In 1999 I told my friend Tom White, who owns Zone Ten Nursery in Homestead, FL, I was going to build a rain forest under glass once we moved to Arkansas.  Tom, who is a botanist for the State of Florida, laughed!  He had heard that story before!  But if you ask my wife, Janice, you'll hear I'm more than a little bull headed!  We did it.  In the summer of 2006 I received an email asking for complete instructions on the process of how we constructed our ExoticRainforest,  I'm asked that question almost every week.  So here is the answer:

It is not difficult, it just requires some planning.  Actually, a lot of planning.  If you're going to build a rain forest atrium, and you're not in Florida, Southern California or a similar temperate climate, the first consideration is how are you going to keep the plants warm year round?  There are many companies who build "sun rooms", and that type of structure may work for you.  In our case, the cost of having one built would have exceeded $70,000 US dollars.  We built our ExoticRainforest for about 1/3 that cost using professional labor for the structure. 

I searched for a long time for what I considered to be the best thermal protective material.  At the end of that search I now strongly suggest you consider using a really good thermal material since it does get cold in most parts of the United States.  Far too cold for most tropical plant species.  Glass just won't do the job efficiently.  It is heavy, easily broken, and looses heat quickly. Many tropical plants do not appreciate temperatures below 55 degrees (some not that low) so you will need to provide them lots of thermal protection to keep them happy, flowering and growing.  So the first thing I had to find was a material that would do the job, would not break the bank, and would last a very long time while withstanding hail storms.  We have hail storms in the spring!

After a great deal of research I found and chose GE Lexan Thermoclear™.  There are a lot of materials out there including Lexan corrugated material. but I'm convinced the multi-walled Thermoclear™ is the best value.  Experience has proven it works great.  Mine is double walled and is around 1/4 inch thick.  It works quite well but I now wish I had used the triple wall version.  I spend enough each month in the middle of winter to heat a 600 square foot atrium to a minimum of 55 degrees to have paid for the difference in wall thickness in five years.  During the day, so long as the sun is shining, the GE Lexan Thermoclear™ will create enough heat energy from sunlight to keep the atrium comfortable.  But when the sun falls we have to rely on some type of artificial heat to do the job. 

General Electric's Lexan Thermoclear™ will help hold the heat in during the night but one of its best properties is its ability to create heat from light during the day.  With the rising price of natural gas and other fuels, especially electricity, the thicker material can save a bundle on overall heating costs.  When it gets in the 20's, and lower, the thicker material will save even more every month!  The double wall may work just fine for you depending on where you live (we're in zone 7) but at least consider spending the extra on the thicker, more protective, and more efficient material.  You may find it will pay for itself in just a few years.  You can find Lexan Thermoclear™ and information about its uses on the General Electric website and they will give you names and phone numbers of dealers who sell it.   Their address and phone number is at the conclusion of this article.

Lexan Thermoclear™ comes in either 4' x 8' or 4' x 12' sheets and is easily installed.  We built our atrium of cedar 2 x 6's atop a concrete foundation set 18 inches (46cm) into the ground.  If you want a more beautiful structure there are companies, including General Electric, that make metal frames that allow the Lexan Thermoclear™ to be simply inserted into slots within those structures.  With Lexan Thermoclear™ you can even make the walls curve slightly it you choose.  (Be sure and check with your city or county for local construction regulations.)  In our case, the Lexan Thermoclear™ is simply screwed to the wood and then thin strips of cedar applied to the seams to seal them further and make them look nicer.  The tiny gaps between sheets are sealed with silicone sealant.  Do not avoid that extra step!  If you leave the seams unsealed the Thermoclear™ is not as efficient and mold can form between the walls. 

Our building is framed much the way you would frame a standard wood home with the exception we did not want any interior walls.  My building is 17 feet tall at the highest point with 12 foot outer walls.  Since a lot of the plants have already tried to outgrow that height after only 4 years I've decided if I ever build another one, and I just may, it will have a 20 foot peak and 16 foot outer walls. 

A mistake I discovered we made after the building was finished was the size!  My wife didn't like the idea of my using the entire backyard when I indicated I wanted to build a rain forest atrium 36' by 36'.  After a lot of "discussion" I scaled the size down to 24' by 24'.  Guess what?  That is now much too small for what I need!  I have many more plants (and more I want) than I now have room.  I should have built it 36' x 36' in the beginning!  And I am going to build one that size when we move!  We are now planning to move to the Sherwood, Arkansas area to be near our children and grandchildren.  So if you'd like to buy a nice old Victorian house with a rain forest, send me a note!  My point?  Plan ahead.  You'll hate yourself if you let your love of plants outgrow what you build!  And believe me, tropical plants will grow much faster than you have ever experienced if you give them this type of structure!

