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!

Featured Products

$91.00 - $166.00
Aptus BloomBoost is the best way to improve your plants' development. The all natural product uses simple sugars and other natural ingredients to activate plant flowering response.
The Claber Multi-Jet Pistol gives you a comfortable anatomical rubber grip and a convenient ON / OFF flow button on the front.
Save 14%
Deer Stopper Barrier Ribbon is the perfect solution for protecting your garden from deer, elk, and moose.
$15.95 - $50.95
GreenCure® is an organic potassium bicarbonate-based fungicide that's safe to use on any garden. Fruit and vegetables can be harvested as soon as 1 hour after spraying!

Newest Additions

The Sunleaves Lightwave CF Reflector features lightweight construction and proper light disbursement. Perfect for the indoor gardener on a budget! Need a bulb to go with your reflector Choose from 2 different VitaLUME bulbs!
Ideal-Air™ adjustable elbow ducting creates a 90 degree turn anywhere it's needed in your ventilation system.
Sun Blaster T5 HO fluorescent fixture and NanoTech Reflector is a winning pair! This combo kit will help increase lumens by up to 300%!
Save 12%
The Botanicare LT Clone Tray is an extremely shallow grow tray that will help you organize your grow room. Use it for cuttings, soil filled containers or bonsai trees or orchids.
Ushio's 1000 watt HPS Double Ended Lamp uses high red and blue spectral ratios to help increase your plants efficiency during photosynthesis and producing high flower and vegetative yields.
$49.95 - $244.95
Botanicare White Grow Trays work great for both ebb and flow systems and drip systems. They are created with heavy duty plastic and are BPA free.
General Hydroponics RainForest is a aeroponics system designed to perfect accommodate cuttings or even seeds and root transplants. It is the perfect place to give your plants the head start they need.
The Honey Been Pollen and Trim Tray Kit is the perfect lightweight tray for all your trimming needs. It also features a 150 micron stainless steel tray that separates out pollen.
Save 15%
Monterey's Neem Oil is a fungicide/insecticide power house combo that won't leave you disappointed! Try it once and you'll be hooked.
Sunleaves Bonsai Rocks help to maintain ideal growing conditions for your plants. They can also be used to help drainage in potted plants or as a top dressing in a miniature garden.
Galaxy Digital Logic Electronic Ballasts give you the ability to easily select the watts you want your lamps to run at making it one of the most versatile electronic ballasts on the market!
Galaxy Digital Logic wireless remote control features simple controls allowing you to setup and configure your ballasts and features a digital timer that allows you to sync up all your ballasts in one place.
Save 18%
Gamma Seal Bucket Lids are solution for your extra buckets. You can add to a 3.5 or 5 gallon bucket to make them a completely sealed and waterproof storage solution for your grow room!
Humboldts Secret - Golden Tree can be easily added to and grow and bloom combination to help plants grow quicker, sturdier, and larger. You will see results fast!
The EcoPlus Trumpet Style ½” inlet Air Manifold helps deliver oxygenated water to your plants. More oxygen in the water means your plants will be able to absorb more nutrients.
Zyme Alive is a tea-style fertilizer that will help your plants have a higher yield then you ever thought possible. It is full of beneficial enzymes and bacteria.

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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