Our largest hydroponic grow box! 4' wide x 6½' tall x 2' deep
This stealth hydroponic grow cabinet is big and potent! Measuring 4 feet wide and 6½ feet tall, Grow Box USA's Patent-Pending, Handcrafted in the USA Silverback is not for the faint of heart! With up to 720 Watts of potent LED lighting availabe you can count on the Silverback to produce heavy fruits and vegetables along with massive yields. Just like all Grow Box USA's cabinets, The Silverback completely turn-key, is whisper quite, runs extremely cool, leaks no light and guarantees 100% odor control!
Featuring a propagation and a fruiting/flowering chamber, this grow box increases your annual yield by allowing your clones to grow at the same time your main crop is fruiting/flowering. This means nearly twice as many harvests every year plus you are able to keep your plants genetics for life!
New for 2015, we are proud to offer as an option our Duo-Drive series of switchable, 11-way, 5 watt diode LED lights along with an extremely potent Grow Box USA modified Botanicare Ebb and Flow hydroponic system!
Flowering/Fruiting Chamber with Advanced LED Lighting
Learn more about guaranteed results with our advanced LED lighting. »
Our standard LEDs are not your typical UFO lights. These LED lights feature 9-way, 3 watt diodes, deep penetration lenses, an aluminum chassis, the most robust power supplies, and double ball bearing cooling fans. Now the big news! New for 2015 is our optional Duo-Drive series of switchable (veg or bloom) 11-way, 5 watt diode LED lights. These are absolutely the best LED grow lights money can buy! Learn more »
100% Odor Control Guaranteed with Our Patent-Pending Air Scrubbing System
Our air scrubbers stop even the worst plant odors from escaping your box! Every Grow Box USA cabinet features our patent-pending air scrubbing system guaranteeing 100% odor control. No other manufacturer can match that! Learn more »
100% Light Containment
We seal our cabinets so 100% of light is trapped within. Learn more »
Extremely Quiet & Energy Efficient
The grow box includes six whisper quiet exhaust fans, dual circulation fans, and costs less than $30 a month to run.
Fully Automated - Lights, Fans, CO2 System, Hydroponic System, and PH Controller
We are the only manufacturer to offer a fully automatic PH up and down adjusting system, allowing you to leave your grow box unattended for up to 14 days. Learn more »
Optional T5 or LED Side Lighting
Add side lights for even bigger yields!
Dual Circulation Fans
All our grow boxes make excellent odor proof dryers! When you harvest, simply remove your lights and reservoir. Then hang your plants from the light hooks. During the three to five day drying period, all odors will be removed -- so your house will never smell like curing plants!
T5HO Cloning Chamber Lighting with Cloning Tray, Humidity Dome, and Inserts
Increase your annual yield by growing clones at the same time your main crop is fruiting. This means nearly twice as many harvest every year and you are able to keep your plants genetics for life!
Potent and Easy-to-Use Hydroponic System
For 2015 we are proud to offer as an option a Grow Box USA modified Botanicare Ebb and Flow Hydroponic System. Our standard hydro system works wonderful but this new Ebb and Flow takes it to the next level! Learn more »
Double Layer Reflective Mylar
Water Cooler in Main Reservoir
The internal cooler keeps your water below 70°F, so your plants avoid rot and diseases caused by warm water. Plus, it keeps the oxygen level at optium so your plants grow at their maximum possible rate! Learn more »
Internal CO2 System Included
By using our included CO2 system, your plants will grow up to 30% faster and produce heavier yields.
Real Outlets with GFI Protection
Wired for safety, equipment protection, ease of use, and a neat appearance. Learn more »
Three Point Door Lock with Keys
16 Gauge Welded Frame with 16 Gauge "Piano" Style Hinges
Instructional DVD plus FREE Exceptional Grow and Technical Support
With 25+ years of growing experience count on our team to provide you with superior after the sale support to ensure you get great results! We'll help you become a grow expert in no time.
Hand Crafted in Altoona, Wisconsin
Five year warranty the Box itself, three year warranty on the LED lights plus a one year warranty on everything else.