Be sure to also prepare for plenty of ventilation, especially during the summer, using lots of covered fans.  Tropical species do not appreciate sitting in dormant air any time of the year.  They need adequate circulation all the time!  Dormant air, combined with high humidity, is a guarantee of plant disease and unwanted pests!  So insure the air is moving at all times.  I now recommend covered fans since some of the taller plants will eventually grow into them!  We have two ceiling fans that run in reverse all the time to draw air from the outside ventilation openings (which can be closed in winter) into the building.  But the tall Alocasia sp., Bird of Paradise, climbing Philodendron sp. and banana trees eventually find their way into the blades.  Plan ahead.  At the rear of the building we have two exhaust fans on temperature controlled timers that begin to run when the temp near the ceiling hits 80 degrees.  These help to evacuate the excess heat during the summer months.  Those exhaust fans have automatic closures which prevent heat from escaping in the winter as well as cool Spring and Fall evenings.  They also have manual on/off switches to prevent heat from being evacuated in the winter.  That type exhaust fan is commonly available at home renovation stores.  Standard greenhouse construction works very well for a tropical atrium provided you insure a very high humidity.  You can find a lot of books about how to do it at home improvement stores or good book stores.  For winter heat, we use natural gas.  Other growers have reported problems with some gas fuels such as butane.  Apparently some fuels can create fumes within the atrium that conflict with the plants ability to grow.  We have observed no problems with natural gas.

For easy access we had a 4 foot wide walkway built around the room in the shape of a "U".  That was done partly because I get around in a wheelchair and the wooden walkway makes it much easier for me to get most places in the building.  But it also adds to the beauty of the building.  In some cases you may find a simple stepping stone path will work as well.  But in my case, when I build the next one I plan to make the walk even wider at least in some places.  Plants tend to grow in over the walk and make it appear narrower that it is.  And in a wheelchair, even four feet is difficult to turn around or negotiate tight corners. Just another reason to have made the building even larger.  Be sure and use pressure treated wood.  The humidity in a tropical atrium will destroy unprotected wood in short order!

The big secret to making your tropical plants grow like they do in the jungle is the soil mixture, designing the room to hold in humidity, and the amount of water you plan to give them.  We spent a lot of time preparing the soil before the first plant went in the ground.  We mixed a huge amount of peat, good potting soil, sand, humus, cypress mulch and a few other goodies such as large quantities of Perlite™ and pellet fertilizer in our own Arkansas clay before ever planting anything.  My goal was to make the soil porous, quick draining and tropically rich while retaining moisture.  The peat, cypress mulch and humus all helped to increase the ability of soil to stay damp but not soggy.  It also tends to keep the soil pH low, something tropical plants prefer. 

As a general rule, tropical plants do not like their roots staying overly wet.  But they love moisture.  If you ever visit a rain forest you'll discover the soil there is often very easy to dig.  That's because there is so much decaying material mixed in with the growing media.  By adding lots of peat and humus, along with the other ingredients, you'll speed up that decaying vegetative process.  We add new cypress mulch regularly as it decays on the surface.  And we don't carry off all the dead leaves that collect.  We just try to turn them into the soil whenever possible and let them do their job naturally.  Those dead leaves contain natural fertilizer!  As you can see from the photos on this website it appears to be working. 

The next thing to consider is the study the plants you want to plant before you start digging.  Before you plant anything make a plan.  An inexpensive computer program called 3-D Landscaping will help.  With it you can layout where you want the planting areas, the walks, the pond, furniture and other fixtures.  Figure out what needs more light and which need less.  Rain forests have both canopies and wide open areas.  Plan for the plants that require both.  We have a descent sized group of bananas and heliconia plants that love the sun.  So one area is left fairly open so the summer sun can beat down.  But below them we have a lot of Anthurium sp., and other plants that like bright filtered light.  That way we can utilize the full atrium for all kinds of species.  In other areas where we have planted small flowering trees we planted species beneath their branches (and on their branches) that love filtered light.  We even have areas for plants that don't particularly like the sun and thrive in very low light.  Plan ahead and you'll keep everyone happy for a much longer life. 

