Palram Greenhouse HG5008 Review


The Palram Greenhouse HG5008
The Palram Greenhouse HG5008


 The Palram Greenhouse HG5008 is the lowest priced greenhouse with polycarbonate panels in my group of greenhouse reviews.





 The Specs And The “Hecks”

HG5008 dimensions

It is 8 feet long and 6 feet wide…offering 48 square feet of growing area…which is a bit small for me, heck.  But, if you are a low-key gardener, this little beauty may be for you!

With a height of 7 feet (actually 6 feet, 10 inches) from ground to peak, the greenhouse interior allows most of us to fully stand in the center…unless you are a forward on a professional basketball team.

 However, the hinged door’s height is a shade less than 5 feet 5 inches so watch your head when you enter….OUCHHECK.

The vertical sides are about 4 feet high before the roof angles to the peak which means some bending over to access plants around the edges.

The durable, rust-resistant frame is brushed aluminum with a heavy duty galvanized steel base.

The pre-cut, 4 millimeter thick, high-impact, double-walled polycarbonate panels are virtually unbreakable…transmitting and diffusing over 80% of the sunlight to your plants…while very successfully insulating and retaining heat.  They also completely block UV rays.

Some greenhouses may use thicker panels but, thicker panels drastically reduce light transmission…thus, they are not recommended for greenhouse use.

Polycarbonate panels are a couple hundred times more resilient than glass…and head and shoulders above the durability of 6-mil polyethylene plastic greenhouse covers.


Putting It Together

HG5008 - Sliding panels into place.

 The HG5008 greenhouse is designed to be built by “do-it-yourself-ers” and the 83-page assembly instructions show 53 steps, using exploded pictures, with a lot of numbers, circles, and arrows, to accomplish the task.

Page 3 of the instructions is in the English language and discusses the basics: customer service, safety, care and maintenance, pre-assembly notes, and recommendations.  Pages 21 through 25 list and explain the parts.  And, page 26 begins Step 1 of the actual assembly process.

A TIP:  Build this on a calm day.  The more wind…the harder it will be to set up and align both the frame and the panels.  Before starting assembly, lay out all the parts and identify the ones not marked.  And, pre-read the instructions…you may see certain steps that may need to occur in conjunction with each other…so, try to think ahead as you read and envision obstacles you might encounter.  This is a job for at least 2 people…get a third trustworthy soul if you can.  The more…the merrier…and easier!!!

ANOTHER TIP:  As you finish the greenhouse and go around tightening all the screws to firm up the structure, add a bit of Loctite to them.  Mother Nature’s winds will slowly loosen the screws without the Loctite.

 JUST ONE MORE TIP:  Run a bead of clear silicone caulk around all frame and panel interfaces.  It will not only add better waterproofing, it will keep the panels from rattling during windy days.

A most gratifying option of this greenhouse is the ability to install the door as either right-handed or left-handed!

The Palram Greenhouse HG5008 has a 5-year warranty, which is pretty good for the greenhouse market.  The base will last much, much longer than that…but, due to changing temperatures and weather conditions, over a period of time, the polycarbonate panels will slowly endure a number of scratches…and mold and algae will start to accumulate on the surfaces… creeping into the double-wall interior and lowering the light transmission percentages.

Periodically, use a disinfectant…specially designed as a fungicide, virucide, and algaecide for cleaning greenhouses, such as Physan 20.  Physan 20 is also used to clean and disinfect outdoor fountains, bird baths, and pools.

After using Physan 20, and making sure that the panels are clean and dry, apply a coating of 303 (30306) Marine UV Protectant.  The 303 will rejuvenate the UV protection…making the panels look brighter and newer…giving them much needed extra protection.  IMPORTANT:  Follow the directions on the label.

Cleaning the greenhouse panels inside and out will extend the life of the panels but, before you know it, you will still need to “bite the bullet” and replace a few of them…here…and there.

That’s why it is very practical to have some polycarbonate sheets on hand to swap out the damaged panels.

Palram Greenhouse HG5008 Roof Vent

 The roof vent is adjustable and not screened.  And, since there are no windows in this greenhouse to completely air it out and quickly lower the temperature, the door will need to be kept open, too.

OK…ANOTHER TIP:  Add some weather-stripping around the roof vent to better seal it when closed.  You may want to do the same thing for the door.

Some clever little additions to this little baby are rain gutters and a lockable door handle with a magnetic door catch.  The gutter setup can be incorporated into a water collection system using rain barrels to irrigate your greenhouse garden!

Seemingly limitless accessories are available.  They include: Automatic vent opener, Heavy duty shelf kit, Plant hangers, Shade kit, Louver window, Steel work bench, Trellising kit, and Twin shelf kit.

Since this greenhouse is fairly light…about 90 pounds total…you will want to add some long tent stakes or metal T-posts or U-Posts to anchor it if you live in an area prone to high winds.

In conclusion, this is a sturdy, durable, gorgeous greenhouse.  The polycarbonate panels should last well beyond the 5 year warranty…unless you back into the greenhouse with your garden tractor!  If this one is a little too small, there are some larger sizes (and…even smaller sizes) to choose from once you click the BUY NOW button below.

I truly feel that any gardener would be proud to own a Palram Greenhouse HG5008.  Give me your take on this exquisite little number in the comments or by email:

Can I give you a last tip?  Think…FREEZING COLD WINTER DAYS AND NIGHTS…and, that will remind you to get a good infrared heater to keep your plants from turning into icicles!


Jim, the Life Long Gardener


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4 thoughts on “Palram Greenhouse HG5008 Review

  1. Dan Reply

    Great Review. What I think is important to mention is getting green house panels that scatter light and spread diffuse light all around the plants, helping them absorb light efficiently, which I can see this green house has. Also, panels that have a red tint work extremely well. All in all for general use, this is a great green house for anyone.

    • Jim Reply

      Hi Dan,

      Greenhouse covers are designed for maximum diffusion of sunlight so that all plants in the greenhouse get their share.  And, polycarbonate panels are much better than polyethylene film for scattering light!

      However, I beg to differ with you about using red tint.  Plants use all spectrums of sunlight except green for plant growth…which means that they use red and blue light.  But, if you have a red-tinted greenhouse, it will reflect the red spectrum and the plants will not see it…thus, they cannot absorb it…and their growth can be severely limited or stunted.

      Since plants are already green (already reflecting the green spectrum), it is acceptable to tint the greenhouse “green.”  And, believe it or not, when using flexible polyethylene greenhouse covers, the green tinted covers are actually stronger than the clear covers!

      These words of wisdom on “greenhouse cover colors” come from my neighbor, Jed…a retired farmer with a lot of knowledge and a few good stories to tell.  A search for Jed on my website will give you more insight into his trials and tribulations…and successes…as a farmer.

      Take care and come back soon!


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