can be roasted and salted. The meat of the pumpkin can also be boiled or fried, diced or pureed, and has found its way as a filling for sweet Italian ravioli, soups, and numerous vegetarian dishes. Some microbreweries even produce a seasonal pumpkin ale.

Lately, florists have gotten into the act and use pumpkins as containers to fill with autumn-themed flowers as centerpieces or gift baskets.

If these notions have you seeing orange, then keep in mind that pumpkins come in a host of colors, from the red “Rouge D’Etant” to varieties in gold, buff, greenish-blue, and blue. New cultivars named “Casper” or “Baby-Boo” offer white pumpkins, which might be particularly ghoulish when carved.

Another important variety includes the giant pumpkins, perfect for competitions. Gourd gardeners are now approaching the 1,500 pound barrier on individual specimens. The 1,000 pound mark was broken in 1996 with the variety “Atlantic Giant,” and within the past several years a 1,458 pound specimen made its way into the Guinness Book of Records. There are also articles about a man who grew more than 2,700 pounds of pumpkin on a single vine.

Another somewhat less-dignified competition includes the popular “pumpkin flings” held each year, such as the “World Championship Punkin Chunkin” in Delaware. Approximately 30,000 people gather to watch medieval style catapults, 100 foot-long cannons, and four-story tall slingshots shoot ten-pound pumpkins up to 4,000 feet through the air.

However, pumpkins no doubt have their greatest appeal when artfully carved and illuminated as Jack-o’-Lanterns for Halloween. And while this tradition is relatively new, especially in the New World, its origins extend back thousands of years into the misty past.

We begin with Celts celebrating the “Feast of Samhain” on November 1. The feast takes its name from the Gaelic Samhraidhreadh, meaning summer’s end, and is a celebration of the final harvest, which featured bonfires, food, dancing, and costumes. It is also an important mystical time, the start of a new year, when the transition between seasons opens a doorway into the realm of spirits.

Samhain is also identified as a godlike individual, sometimes defined as a “lord of the dead.” This mythic figure is depicted carrying a lantern or spectral fire, with which he guides lost and roaming spirits to the supernatural realm. His appearance is also associated with Will-o’-the-Wisp, or Welsh “Corpse Candles,” ghostly flames which move over bogs and through cemeteries.

The Feast of Samhain began its “conversion” to Halloween in 844, when Pope Gregory transferred the Christian feast for “All Saints” or “All Hallows” (meaning “holy”) from May 13 to November 1, to coincide with the Celtic “pagan” festival.

As centuries passed and traditions fused, the figure of Samhain guiding spirits with a spectral light was seemingly recast by Irish storytellers as a Christianized Jack-o’-Lantern. Incidentally, “jack” is no more than a term for any common man, and therefore Jack-o’-Lantern simply means “man with a lantern.”

The tragic legend of Jack holds that he was an inveterate prankster whose cunning ran afoul of the devil himself. Upon his death Jack finds that he is barred from heaven for never having performed an unselfish act, and similarly banned from hell. Doomed to a twilight existence between worlds, Jack carves a turnip and creates a lantern to guide his way, lighting it with an infernal ember coaxed from the devil.

The tradition of carving lanterns out of turnips and lighting them with embers or oil continued for centuries among Irish households. Moreover, like the medieval practice of carving gargoyles on cathedrals to scare off malevolent forces, the Irish carved ghastly visages into their turnips to ward off those evil spirits who roamed the countryside.

In time, of course, Irish immigrants brought their turnip carving to the new world, where they happily discovered a much larger gourd suitable for carving. And yet, one has to wonder what the ancient Celts and their Druid priests might have made of “punkin chunkin.” We will have to ask them when they show up again on the next Samhain.

Copyright 2009, Joseph M. Keyser

Turning Office Spaces into Greener Places

The modern office is generally a product of strict efficiency and economic design. Lines are straight, wall-coverings are bland, windows are sealed shut, lights fluorescent, and cubicles ubiquitous. And this is where many of us spend the better part of our lives. Perhaps it’s time to consider personalizing – and naturalizing – these uninviting spaces. And the best place to start might be with a favorite houseplant brought from home.

It’s amazing what a welcome addition a plant can be in the workplace. It’s just a simple little living thing, and yet, perched amid the photocopied reports, Post-it notes, and tangled telephone cord, it has the power to transform even the most cluttered of desktops into something uniquely you -- and special.

