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

$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.
Emerald Harvest is introducing their hassle-free 2-part Kick-Starter Kit, based around their well known Cali-Pro base nutrients.
$169.95 - $297.95
Vitalize is carefully formulated to make your plants healthier, heartier, and more resistant to stress factors.
RAW Cane Molasses is highly concentrated and very economical.
Humboldt County’s Own Emerald Triangle Deep Breath is designed to help boost your plants' growth with its unique honey and vitamin based formula.
Highly concentrated and highly effective, this product contains impressive levels of essential potassium phosphate, vitamins B2, B3, B6, and nearly 20 times the vitamin B1 of any other bloom booster on the market today.
To protect your plants from overheating, and potentially even fire, check out the Titan Controls Zephyr 2 - High Temperature Shut-Off with Delay.
?If you're looking for a digital timer to handle multiple appliances or units in your hydroponic system, lighting equipment, pump, or other large scale gardening operation, then you need the Blueprint BDT-2.
For a timer that can enforce any schedule you set, look no further than the Blueprint BDT-1.

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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Garden Watchdog Top 5 Organic Seeds in stock Hydro for Hunger participant OMRI Listed
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