(3) 90 Watt, 9-Way, 3w Diode, Deep Penetration LED Grow Lights (3x135w available)
(720 Watt, Switchable, 11-Way, 5w Diode Duo-Drive LED Light optional)
Multi Position Light Hangers
Exclusive Patent-Pending Air Scrubbing System; Guaranteed 100% Odor Control
(8) "Whisper Quiet" Exhaust Fans
(2) "Whisper Quiet" Intake Fans
9 Plant DWC/Drip Feed Hydroponic Reservoir (Modified Ebb and Flow available)
Grow Box USA Hydroponic Aeration System
Zero Maintenance Water Cooler
(2) Water Pumps
Grow Box USA's Plant "Low Stress Training" Kit
Isolated Propagation Chamber with dedicated Air Scrubber
(2) 24 Watt T5HO Grow Lights (with vegetative bulbs)
Cloning Tray, Humidity Dome and Inserts
Rootech Cloning Gel
(1) Bag of Premium Hydroton
(24) Rapid Rooter Grow Plugs
Air Pump with Airstone and Air Line
Temperature and Humidity Monitor
(2) AAA Batteries
AquaPro AP-1 TDS Meter
PH Adjusting Kit
Dual Circulation Fans and Magnets
(4) Dual Outlet Grounded Timers
Internal CO2 Boost Bucket System
GH FloraDuo A and FloraDuo B Nutrients (1 Quart Each)
Professionally wired with GFCI Protection on all electrical outlets
100% of Light blocked inside
All Steel construction
16 Gauge welded Frame with "Piano" style Hinges
Three point locking door with (2) Keys
Instructional DVD and written Instructions
15+ Year Life Expectency
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Frequently Asked Questions
How much is shipping on this product?
Ship your grow box anywhere in the continental US for one low rate! For international orders, please email or call for a quote. Curbside delivery* (end of your driveway) is standard while inside delivery (inside your garage) is available for an additional $75.
Most orders ship within two to three business days by standard freight.
Standard shipping rates for grow boxes sent to the continental US:
Ship your Silverback for just $349 (Freight)
International shipping available:
US Virgin Islands $900
Other locations are available, please email for quote. If an order is submitted without international shipping included, we reserve the right to add the additional fee to the order after the sale is complete.
Orders shipped outside the lower 48 US states or Canada are shipped in heavy-duty shipping crates to protect the cabinet during the journey to you!
International pricing normally includes curbside delivery to your address. International customers may be responsible for any additional costs such as (but not limited to) duty, warehouse, and customs charges. A 600 Watt or greater power inverter is required in some countries as all cabinets are US standard 110v 50/60hz (We offer a 1500 watt power inverter with surge protection).
* Residential delivery is not available in all countries. Customer may need to pickup or arrange delivery from closest available freight station.
How much space does my new cabinet need?
All Grow Box USA cabinets need just two inches of space on all sides and 6" up top. Our cabinets can be placed in a very small area as long as the room is properly ventilated.
What temperature does the room have to be to use the grow box?
Our grow boxes are designed to operate with room temperatures as low as 63 degrees and as high as 80 degrees Fahrenheit, depending on model.
Your competition told me that your grow boxes allow mold to form under their mylar. What's the scoop?
This is absolutely false! No, mold does not form under our reflective mylar nor anywhere else in our grow boxes. We tape all our seams and every square inch of our mylar is glued into place. There is simply no way for moisture to work its way behind our mylar, even if you spill water directly in the cabinet. We just disassembled our first prototype, after 3 1/2 years of use there was absolutely no moisture or mold behind the mylar.
What can I expect for a yield from my new cabinet?
Your yield depends on what type of plant you are growing. A general rule of thumb is The Misty grow box can produce 1-2lbs of dried fruits/vegetables annually, The Classic grow box can easily produce 10lbs+ of usable plant matter annually, and The Fullback and Silverback grow boxes produce even more!
Why do you offer a net trellis system with your grow tent but not with your grow boxes?
We recommend using the "Low Stress Training" technique instead of a net trellis with our grow boxes. With Low Stress Training, you bend your plants into the corners and tie them down; this allows you to control where your plants grow. This technique allows you to use every square inch of your grow box, with a net trellis you have very limited control. A net trellis works great in a large tent where you don't have the time to tend every plant individually. Our competition uses net trellis as a sales gimmick with their grow boxes; we are aware we may lose a sale or two because we don't offer a trellis in ours, but we will not sacrifice performance just to make a buck.
How many plants can I grow in my grow box?
Our competitors claim you can grow up to 16 plants in their main chamber and up to 50 clones in their cloning chamber yet their box is smaller than our Fullback... this makes no sense. The fact is they are exaggerating just sell their product. At Grow Box USA, we never mislead and always pass factual information on to our customers.
The Silverback Grow Box: 7-9 plants, 24 clones
The Fullback Grow Box: 6-8 plants, 12 clones
The Stanley Grow Box: 6-8 plants, 12 clones
The Desa Grow Box: 4-6 plants, 12 clones
The Halfback Grow Box: 7-9 plants
The Misty Grow Box: 2-4 plants
Do I need to use a power converter?
If you live in the USA or Canada, simply plug your grow box into any standard outlet. A power converter/regulator will be needed for international customers. For your convenience, we offer an extremely high quality power converter/voltage regulator at a great price. Simply select this option on the right when you order your grow box or tent.