If the plants you wish to grow require more water in their soil calculate all of that before you start digging holes.  The same is true for plants that like to dry a bit.  If you have plants that need to dry out between watering allow for that need so you don't quickly drown their roots.  In those areas add more peat moss and Perlite™.  Plan the entire building's planting areas before you put anything in the ground!  If you give the plants what they want before planting you will be shocked at how fast they will grow and reproduce.  If you read my plant descriptions on this website (http://www.exoticrainforest.com/plantscollection.html) you'll find I try to tell you what the plants will like and will not like in regards to water, soil and light.  And you'll find out you don't have to dig up nearly as many plants later and move them somewhere else! 

A large number of jungle plants are epiphytes.  They grow on the sides or up in the trees.  In fact, scientists estimate 70 to 90% of all plants and animals in the rain forest live up in the canopy!  There are more plants growing on other plants in the rain forest than growing in the ground!  Plan in advance to give them something to which they can attach themselves so they can hang down or grow upwards while attached.  You'll find the effect of a real jungle is more quickly achieved when you have hanging vines and roots! 

Since we used cedar for the entire building we allow it to be a "growing media" for epiphytes all over the building.  Our center post and center columns are 8 inch x 6 inch posts.  If you look at the photos in the Views of the Rainforest section you'll see they are now almost covered with plants which have attached themselves to the cedar.  In other parts of the building we solved the problem by borrowing an idea from Fairchild Tropical Garden in Miami, FL.  In the Fairchild tropical atrium they created a gorgeous display of orchids, bromeliads and other epiphytes by attaching rolled cork bark to 4 inch PVC pipe with screws.  The sections of PVC can then be assembled with a variety of PVC joints to create what appears to be fallen logs or broken tree branches and tree trunks laying on the ground or falling against piles of rock.  Rolled cork bark is not inexpensive but if you search for it and buy it by the bale (approximately 130 pounds) you can still find it at a fair price.  The cork bark will last a long time and with a little assistance, such as a small amount of Liquid Nails glue, you can "convince" most epiphytic plants to attach themselves. 

One grower who is building a similar building in Kentucky recently sent photos of a large rock wall with terraces.  I wish I had thought of that idea!  Especially one with an enormous waterfall down the center!  That technique is known as a "wet wall".  A small water pump is used to pump water to the top of the wall which is filled with rock and sphagnum moss.  Climbing plants such as Philodendron sp. and Anthurium sp. will grab hold of the damp rocks and climb just as they do in the rain forest!  The next ExoticRainforest will have one!

A pond is an absolute must.  Rain forest plants need the humidity and a nice pond with a waterfall will keep the humidity high all the time.  While recently visiting with a staff member at the Missouri Botanical Garden in St. Louis I was asked how we managed to get our plants to grow so thickly.  I answered "the same way you do in your main display"!  "Lots of flowing water!"  We estimate our pond holds approximately 2500 gallons.  The waterfall in the atrium runs at approximately 3000 gallons an hour when the filters are newly cleaned.  As a result our atrium rarely drops below 85% humidity and most of the time is higher.  In the morning water drips off the ceiling all over the building.  In addition, our atrium now has a complete overhead misting system which operates on an auto timer.  Our system was installed by friends Richard and Teri Baber and Teri is a member of the International Aroid Society.

There are lots of good books with instructions on how to build a pond and waterfall.  Just plan ahead about the filtration.  You will need it!  The pond is also a great place to grow tropical water lilies.  Just make sure you keep the pond from being totally covered over by large plants which will block the sunlight.  If you don't have a pond or other source of moving water in a large volume you can be sure the humidity will suffer during the winter since your artificial heat system will dry out the air.

Unless you just love to stand in the "garden" with a garden hose in hand have a good misting/watering system built attached to the rafters.  Most tropical plants like lots of water in the Spring and Summer and less in the Fall and Winter.  If you have a system put in on a watering timer you'll soon figure out just how much water everyone needs ever day.  A water timer will make keeping everyone happy a lot easier, including you, when you need to be away for a few days!  For us, 15 minutes a day five days a week seems to work best in the summer.  In the rain forest rain often falls in the afternoon at the heat of the day.  I try to copy that to some degree.  It is extremely important you maintain the humidity level at above 80% or higher and watering along with an indoor pond/waterfall will help.

And don't forget the natural sounds of the rainforest to add to your complete rainforest experience.  We installed a set of waterproof speakers attached to a CD player capable of rotating 5 CD's.  We located a bunch of natural rain forest sounds from a variety of sources and play them almost all day long on a rotating schedule.  We even located night recordings of jungles in Costa Rica that include tree frogs and an occasional howling monkey.  A great source for many different rain forest recordings is Listening Earth.  You can listen to samples on their website at: http://www.listeningearth.com.au/  And don't forget the natural ambience of rain forest animals.  We have also located some very nice South American Andes reed flute music with the sounds of rain forest birds in the background.  Very restful when you are in your "jungle". 

