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!

Mills Nutrients

Remo Nutrients

Featured Products

Unique double ended constructions allows doe maximum optical efficiency and uniformity.
$16.95 - $109.95
B’Cuzz Blossom Builder increases the essential oil production of your plants increasing their size, scent, and flavor when the bloom.
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.

Newest Additions

Roots Organics Seabird Guano is an excellent source of phosphate and calcium to encourage vigorous plant growth.
HydroDynamics Europonic Silicate is the strongest product on the market with 11% Silicon Dioxide, it’s proven to protect your plants from the hottest days of summer to the early frosts of fall.
A new expansion of the Eye PowerVEG line. With four new lamp colors, each designed for a specific stage of your plants growth cycle, we guarantee impressive hobby quality results.
Titan Controls Repeat Cycle Timer is a great solution for hydroponic system watering functions, especially ebb & flow and aeroponic systems.
EZ-Clone’s new 9 site cloning machine is perfect if you’re looking to introduce new growers to the benefits of aeroponic plant cloning.
EZ Clone Classic 128-site features a new leak proof design and an increase in structural integrity.
$16.95
Save 26%
Papa’s Perfect Poop is one of our favorite new products! We know it will be an essential part of your supersoil mixture after the first try.
Down to Earth Oyster Shell is a perfect addition to any super soil blend. OMRI listed!
Down To Earth's Neem Seed Meal is another product you'll want in your super soil arsenal. It's even OMRI Listed!
$16.95 - $56.95
Down to Earth’s Kelp Meal is an OMRI listed product that is sure to be an essential ingredient for any super soil mixtures you maybe working on.
$7.75
Save 14%
Down to Earth's Azomite is the perfect nutrient to add to compost, fertilizer, manure or super soil mixtures. OMRI Listed!
$33.95 - $294.95
Root Cleaner is ideal for soil and coco, and it can be used through your entire growing journey. It even works great at pest prevention!
$9.95
Save 16%
CanaWipes feature a unique cleaning solution combined with durable towels to give you unmatched cleaning power.
$18.50 - $49.95
Remo's Nature's Candy is an authentic blend of Carbohydrates and amino acids that are beneficially of plant development. Resulting in some of the most remarkable growth you will ever have.
$24.95 - $69.95
This precise blend of fossilized organics target the specific areas of your plant that control bud development and assists with the production of essential oils and aromatics, and increasing potency.
$36.50 - $199.95
VeloKelp’s amazing formula is packed with vitamins and multiple seaweed extracts, specifically created to support a thriving garden.

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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