Specializing in indoor gardening and hydroponics growing!

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Growco Indoor Garden Supply has been supplying growers with the best quality organic fertilizers, hydroponics systems, and indoor gardening supplies since we opened our first retail store in 1999! Large Orders

We now have two incredible retail stores in West Michigan, and a dedicated full-time warehouse for our internet customers. We stock all of the items that you'll find on this website at the lowest possible price, and we always ship orders out on same day we receive them or on the next business day! We specialize in complete growroom packages, and we will gladly take the time to help you build the growroom of your dreams! Large orders, pallets of soil- whatever you need for your indoor garden- you've come to the right place, we're here to help!

Emerald Harvest

Mills Nutrients

Featured Products

Unique double ended constructions allows doe maximum optical efficiency and uniformity.
Ozone is great at removing smoke, or strong pet smells. It kills mold and mildew in basements, and can eliminate powdery mildew on plants.
The Nextlight Mini LED Growlight is a small bulb that runs on just 150w, the Mini is a powerful LED Growlight that sports the full, highly-acclaimed NextLight full spectrum.

Newest Additions

If you're looking for a condensate pump kit for your Quest Dual 105, 155, 205, or 225 dehumidifier, then this is the one that fits!
Circulating 925 cubic feet of air per minute a 1.9 amps, this fan gets air moving the way you need, at a very small sacrifice of space.
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Easily installed, this remote wall mounted humidistat can be adjusted from 20%-80% RH humidity, and comes complete with positive On and Off settings.
The Quest CDG74 It's durable enough to stand up to anything you can throw at it, with high-quality components and a heavy duty protective ROTO case.
This digital control is easily mounted on your indoor garden wall, and set with the touch of a button.
This Quest Dual 110/150 Supply Duct Kit is the appropriate attachment for the supply side of Quest Dual 110 and 150 Dehumidifiers.
These handy 10 inch flanges connect right to the air outlet on your dehumidifier, allowing you to attach a bit of ductwork going to the indoors.
Simply hook this return duct kit to the intake on your Quest Dual 150 Dehumidifier, and you'll then be able to attach a small amount of ductwork to the unit, allowing you to place the dehumidifier outside.
Simply attach a limited amount of ductwork to the intake on your Quest Dual Dehumidifier with this kit, and you'll be able to place your dehumidifier outdoors, and out of your way.
The MovinCool Indoor/Outdoor Portable A/C Classic Plus 14 unit is the most convenient, easy-to-use grow room air conditioner on the market.
Need an air conditioner you can move anywhere From indoors to outdoors, the MovinCool portable Classic Plus 26 air conditioner is your answer.
?For an air conditioning unit that's compatible with both outdoor and indoor gardens, you can't beat the Classic 40 semi-portable indoor/outdoor model from MovinCool.
Keep your garden cool this year with the MovinCool Indoor/Outdoor Air Cooled Semi-Portable A/C Classic 60 unit.

We always ship in heavy-duty plain brown boxes, and our 15 years of shipping experience help to insure that you will receive your order intact and undamaged every time! We warehouse all of our products, and pride ourselves in getting your order to you fast!

Our staff has many years of hands-on experience
helping customers build grow rooms, dial in nutrient programs, and make seriously productive gardens. Huge selection, low prices, and fast shipping- Growco wants to be your favorite grow shop! Let us help you learn to grow like a pro!

Private, secure online ordering. No registration needed to order. We strive for your complete satisfaction - we want to be your "go-to" source for performance gardening supplies!

Why shop at 4hydroponics.com?

  • FREE shipping on most orders $250 or more when delivered in lower Continental USA.
    (Sorry, Alaska and Hawaii not included.) Oversized or heavyweight items not included.
  • NO sales tax when delivery is outside of Michigan. In some states that's a 10% savings!
  • VERY competitive pricing.
  • No registration needed to place an order.
  • When we ship your order, magazines or catalogs are liberally included. (More info)
  • Read customer feedback here.

Shipping to Michigan? Expect delivery within 2 business days!

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Garden Watchdog Top 5 Organic Seeds in stock Hydro for Hunger participant OMRI Listed
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