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 270 Watts of LED lighting standard and a 405 upgrade available, 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 is whisper quite, runs extremely cool, leaks no light, and guarantees 100% odor control!
Flowering/Fruiting Chamber with Advanced LED Lighting
Learn more about guaranteed results with our advanced LED lighting. »
These are not the typical UFO lights. Our custom LED Lights feature 8 way (i.e. red/blue/IR/UV/white spectrums), 3 watt diodes, deep penetration lenses, an aluminum chassis, the most robust power supplies, and double ball bearing cooling fans. All this adds up to quiet, reliable, and extremely effective light. Our custom LED lights are as effective as MH/HPS, but use 80% less power and produce 80% less heat! 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 »
Wireless Humidity/Temperature Monitor
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
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
FREE Exceptional Grow and Technical Support
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 on the lights and box itself plus one year warranty on everything else.
(3) State-of-the-Art 90 Watt, 8 Way, High Penetration LED Grow Lights
Patent-Pending Air Scrubbing System; Guaranteed 100% Odor Control
100% of Light blocked inside
Multi Position Light Hangers
Professionally wired with GFI Protection on all electrical outlets
16 Gauge Welded Frame with "Piano" Style Hinges
(8) "Whisper Quiet" Exhaust Fans
9 Plant Hydroponic Reservoir with Float Valve and Backup Reservoir
Zero Maintenance Water Cooler
Propagation Chamber with Cloning Tray, Humidity Dome and Inserts
Rootech Cloning Gel
(1) Bag of Hydroton
(24) Grow Plugs
Single output Air Pump with Airstone and Air Hose
Water Pump and feed line
Wireless Transmitter and Receiver
(2) AA Batteries
(2) AAA Batteries
AquaPro AP-1 TDS Meter
PH Adjusting Kit
Dual Circulation Fans and Magnets
(3) Dual Outlet Grounded Timers
(1) 15 Minute Timer
Internal CO2 Boost Bucket System
FloraDuo A and FloraDuo B Nutrients (1 Quart Each)
Three point locking door with (2) Keys
Instructional DVD and Warranty Info
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 $299 (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 don't you offer a net trellis system with your grow boxes?
We recommend using the "Low Stress Training" technique instead of a net trellis. 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 room where you don't have the time to tend every plant individually, but in a grow box it is useless. Our competition uses net trellis as a sales gimmick, we are aware we may lose a sale or two because we don't offer a trellis, 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.