Choosing what soil/medium to use for growing your marijuana plants is arguably the most important decision you'll make. Choose the wrong blend and you could be signing yourself up for weeks of measuring, flushing, and writing into chat forums for help! Choose the right one, and your experience instead could be filled with sharing photos on Social Media and harvests that seem never ending.
Coast of Maine Aeration Formula provides the perfect blend of washed Coconut Coir and Perlite to help you create your own custom soil. This 70/30 Coir and Perlite mix has been an industry staple for growers for years. Our coir is made from the pith of coconut husks, an alternative to peat-based medias, and is combined with perlite for better aeration and drainage, allowing growers and gardeners to more aggressively feed without worrying about overwatering. Plant directly into this blend for your favorite indoor and outdoor container plants. With its unsurpassed texture and porosity, Coast of Maine 70/30 Aeration formula provides an ideal growing environment.
- 70/30 Coco-Perlite
- Base mix to help you create your own custom soil
- Improves airflow around the root zone
- Made with premium ingredients
For those who want to mix your own soil.
Cultivators have raved about the efficacy of Stonington Blend Grower’s Mix. Many still want to blend and create their own “super soil.” Below you will find everything you need to do just that!
If you'd like a simple, successful experience, choose Stonington Blend Grower's Mix. We've done all the hard work for you! We've taken into account all of the necessary factors for your cannabis plants to perform at their absolute best:
- What is the best pH level?
- What are the water retention requirements?
- What is the best nutrient makeup?
- What is the best timing for the nutrients to release?
- What will ensure we provide the cleanest taste?
- What is the plant's preferred soil texture?
- What is the plant's preferred soil drainage/moisture level?
Coast of Maine's Stonington Blend is a pre-mixed "super soil" that contains EVERYTHING your cannabis plants need for a full grow cycle.
(When growing in 15 gallons of soil or more, YOU ONLY NEED TO ADD WATER!)
STONINGTON BLEND Grower’s Mix - OMRI Listed for Organic Use, Stonington is a complex “super soil” that was designed completely with cannabis plants in mind. Rich in nutrients and formulated with amendments designed to boost budding, blooming and root development, Stonington Blend™ also provides the ideal balance between water retention, soil texture, drainage and aeration in a consistent growing medium. It includes mycorrhizal fungi, a combination of kelp, fish bone and alfalfa meals, worm castings, peat, coir, and lobster compost. On its own, it is enough to feed a single cannabis plant through a full grow cycle in a 15-gallon container. Just add water!
There is no need for expensive nutrients. This blend will save you time and money and give you tremendous results! The very best soil for your backyard grow!
Available in 1.5 cf bags, or in 60 cf Supersacks!
Contact us - for supersack pricing and delivery information.
Successful cannabis plants begin with the best organic soil that growers can buy!
Over the last decade, we keep developing Stonington Blend™ Organic & Natural Grower’s Mix for knowledgeable organic growers concerned with where and how their mediums are made. We are confident that this is the best compost blend we have produced in nearly twenty years of composting marine residuals along the Coast of Maine. Our “Super Soil” grows big, healthy buds. Just add water!
OMRI listed for organic use, Stonington Blend™ Organic & Natural Grower’s Mix is a complex “super soil” that was designed completely with cannabis in mind. It is rich in nutrients, and formulated with amendments designed to boost budding, blooming and root development. Stonington Blend™ also provides the ideal balance between water retention, soil texture, drainage, and aeration in a consistent growing medium. This blend is a rich mixture of horticultural grade sphagnum peat, coco fiber (coir), lobster compost, composted dark bark, dehydrated hen manure, perlite, worm castings, and a mixture of meals (kelp, alfalfa, fish bone), mycorrhizae, and dolomitic limestone to adjust pH.
At Coast of Maine, we know cultivators want to harvest the cleanest cannabis possible. The diversity and density of the amendments we incorporate in Stonington Blend™ Grower’s should enable a cannabis plant to grow to its fullest potential when planted in a 15-gallon container using a water only method. No flushing needed! Choosing the right container for your cannabis plant. When it comes to pots, your cannabis wants one thing and one thing only: a safe, healthy place for root development. Without healthy roots, your cannabis will never thrive. Roots are in charge of water retention, nutrient absorption, anchoring the plant, and also facilitate vegetative growth. All of these functions must be considered when choosing a container.
Autoflower Cannabis Grow Cycle
For a root system to develop and thrive, it will need the following:
- Drainage: Water retention is paramount for healthy plants—without it, your cannabis will wither and die. But too much water will waterlog your plant and lead to root rot, killing roots.
