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

$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.
Sunlight Supply LEC 315 Light Emitting Ceramic is a next generation lighting fixture that includes a built-in ballast and CDM-T Elite 315/930/U/E Agro Lamp.

Newest Additions

The GroSave 200 amp Energy Controller help reduce wasted electricity by only taking exactly what your appliance needs and preventing what is normally wasted.
$16.95 - $124.95
Use Actinovate Organic Fungicide to help your plant grow bigger and stronger while protecting it from root and foliar diseases.
Hydrotek plant labels help you keep track of important information that can be vital to ensuring your plants grow healthy and strong.
$10.39 - $12.99
CAN-Lite Pre-Filters are a great way to extend the life of your CAN filters. They block initial dirt and dust particles before they enter your filtration system.
$29.95 - $56.95
MyCO2 Grow and Bloom is the perfect solution for for delivering a boost of CO2 to your garden when you decide it's time.
The Gavita DigiStar 1000w Ballast is a versatile system that lets you adjust the wattage of the grow lamp to deliver optimal lighting conditions throughout various stages in your plants growing cycles.
$199.95 - $299.95
HORTILUX Gold Series Ballasts are worth every penny. They help your grow lamps last longer and burn brighter than a regular disposable ballasts.
$199.95 - $249.95
What sets the Galaxy Grow Amp ballast apart from the others It features the lowest RFI broadband emissions in the industry (to prevent radio and TV signal interruption).
$12.75 - $25.50
NPK Industries RAW Grow in a new plant nutrient that delivers elements and supplements that are essential to your plants during their vegetative stage of growth.
$10.99 - $26.95
Grow More® BioCozyme is a specific combination of natural ingredients to help your plants with their day-to-day functions.
$179.95 - $249.95
CAN Max-Fan Pro Series are brand new to the market and are energy efficient exhaust fans that work great in any grow room setup.
Use Super Sprouter Multi-Colored Neoprene Inserts to prevent you new plants from moving around. This will prevent damage and allow them to grow safely.
$7.59 - $15.25
BioAG VAM helps to increase the beneficial relationship between your plants and natural fungi. This is a great solution when transplanting plants, if there is a drought, or presence of soil toxicities.
Hydro-logic Stealth & Small Boy Float Valve fits a 1/4 inch setup and connects simple and quick. Don't worry about overflowing you reservoirs again!
$12.75 - $74.95
RAW Bloom All-In-One is a fertilizer for your plants that is designed to help your plants grow healthier and fuller with a specific combination of nutrients, supplements and other elements.
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!

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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