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

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.
Save 22%
Grow More® BioCozyme is a specific combination of natural ingredients to help your plants with their day-to-day functions.
FoxFarm’s Bembé™ Sweet & Dandy
$30.95 - $53.95
Max-Duct™ Vinyl Ducting is the flexible and durable solution to help you properly ventilate your grow room.
Get more versatility out of your ballast and reflector with the 10 foot lamp extension cord. Make your lighting system work for you!
General Hydroponics ½” rubber grommets will ensure your DIY hydroponics system won't leak.
Soft Twist Tie Garden Wire is perfect to have around your garden or grow room. Use it to attach plants to support stakes, bend branches and more!
$12.25 - $42.25
Age Old Organics Optimize uses amino acids to help your plants be able to uptake more nutrients during the growing seasons when they are needed most.
Age Old Organics Root Assist helps your plants develop and strong, healthy root system. Perfect for transplanted plants or fresh cuttings.
Age Old Organics Liquid Soil Tracepak is the first hydroponics nutrient products by Age Old. It solves the most common issue that hydroponics gardeners have which is micobutrient deficiencies.
Save 15%
Titan Controls Hades 1 is the perfect product to protect your equipment from power failures and hot starting.
Use this cleaning cloth to rid your lamps, glass, and reflectors from pesky fingerprints.
$16.95 - $56.95
Terpinator enhances your plants aromas, flavors, and pigments by boosting its natural oils and terpinoid.
Use Organic Mechanics Pure Rice Hulls to improve your soils drainage and make your soil blend more porous. This is the perfect substitute for perlite!
Mother Earth BioChar is carbonized material that increases the microbial life and fertility of your soil.
Use the Lightspeed Digital 1000w Ballast to save you HID bulbs. Dim the power to 750 of 600 watts and switch from 120 to 240 volts just by changing out the power cord!

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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