Even if you have only one African violet by your elbow, it might be enough to distract you from your spreadsheet for a few moments to examine whether a new batch of flowering buds is forming. Perhaps an office mate will wander over to ask you how often you feed your plant, or where you got it. In a sterile environment, that humble plant is an oasis of life. Your spreadsheet can wait.

And if one plant can work such wonders, what about an office-full of them? Truly, plants can enhance the modern office in ways that most people can barely imagine.

Aesthetically, plants can add color and texture to almost any space, however plain. Taller plants or groupings of larger plants can become living architecture to help direct foot traffic, soften harsh corners, create privacy in seating areas, or add verticality in an unending sea of cubicles. Hanging or elevated planters can create a sense of movement when filled with hanging grape ivy or trailing philodendron vines.

Using similar plants throughout a larger space can also provide a unifying or cohesive element, tying and blending together a disparate array of desks, copying machines, doorways, cabinets, and partitions. The final impression is calming and ordered, rather than chaotic.

Plants can function as eye-catching focal points, or discretely mute or camouflage unattractive features. Above all, they add a sense of vitality to an interior landscape of metal and machines.
They can also play a substantial role in promoting physical and psychological health. Clinical studies in Britain and Northern Europe have shown that plants in the workplace reduced stress levels and fatigue by more than 30 percent, along with the symptoms associated with colds and flu, such as coughing and sore throats.

These green allies can also promote good health by cleaning a host of potentially dangerous pollutants from indoor air. Those veneer-and-laminate bookcases, formica-clad desks, carpets, painted walls, and computers, printers, and fax machines are off-gassing a variety of volatile organic compounds (VOCs), including formaldehyde. All-in-all, it’s a nasty stew of bad air, generally trapped – along with you – in a closed loop ventilation system.

Fortunately, there’s Mother-in-law’s tongue. I don’t mean my mother-in-law, Melva, who’s also very helpful and health-conscious, but the plant, also known as snake plant (Sansevieria trifasciata). This popular and sturdy plant grows elegantly tall, and sometimes flowers, even in low-light, and it is an absolute whiz at snatching pollutants from the air.

But Sansevieria are not alone in this ability. NASA studies in the late 1970s identified a large number of common indoor plants capable of filtering VOCs from the air. They ranged from aloe vera, which needs bright light, but is easy to divide and share with office mates – and serves as a nifty balm for paper-cut fingers, to magenta-striped dracaena, peace lily, and golden pothos, perhaps the toughest indoor plant around.

Simply put, most of the plants best suited to indoor conditions can help clean indoor air. Moreover, ongoing studies show that plants clean the air not only through the stomata or microscopic pores on the leaf surface, much like the filters in home furnaces and HVAC systems, but also through the action of bacteria in the potting soil, which normally make nutrients available for the plant’s root system.

In controlled environments, the soil microorganisms were capable of removing and absorbing up to 20 percent of the air contaminants. Together with the plants themselves, these invisible colonies represent an indoor living system functioning much like the trees, grasses, and algae found outdoors.

But the real value of introducing plants probably goes deeper than stress-busting, filtration, and décor. In a world that keeps us indoors far-too-long, bringing a bit of the outdoors inside keeps us connected with a larger living world. And beyond the momentary distraction of looking at a blooming bromeliad, the plants also require watering, feeding, and care. They require a time apart from the routine of databases and spam-deletion – a time to actually nurture another living thing. Surely that’s a simple enough bit of occupational therapy.

And then there’s the issue of community – human, not plant. In a world of passwords and name badges, your salmon-budded kalanchoe is a bridge to fellow workers. Perhaps you might divide up one of your succulents for them, or share the decades-old history of your mother’s braided willow-leaf ficus, now thriving by your window. They in turn might bring in a rooted cutting for you, or ask to share a window ledge for their Christmas cactus. That’s how friendships – and communities -- start.

Your office plant can stretch forth your personality, invite a much-needed compliment, and allow you to share and connect with others. It shows, quite humbly, as Shakespeare noted, that “One touch of nature makes the whole world kin.”

Copyright 2009, Joseph M. Keyser

Greening & Cleaning Your Indoor Air

The overall quality of indoor air in our homes and offices has been declining steadily during the past three decades. Concerns regarding energy conservation during the 1970s led to superior insulation materials, tight-fitting windows and doors, and other construction features which have effectively bottled up our living and work spaces. Unfortunately, while keeping out cold drafts, those design elements have also sealed in a host of potentially harmful air pollutants, leading to "sick building syndrome" and other health issues.

