SucSeed® Organic Seed Starting Medium

SucSeed® Seed Starter: The Ultimate in Seed Starting™ is an exceptional organic seed starting medium. Milled long fibered sphagnum moss has been recommended by professionals as the only renewable seed starter.  Made from Wisconsin-grown long fibered sphagnum moss plant, SucSeed® is free of peat, which can contain harmful damping-off bacteria that could kill your seedlings. SucSeed® Seed Starter gives your seeds the best chance of achieving the highest seed germination rate available.  244 cubic inch (4L) package.

  • All organic seed starting medium, no artificial ingredients added
  • Proven highest germination rates
  • Helps control overwatering, the leading cause of seedling death
  • Recommended and used by professional horticulturists for over 50 years
  • Encourages strong root growth, resulting in healthier and sturdier plants
  • Natural and renewable medium
SKU: ML0003 Category:



The Best Seed Starter

Mosser Lee’s SucSeed® Seed Starter: The Ultimate in Seed Starting™ is an exceptional organic seed starting medium made from the renewable Sphagnum Moss plant. Unlike other seed starters, with SucSeed®, you can assure yourself that you will achieve the highest rate of seed germination available. We back this up with a money-back guarantee! No other seed starter does that either!

Why Starting Seeds with SucSeed® Seed Starter Works.

SucSeed® Seed Starter is not your ordinary peat-based seed starter. Because SucSeed® is made from the Wisconsin-grown sphagnum moss long fiber plant, it is free of dirt and decomposed peat, which can contain or attract harmful bacteria that could devastate your seedlings. The sphagnum moss plant is uniquely adapted as a seed starter because of its two important attributes. First it holds and retains 20 times its weight in water. This is important because in order for seeds to properly germinate, they need a moist environment that should never dry out. SucSeed® retains water for an exceptionally long time, longer than any other seed starter. That means your seeds have a better chance of germinating, even if you miss a few watering.

The second unique SucSeed® Seed Starter benefit for seed starting is its natural anti-bacterial property that protects tender seedlings from deadly pathogens. Many studies have been conducted on why the undercomposed sphagnum moss fiber retards pathogens. The most likely research suggests that sphagnum starves pathogen’s need for its nitrogen-based food.

Find out more about the history and sustainable harvesting of Sphagnum Moss

Easy Seed Starter for Beginners

Tested Against All Consumer Seed Starters

Whether for a professional nursery or your back yard garden, you should not have to risk that your seeds won’t germinate successfully. Different seeds have varying germination rates, but our professional-grade seed medium ensures top germination results faster than peat-based seed starting mediums making it a perfect choice for beginner gardeners to seasoned professionals. In one set of tests, SucSeed® Seed Starter germinated Lupine seeds faster and achieved a germination rate of 97% while a leading seed starter only germinated 75% of the seeds from the same seed package. We also tested a variety of garden, flower and commercial seeds against the leading consumer seed starters and in all cases, it outperformed its competitors. Seeds sprouted faster and more seedlings germinated (higher yield) with SucSeed® Seed Starter. In many cases, the root growth systems showed stronger development (white roots) with SucSeed®.

Member Tested and Recommended for Seed Starting

National Home Garden Club

When put to the test by very experienced home gardeners, our seed medium proved superior in germinating all types of seeds – from tomato hybrids to palm trees. We received the endorsement and recommendation by National Home Garden Club members. They liked the ease of use, no mess and the light weight of SucSeed®.

Organic Seed Starting Mix

SucSeed® is Organic and Renewable.

The sphagnum plant grows wild and is harvested from wetlands. No type of fertilization, herbicide, insecticide or other product is applied to grow sphagnum moss. Mosser Lee’s harvest methods ensures the reproduction of the plants in the same wetland, which have been harvested for over 150 years. Sphagnum reproduces by sporing seeds and reach harvestable growth after 7 to 10 years.

Use SucSeed® and feel confident that you are adding the best

Full Money Back Guarantee

Professional nurseries do not take the risk that their seeds will not germinate, and neither should you. Starting seeds indoors should be enjoyable and productive. We stand behind SucSeed® with a full money back guarantee if in-dated same year seeds do not germinate according to seed packet or manufacturer germination rates. Details of our guarantee are listed on the package.

Complete directions are printed on the bag.  SucSeed® Seed Starter is available in a 244 cubic inch (4L) bag and 2-bushel sack.


Additional Information

Sphagnum Moss for Seed Germination Seed Starting

What customers have to say about our SucSeed™ Seed Starter:

“I like how it maintains the medium moist, but not damp or overall wet. The seedlings look healthy and strong, unlike other products I’ve used where the seeds grow thin and weakly.” – L. Roman – Maywood, Illinois

“I would recommend this product because more of my seeds grew compared to my regular seed starting medium and the seedlings were much bigger and healthier looking.” – C. Morrison – Manchester, Connecticut

“I planted 24 seeds which were supposed to take 6-10 days to germinate. The vast majority of the seeds had germinated on the fourth day. All seeds that did germinate (22) did so by the seventh day. Easy to use with fast, prolific germination. Much better, more of the seeds germinate and they germinate faster than the package states.” – A. Neulander – Newport News, Virginia

“Excellent product – all seeds germinated within 10 days. Highly recommended.” – K. Haugeto – Skillman, New Jersey

“I like this product better than ordinary potting mix. You can use it right in your kitchen without all the mess, plus no dirty hands. I look forward to having herbs this winter. It was easy to use when mixed with water, plus it’s organic. This product did very well because it’s organic and when you mix it with water it goes a long way compared to the other product I use.” – D. Mays – Troutville, Virginia

“The seeds germinated within 12 days. All 28 seeds were out and thriving and even still the plants are doing amazing. Amazing, nothing can compare!” – S. Simons – Phillipsburg, New Jersey

“Everyone should use the product. The results will amaze you.” – R. Falco  Chicago, Illinois

“Excellent growth of seeds with no fungus appearing, holds moisture very well so you don’t have to watch plants for dry out and wilt. 100% better than other seed starter mediums. No fungus produced!” – A. Kraft – Wayne, New Jersey

“I was stunned when I had more than 100 lettuce plants that appeared in just three days. There was no damping off with my lettuce at all. I usually use peat pots but this product produced a more successful results” – J. Henry – Cockeyville, Maryland

“I was amazed that the seeds started to germinate by the third day. Plus, it was very easy to mix and place in containers and the use of less water. Planted five seeds in each of basil, thyme, dill, sunflowers. All germinated. This product started a lot faster and seemed to produce more at faster rate.” – P. Vallely – Hamilton, New Jersey










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