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!

Emerald Harvest

Mills Nutrients

Featured Products

Unique double ended constructions allows doe maximum optical efficiency and uniformity.
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.
The Nextlight Mini LED Growlight is a small bulb that runs on just 150w, the Mini is a powerful LED Growlight that sports the full, highly-acclaimed NextLight full spectrum.

Newest Additions

The MovinCool Indoor/Outdoor Portable A/C Classic Plus 14 unit is the most convenient, easy-to-use grow room air conditioner on the market.
Need an air conditioner you can move anywhere From indoors to outdoors, the MovinCool portable Classic Plus 26 air conditioner is your answer.
?For an air conditioning unit that's compatible with both outdoor and indoor gardens, you can't beat the Classic 40 semi-portable indoor/outdoor model from MovinCool.
Keep your garden cool this year with the MovinCool Indoor/Outdoor Air Cooled Semi-Portable A/C Classic 60 unit.
The Ideal-Air Mega-Split Ceiling Mount Heat Pump is perfect for heating your grow room in the winter, cooling it in the summer, or just maintaining a steady temperature year-round.
$249.95 - $449.95
These mini split interconnecting wire packages are for the Ideal-Air Pro Series Ductless Heating and Cooling. Offered in two different lengths, 25 ft and 50ft,
If you've been looking for a mini split system to heat and cool your indoor grow room, the Ideal-Air Pro Series Ductless Heating and Cooling Mini Splits might just be the right option for you.
This wall bracket made specifically for ductless split systems offers a quick, simple way to get your system's condensing unit out of the clutter and up on the wall.
$9.50 - $38.95
Use Clonex Mist in conjunction with Clonex Rooting Compound to enhance vigorous healthy cuttings with robust root development and elongation of root hairs.
Whether you're an experienced gardener, or you're looking for an easy way to show your kids how to grow plants, the Jump Start Windowsill Heat Mat and Tray Kit is perfect for anyone!
$30.95 - $229.50
?If you're looking for at top-of-the-line-product to stimulate root growth in your crop or flowering plants this season, then look no further than Roots Excelurator Gold from House and Garden.
Not only does this product balance unstable pH levels, but it also contains the perfect combination of trace minerals, ensuring that nothing interferes with the nutrients in your reservoir.
$17.95 - $60.50
For a nutrient rich in organic nitrogen, you can't beat the Down to Earth Blood Meal. A certified organic product, this blood meal provides readily available nitrogen to any plant you've got growing.
Plants like evergreen trees, flowering shrubs, and berries often grow better in a low pH soil, making them a bit more difficult to cultivate than others.
$8.50 - $26.95
If you're looking to enhance early season growth and promote exceptional root development, then the Down to Earth Bone Meal is the soil amendment for you.
?If you've always wanted a comprehensive nutrient line for your plants, but are worried about the money it takes to completely switch to a new group of products, then the 3-Part Kick-Starter Kit from Emerald Harvest is a great option for you.

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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