Some of the offending pollutants include biological contaminants, such as black mold, and gases like carbon monoxide and radon. However, "off-gassing" is another modern phenomenon that is contributing significantly to indoor air pollution. Off-gassing is the release of various organic compounds by some particularly common sources all around us, ranging from furniture and floor coverings to paper products, printed materials, paint, and simple plastic grocery bags.

The off-gassed chemicals are basically used as adhesives and binding agents, solvents, coatings, fire-retardants, insulators, and so forth. Among the most common is formaldehyde, which is found everywhere from particle board and pressed wood products, to carpet backing and floor tiles, paper towels, and even permanent-press clothing. There is also benzene, which is found in paints, dyes, inks, and plastic, and trichloroethylene, also used in paints, lacquers, and adhesives. There are scores more, but the obvious fact is that we live in a largely synthetic, manufactured world, and now those synthetics are starting to affect us adversely.

As a delicious touch of irony, the solution to our synthetic problems might actually be all-too-natural. Specifically, the answer might be as simple and elegant as the common indoor plant. After all, we have turned to indoor plants to bring a splash of color and vitality to sterile office environments, and to brighten windows and corners in our homes. Like the fern-filled parlors of our Victorian ancestors, perhaps we, too, still feel a certain kinship with nature which prompts us to bring a little bit of the outdoors inside.

Regardless of our motivation for having indoor plants, that humble pothos on a window sill or corn plant stretching up to the ceiling of our office is working overtime to absorb and otherwise neutralize many of the harmful chemical compounds being off-gassed at our expense.

The majority of the research examining plants as natural air cleaners comes from Dr. Bill Wolverton and fellow scientists at NASA's Stennis Space Center in the early 1990s. NASA has been concerned about the long-term environmental health consequences of off-gassing from the hundreds of chemical compounds found on shuttles and space stations. A two-year study was conducted which involved plexiglass chambers containing a variety of plants into which different pollutants were introduced and measured.

Amazingly, plants like aloe, philodendron, snake plant (Sanseveria), and golden pothos removed up to 90 percent of the formaldehyde injected into the chamber. Dracaena, peace lily (Spathiphyllum), English ivy, and Gerbera daisy helped remove up to 80 percent of the benzene in their closed system. And many of these same plants also reduced TCE levels by nearly 50 percent. In fact, numerous plants were effective at removing a broad range of the most dangerous compounds and other pollutants, including carbon monoxide.

Moreover, while the many thousands of stomata or "pores" on each plant leaf handled much of the filtration process, further research revealed that even roots and bacteria in the plant's soil helped absorb some of the toxic substances. It is also believed that over time, plants and soil microorganisms may in fact adapt themselves to absorb even more and different contaminants, turning to them as a source of nutrient, much like nitrogen and carbon dioxide.

Those of us still trapped on Earth can easily take advantage of these exciting findings by simply adding one medium-sized indoor plant per 100 square feet, especially using the plants listed below. According to NASA researchers, just 15 plants can help clean the air of the average 1,800 square foot home.

In reality, of course, adding a few potted palms to your home or office will never provide completely healthy indoor air. Greener, cleaner air requires that consumers and building managers select more natural products for their home and office, whether in furnishings, floor coverings, wall paints, or even everyday cleaning compounds. But, then again, it never hurts to add a few more ficus trees to your lobby or put a couple cheery chrysanthemums in your kitchen window.

Copyright 2009, Joseph M. Keyser

Plants for Cleaning Indoor Air:

Aloe Vera
Areca Palm
Australian Sword Fern
Bamboo Palm
Boston Fern
Chinese Evergreen
Christmas Cactus
Chrysanthemum (Pot Mum)
Corn Plant
Cyclamen
Dieffenbachia
Dracaena Marginata
Dracaena ‘Janet Craig’
Dwarf Date Palm
English Ivy
Ficus
Gerbera Daisy
Golden Pothos
Peace Lily
Philodendron
Prayer Plant
Reed Palm
Rubber Plant
Snake Plant
Spider Plant

More Information

How to Grow Fresh Air: 50 Houseplants to Purify Your Home or Office, B. C. Wolverton, Penguin, 1997.

Your Naturally Healthy Home, Alan Berman, Rodale, 2001.

“Air Cleaning House Plants”

“Chemicals and the Best Indoor Plants to Clean the Air”

“Top Ten Houseplants for Cleaner Air”

“NASA Study: Plants Clean the Air”