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!

Mills Nutrients

Remo Nutrients

Featured Products

Unique double ended constructions allows doe maximum optical efficiency and uniformity.
$16.95 - $109.95
B’Cuzz Blossom Builder increases the essential oil production of your plants increasing their size, scent, and flavor when the bloom.
Ozone is great at removing smoke, or strong pet smells. It kills mold and mildew in basements, and can eliminate powdery mildew on plants.
Heavy duty 5 gallon measuring bucket that is perfect for a variety of garden-related tasks.

Newest Additions

?If you need a tough controller that can handle any kind of lighting system you throw at it, the Titan Controls® Spartan Series® 4 & 8 Light 240V Controllers are the right choice for you.
When you’re in the garden, function is everything. You might be out there all day, and with all of the harsh lights helping your plants to grow, it’s important to have proper eyewear.
If you’re looking for a user-friendly, high capacity digital lighting controller with dual-zone control, then the Autopilot PX1 Digital Lighting Controller is the option for you.
The Phantom Commercial DE Open Lighting System with USB Interface is your newest, and best lighting solution.
TotalGrow Full Spectrum LED Grow Light Bulb is a 12 watt LED grow-light that screws into any standard socket. Perfect for any growing setup!
Looking for a natural fertilizer that is perfect for your indoor or outdoor garden You need to try Buried Treasure Liquid Guano today!
$50.95
Save 15%
The Titan Hercules 3 is perfect to control any ac unit or dehumidifier you might have.
A new expansion of the Eye PowerVEG line. With four new lamp colors, each designed for a specific stage of your plants growth cycle, we guarantee impressive hobby quality results.
$89.77 - $213.77
Mammoth P is a brand new biological inoculant and we can't say enough good things about it! It's designed to maximize phosphorus and micronutrient cycling, making those healthy nutrients easier for your plants to absorb.
Roots Organics Seabird Guano is an excellent source of phosphate and calcium to encourage vigorous plant growth.
HydroDynamics Europonic Silicate is the strongest product on the market with 11% Silicon Dioxide, it’s proven to protect your plants from the hottest days of summer to the early frosts of fall.
Titan Controls Repeat Cycle Timer is a great solution for hydroponic system watering functions, especially ebb & flow and aeroponic systems.
EZ-Clone’s new 9 site cloning machine is perfect if you’re looking to introduce new growers to the benefits of aeroponic plant cloning.
EZ Clone Classic 128-site features a new leak proof design and an increase in structural integrity.
$16.95
Save 26%
Papa’s Perfect Poop is one of our favorite new products! We know it will be an essential part of your supersoil mixture after the first try.

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.
Michigan

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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