We added quite a few tree frogs and small lizards (anoles) which really add to the joy and experience of being in a rain forest.  Snakes?  No.  Not us.  But we did once have a grass snake find its way in somehow.  Fortunately it found its way back out before my wife could get to it!  If you do decide to add live animals be sure and plan for their nutritional needs!  We turn loose 1500 baby crickets once a month for everyone to stay fat.  And of course, don't forget to feed the crickets cat food or fish flakes so they will grow and chirp for you at night.  Since cat food is full of protein the crickets eat the protein and pass it along to the frogs and lizards.  Crickets can be ordered from a number of sources on the internet.  The listening experience created by the crickets is also incredible!  Visit a good pet store and buy a book on caring for rain forest frogs and lizards.  They are simple to keep healthy in an artificial rain forest.  Our's even produce babies each spring!

Birds flying free in your rainforest?  Well, I'm not convinced that is a great idea.  We've done it.  Forest, our Red Rump Australian grass parakeet has made many trips around the Exotic Rainforest with no apparent damage to either himself or the plants.  Our pair of Sun Conures have made a few flights but prefer to stay in or on their cage.  They know where the food is!  But the male conure has been out a few extra times and always finds something to chew.  But even though we allow our recently added Blue and Gold Macaw, Wizard, to stay on a perch outside the cage during the day she is not allowed to fly free.  Macaws are notorious for chewing on anything and everything including rare plants!  If you have rare plants that could be dangerous for your collection.  Large species, such as macaws and cockatoos, would certainly chew everything in the room.  Since our birds seem to prefer the security of their cages we have now elected to let them "stay home".  If you plan to allow birds to free-fly do not use ceiling fans!  The birds can easily fly into the blades!

A word to those of you fortunate enough to live in a climate where you don't need a building to house your "rain forest".  We once owned a home in South Florida near the coast in far southern Miami.  I elected to turn the entire backyard into a rain forest with Biscayne National Park directly across the street!  As a result many of the natural and imported "rain forest" animals moved into the yard.  We had a selection of anoles and other lizards including iguanas many varieties of tree frogs, Bull Frogs and probably a few snakes although we never saw any.  Colorful parrots and macaws from nearby Parrot Jungle even came to visit and sample the fruit from our banana and Papaya trees.  We even had an Almond Tree that produced nuts and made a perfect food source for the larger parrot species. 

The ponds were filled with blooming water lilies and we had many tropical fish in each.  One critter that has been imported into Florida from Cuba also moved in, the Buffo Toad.  Buffo Toads are not dangerous if you don't bite them.  But dogs sometimes bite them!  We once lost a very valuable and large male Great Pyrenees because he chose to bite a Buffo.  When we sold the house we thought the people bought it because they loved the landscaping.  Everyone in the neighborhood loved the landscaping and people use to visit often just to see our "jungle".   Apparently the new owners lost a small dog to a Buffo Toad.  One of my old neighbors called me almost crying and told me they had cut down everything!  Everything including the palms and concreted the entire back yard.  They did it in an effort to keep the Buffo Toads away.  Silly thing to do since the toads live in Biscayne National Park and will come in the yard if you have a jungle or nothing but concrete.  When they lost the second dog they sold the house!  I looked it up recently on a satellite photo and it is nothing but 1/3 acre of concrete with a pool in the center!  Shame.  If you build a backyard rainforest you will have to learn to accept your new "resident neighbors"!  And to borrow a line from a movie, if you build it, they will come!

You cannot imagine the joy of seeing a white layer of snow on the ground outside while being in a semi-clear building with blooming orchids, rare tropical plants and a temperature still 80 degrees in the day!  Go ahead.  Build yourself a rain forest. 

Still have questions?  Write to me:

Steve Lucas
Steve@ExoticRainforest.com
www.ExoticRainforest.com

Join the International Aroid Society:  http://www.exoticrainforest.com/Join%20IAS.html
 

After more than 25 years in South Florida, Steve Lucas is a retired commercial photographer living in Siloam Springs, Arkansas since 2001.  Almost everyone said it would be impossible to build a "rain forest" under glass.  But the nearly 300 pages on this website may persuade you it can be done.  Steve has published more than 300 national magazine articles.  His photos and stories have appeared in more than 30 magazine titles since 1982. 

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Copyright 2006 Steve Lucas, the Exotic Rainforest