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.
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

$6.75 - $16.95
Looking for the perfect, plump, juicy tomato Well Tomato-tone organic fertilizer from the folks at Espoma can help you produce it!
$11.95
From the folks at Espoma comes a superior enriched potassium source—Espoma Potash.
Chapin's new and improved, heavy-duty, commercial quality- Premier Pro Extended Performance Poly Sprayer has a 1 gallon capacity.
To harvest the ideal yield you're looking for this year, your plants need extensive root systems to support bigger, healthier, and more vital plants.
$11.95 - $44.95
?Foliar feed your flowers, fruit or veggies with Spray-N-Grow and you'll see amazing results! Spray-N-Grow is a micronutrient complex, cultured in a water base, that acts as a biocatalyst.
$21.95 - $69.95
?Microbe Life Nourish-L is a unique, water soluble, liquid humate derived from highly decomposed organic humus deposits. It contains a combination of naturally occurring microorganisms that help to maintain both appearance as well as the vigor of vegetables and plants.
?Microbe Life Foliar Spray and Root Dip contains Ecto and Endo Mycorrhizal Fungi that live on the roots of your plants to form a healthy symbiotic relationship.
$9.95 - $21.95
?Espoma Organic Traditions Rock Phosphate is a 100% natural source of phosphorus. Plants require this nutrient for healthy root development and for fruit and flower production.
$7.95 - $27.95
Espoma Organic Traditions Bone Meal is an all natural source of organic phosphorous and nitrogen.
$8.95 - $37.95
Espoma Organic Traditions Dried Blood is a safe source of organic nitrogen.
Simply put, Selectrocide is the absolute best all-purpose disinfectant on the market today for growers of any kind.
If your plants are entering into the early flowering stage of growth, and you want to do everything you can to ensure you get the massive yield you always wanted, it's time for State of Emergency.
Converge Horticulture, a calcium silicate based media amendment and media conditioner is exactly what sustainable nursery and horticulture growers need to rebalance soilless substrates.
NuHumic WDG from Hurricane Hydroponics is the ultimate humic acid supplement on the market today.
?If you're looking for a quality supplement that's guaranteed to give you stronger, more resilient plants, then Storm Surge Silica from Hurricane Hydroponics is the supplement you want.
If you're concerned your flowering or mature plants are suffering a nutrient deficiency, a supplement like Hurricane Cal-Mag might just be the solution you need.

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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