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Garden Composter by Sun-Mar


Your Go-To Outdoor Composting System

Looking for a durable, efficient, and user-friendly outdoor compost bin? The Garden Composter Series by Sun-Mar is a great option for reducing your household waste and turning organic materials like yard waste, kitchen scraps, and food waste into rich, usable compost.

With two size options, the Garden Composter 200 and the Garden Composter 400, you can pick the ideal setup for your garden, home, or vegetable scraps output. Both models use Sun-Mar’s Autoflow® technology and a double-drum composting system to make your decomposition process easy, effective, and continuous.

Picture of Sun-Mar Garden Composter

Why Garden Composters are the Best Compost Bins for Outdoor Use

  • Efficient Continuous Composting: No need to wait for a full compost pile to finish. Sun-Mar’s unique Autoflow® system allows compost to naturally move through the chamber and exit through the output door.
  • Durable for All Seasons: Made with UV-stabilized, partially recycled polyethylene, both models withstand heavy rains, high temperatures, and everyday wear and tear.
  • Pest-Resistant and Odor-Controlled: With a sliding door, sealed construction, air vents, and good drainage, the design prevents fruit flies, rodents, and unpleasant odors.
  • Great for a Wide Range of Organic Materials: Easily compost vegetable scraps, grass clippings, coffee grounds, dead leaves, woody material, and even kitchen waste like paper filters and tea bags.
  • Eco-Friendly Gardening: Convert organic waste, food scraps, dead leaves, and grass clippings into nutrient-rich compost to reduce reliance on chemical fertilizers and lower methane emissions from landfill waste.

Sun-Mar Composter Model Comparison

Garden Composter 200

Compact and Effective for Everyday Use

The Garden Composter 200 is perfect for households with moderate composting needs. Its manageable size and durable construction make it a solid choice for turning everyday food waste and garden waste into nutrient-rich compost for your vegetable garden or garden beds.

Key Features:

  • Autoflow® continuous composting system
  • Manually rotated for easy aeration
  • Lockable sliding input door
  • Ventilation and drainage ports
  • Pest-resistant design

Specifications:

  • Drum Volume: 195 Liters (Approx. 6 bushels or 50 gallons)
  • Height: 31″
  • Depth: 24″
  • Length: 34″
  • Product Weight: 38 lbs
  • Box Dimensions: 24″ x 24″ x 32″
Sun-Mar Garden Composter 200

Garden Composter 400

Higher Capacity, Extra Convenience

Need to handle a larger amount of waste? The Garden Composter 400 offers the same durability and composting efficiency as the 200, but with double the capacity—plus a crank handle for easy turning and wheels for portability. It’s ideal for families or gardeners looking to manage more household waste, kitchen scraps, and yard waste on a regular basis.

Key Features:

  • Autoflow® continuous composting system
  • Crank handle for effortless rotation
  • Large lockable sliding door
  • Multiple air and drainage ports
  • Pest-resistant design

Specifications:

  • Drum Volume: 366 Liters (Approx. 11 bushels or 100 gallons)
  • Height: 36″
  • Depth: 28″
  • Length: 42″
  • Product Weight: 60 lbs
  • Box Dimensions: 46″ x 29″ x 29″
Picture of Sun-Mar Garden Composter 400

Start Your Composting Journey the Easy Way

Whether you're new to the idea of composting or looking for a top pick to manage your organic waste, the Sun-Mar Garden Composter 200 and 400 offer durable, effective, and eco-friendly solutions for your home. Turn your own compost into black gold for your garden—without the hassle of traditional wooden bins, worm bins, or smelly indoor composters.

Sun-Mar Garden Composter FAQs

Can I use these composters year-round?

Yes! Both models are built for outdoor use and can withstand varying weather conditions, from heat to heavy rains.

What kinds of waste can I compost?

You can compost vegetable scraps, fruit peels, coffee grounds, paper filters, tea bags, grass clippings, dead leaves, woody material, and more. Avoid large amounts of dairy products, meat, or oily foods.

How does the Autoflow® system work?

As the material breaks down inside the double-drum system, finished compost naturally moves toward the output end and can be removed without interrupting the composting process.

Do the bins smell?

With proper airflow and drainage, these bins minimize odors. Ventilation ports help with odor control and efficient breakdown of organic matter.

What's the best model for a small backyard?

The Garden Composter 200 is compact and perfect for smaller spaces with moderate composting needs.

Free shipping on a variety of products!

As soon as your product is on its way out of the warehouse, we will email you the tracking number for your shipment. 

Free Shipping on a variety of products! If the product you're interested includes free shipping, it will be indicated on the product page. Otherwise, shipping costs will be calculated based on the size of the package and your location.

No Risk Damage Policy

Easy Returns

For more information about Shipping and Returns CLICK HERE

Price Guarantee

We care about our customers and want to offer the best prices available for our top notch products.

Conditions of our 100% Price Match Guarantee:

  • The item must be purchased from us before we can match it

  • Buy one, get one free offers and Rebates are not eligible

  • The item must be in stock on the competitors website

  • The competitor must be an online store, not a retail location

  • The website can't be a discounter or auction website ( such as eBay, overstock, etc.)

  • The company must be an Authorized Retailer of the product in question

  • The Price Match Guarantee is based on the final price of the product including shipping and taxes

  1. We care about you. We don't want to just sell you something and never hear from you again. We know that in order to get return business, we need to provide not only good products, but good customer service.
  2. We're a family owned business! My wife and I run Wild Oak Trail, and when you buy from our store, you're actually making a difference to our family!
  3. We LOVE being prepared. In uncertain times, it feels really good knowing that we have backup power, food and water ready to go!
  4. We source QUALITY. We expect every one of our customers to be happy with their purchase and tell their friends and family about it!