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

$39.95 - $157.95
BioBizz TopMax is a plant bloom stimulant that helps increase the number of blooms, delivers nutrients to your plants and also increases their flavor!
For amazing results, dip your plant cutting into Earth Juice Rootstock gel and put into a growing media soaked with Rootstock Solution.
Joshua Roth Green Cap Bonsai Cut Paste is for use on Conifers and Azaleas and is very popular with experienced bonsaiists.
Clonex Rooting Gel in a handy single-use package makes a lot of sense…

Newest Additions

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!
Hydro Flow (Ecoplus) Ebb & Flow Fittings Kit has been around for years and is the perfect solution to reduce leaks. The pieces push together to create a tight seal.
Bontanicare Growilla Bud is a premium plant food designed specifically to deliver the nutrients your plant needs to transition to harvest.
Use Botanicare Growilla Veg to give your plants the nutrients they need to product lush, healthy vegetation.
$12.50 - $69.95
Mad Farmer’s M.O.A.B. is an all natural formula that delivers potassium and phosphorous to your plants to deliver higher, denser yields.
$1.69 - $6.99
Using Bluelab pH 7 Solution ensures you pH testing devices are clean, calibrated, and ready to use.
$11.95 - $69.95
Botanicare Pure Blend Tea has the essential, all-natural ingredients needed to give your plants a boost to grow stronger and healthier.
$1.69 - $6.99
Bluelab pH 4 Solution is specifically designed for calibration and allows you to ensure your Bluelab products are working effectively.
The Foxfarm Dirty Dozen Starter Kit has everything you need to give your plants beautiful blooms and keep them growing healthy!
Save 14%
Bountea Root Web is the prefect choice to protect your seeds, trees, and lawn from fungal disease.
Save 15%
Bountea M3 uses nitrogen and other organic minerals to strengthen your plants and increase your plants growth.
$10.95 - $21.50
Use Deer Stopper to protect your plants and shrubs from the devastation that deer, elk, and moose can cause to your garden.
Save 14%
Deer Stopper Barrier Ribbon is the perfect solution for protecting your garden from deer, elk, and moose.
Use Ideal Air Stainless Steel Quick Release Duct Clamps to help put your grow room together with ease!

We spare no expense in our shipping
department to see that your order will reach you in perfect condition - satisfaction and privacy guaranteed! 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. Satisfaction is guaranteed!

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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