- Oxygen: Plant roots require oxygen to function properly. Choose a container that facilitates enough oxygen for root development without overexposing them to the elements—containers do this though various styles of perforation.
- Nutrients: Roots require optimal conditions for nutrient absorption to occur. This includes pH balance, optimal temperatures, and nutrient availability.
- Space: Roots need plenty of space to branch out. A container that is too small will cause it to become rootbound and choke the plant.
Why choose autoflowers over the regular plants? Autoflowers are small, they grow fast, produce big yields, and have amazing resistance to mold, pest and insects, plus they can flower under any light cycle. Apart from the short strains, there are also bigger, heavier auto strains that will still flower automatically, and these are called the “SUPER” autoflowering plants. - Typically auto plants are going through veg cycle weeks 1-3 or 4 - Typically flowers between weeks 5-8 or sometimes 12 depending on strain.
Veg Feeding
3-10 gallon pots = 1/4 cup Stonington plant food once, at start of week 3 15-20 gallon pots = 1/2 cup Stonington plant food once, at start of week 3 Add Stonington Blend™ Organic Plant Food then scratch or scrape into the top few inches of the soil and provide moderate water.
Flower Feeding
3-10 gallon pots = 1/4 cup fish bone meal once at start of week 5 or 6, if you go 12 weeks provide a second feed at start of week 9 or 10
15-20 gallon pots = 1/2 cup fish bone meal once at start of week 5 or 6, if you go 12 weeks provide a second feed at start of week 9 or 10
Add Fish Bone Meal then scratch or scrape into the top few inches of the soil and provide moderate water.
Click here to download Auto Flowering Instructions Click here to download Nutrient Feeding Schedule
Click to view our Cannabis Grow Catalog
Shop Now for Cannabis Essential Products:
A blend of 70% Coir and 30% Perlite has been an industry staple for hydroponic growers for years. Coast of Maine developed our unique blend by adding lobster meal and crab shell meal and kelp meal to this popular growing media. This is a base mix to help you create your own custom soil.
Available in 1.5cf bags and 60cf supersacks!
$26.99
Created specifically for growing Cannabis. Rich in nutrients and formulated with amendments designed to boost budding, blooming and root development. Designed for high-performance growing in containers and large pots. This blend incorporates sphagnum peat moss, coir, perlite, compost, worm castings, fish bone meal, lobster and crab shell meal, kelp meal, alfalfa meal and mycorrhizae. For best results, grow in 15-gallon containers. OMRI listed.
Available in 1.5cf bags and 60cf supersacks!
$36.99
Bar Harbor Blend Organic & Natural Potting Soil is the perfect soil for potting plants, flowers, herbs, or vegetables in pots, hanging baskets, raised beds, planter boxes, or any other growing container. The carefully formulated blend provides balanced water retention, drainage, and aeration to promote long and lush growth—whether it's for that single special flower on your counter or a greenhouse full of your favorite potted plants.
Available in 8qt, 16qt, 1cf, 2cf, and 60cf tote
from $9.99 - $22.99
Quoddy Blend Organic & Natural Compost with Lobster & Crab is our locally renowned “seafood” compost. Its crustacean shells are nurtured in our home state’s cold, dark waters, granting the botanical benefits in this multi-use mix that first established Coast of Maine’s fame. This precisely-balanced formulation helps revitalize soil and provides the needed balance of water retention, drainage, and aeration. It’s ideal for maintaining gardens, beds, and borders, and nurturing the robust growth of vegetables, flowers, and foliage.
Available in 2cf, and 60cf tote!
from $7.99 - $26.99
Stonington Blend™ Organic Plant Food with Lobster, Kelp & Worm Castings (5-2-4) Made with lobster and crab shell meal, fish meal, kelp meal, and worm castings. This exceptional fertilizer will super charge the soil, giving all your plants a significant boost. It is also high in calcium (4%) and a range of macro and micro-nutrients to help improve plant vigor!
Available in 4lb bags
$18.99
A rich blend of digested organic matter left behind by earthworms. Odorless and finely textured castings enrich soil with active biology and plant ready nutrients. Improves water retention. Use to brew compost tea. OMRI Listed.
Available in 8qt bags
from $18.99 - $35.99
Promotes budding and blooming. This concentrated fertilizer also enriches the soil with plant-ready minerals, giving your plants a significant boost! Great for greenhouse and hydroponic systems and both indoor and outdoor applications.
Available in 1qt
$20.99
An exceptional organic fertilizer ideal for budding and blooming plants. Made from dehydrated fish bones, it is an excellent natural source of phosphorus, calcium, and nitrogen. OMRI Listed.
Available in 3lb bags
$17.99
Made entirely of lobster and crab shell meal. This is the ideal organic fertilizer for outdoor containers, vegetable, herb and flower gardens. Natural nitrogen and calcium help promote strong stem growth, green foliage, and vigorous roots. OMRI Listed.
Available in 4lb bags
$17.99
100% dehydrated Norwegian Kelp (common seaweed) improves crop yields. It contains over 60 micronutrients. Use around trees and shrubs, on lawns and in garden beds, or to top-dress containers.
Available in 4lb bags
$17.99
Castine Blend Organic & Natural Raised Bed Mix is specially formulated for robust raised-bed garden growth during the plant life cycle. This ready-to-use blend is enriched with worm castings, mycorrhizae, biochar, greensand, kelp meal, and lobster and crab shell meal. Its dynamic mix of ingredients provides the structure, water retention, drainage, and aeration for growing strong, vigorous vegetables, herbs, and flowers in raised beds, planter boxes, or any other container gardens. That broad range of benefits supports the biodiverse living soil that nurtures the richest results.
Available in 1cf and 2cf bags and 60cf supersacks!
from $12.99
Need a more economical soil for your outdoor grow? Try our Castine Blend!
Make your outdoor grow more economical and explosive with our OMRI Approved Castine Blend Organic Raised Bed mix. If you are using raised beds or supersized containers for your outdoor grow, Castine Blend Raised Bed mix may be the right choice for you!
This ready-to-use blend is enriched with worm castings, mycorrhizae, biochar, greensand, kelp meal, and lobster and crab shell meal makes this 2 cubic foot bag of microbial diversity, the perfect base growing media for cannabis. Add our fishbone meal two weeks before flower, and get ready for the harvest of a lifetime! ... Also perfect for no till growing!
Frequently Asked Questions
Q: When germinating my seeds, can I use the Stonington Blend Grower’s Mix in a solo cup and transplant, or do I need to use the seed starter?
A: We have heard from growers that they have had success with germination in Stonington Blend, but we really don't recommend it. Seeds are very sensitive to nutrients, and germinating them in a nutrient-rich environment can actually cause them damage. Our seed starter (Sprout Island Blend) was specifically designed for germination and rooting plant cuttings. It has only a mild starter charge from the worm castings, mycorrhizae and kelp, so the seeds won't get overwhelmed.
Q: Do I have to pH my water?
A: In most cases, no, you don’t have to pH the water. But, it is helpful to know if it is at least in the target range, because the pH level outside of the preferred range can adversely affect how your plants take on nutrients/minerals, and how easily they are made available to the roots. Cannabis likes slightly acidic soil. (preferably 6.0-6.8 - We target Stonington Blend to be a 6.5 pH) Ideally you would want your water to be in that range too. That way you can confidently know your plant is getting all of the nutrition it needs from our mix. A more useful way to gauge what is actually going on in the soil is to test the pH of your run-off rather than the pH of the water you put in. The run-off will contain any salts that might be building up in the soil and alert you to possible problems before they occur. Tip If you are using tapwater, let it sit in a bucket or reservoir for a few days to allow it to dechlorinate, then check the pH to make sure it is within the required range.
Q: Is this a “hot soil” for the base of the plant?
A: No. Because of Coast of Maine’s composting techniques and the way we allow the amendments to settle before we bag the soil, Stonington Blend Grower’s Mix is gentle enough to be right up against the plant.
Q: Can you ship Stonington to Canada?
A: At this time we do not ship outside of the US.
Best Cannabis Soil EVER. Best Value Grow Mix. Best Super Soil for Marijuana. Better than Fox Farm Ocean Forest. Coast of Maine is a boutique soil mix brand. Their Stonington Grower’s Mix is intended for growers that don’t want to spend additional money on pH monitors and associated products. Coast of Maine’s Stonington Grower’s Mix is a stand-alone organic soil mixture that contains mycorrhizae, kelp meal, fishbone meal, lobster compost, alfalfa meal, and worm castings. This organic soil mix is jam-packed with everything your plants need to thrive. And, all of these high-quality ingredients deliver a hearty harvest of aromatic and cannabinoid-rich flowers come harvest time. Although Coast of Maine’s Platinum Grower’s Mix is expensive, it performs exceptionally well. This is one of the best soil mixes for cannabis we’ve seen, and it’s highly suitable for both beginners and professionals alike.High-quality organic ingredients. No need to pH adjust. No supplements needed. Grows cannabis plants from seedling to harvest.
