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.
NEW for 2023
Stonington Blend™ Organic & Natural Aeration Formula – A blend of 70% Coir and 30% Perlite has been an industry staple for hydroponic growers for years. At Coast of Maine, we have developed our own unique blend by adding lobster meal and crab shell meal and kelp meal to this popular growing media. The perfect base mix to help you create your own custom soil.
- 70/30 Coco-Perlite
- Enriched with Lobster Meal & Kelp Meal
- 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 Premium 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
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.
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!
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!
Our great all-purpose potting soil is made with sphagnum peat moss, compost, perlite, lobster and crab shell meal and kelp meal. It is designed for potting indoor and outdoor container plants. Water and fertilize less with this nutrient rich, compost based potting soil. OMRI Listed.
Available in 8qt, 16qt, 1cf, 2cf, and 60cf tote
A rich mixture of blended sphagnum peat moss, compost, aged bark, perlite, kelp meal, lobster and crab shell meal, worm castings, and mycorrhizae. Designed specifically for germinating seeds and rooting cuttings. OMRI Listed.
Available in 8qt, 16qt, 2cf, and 60cf tote!
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! OMRI Listed.
Available in 4lb bags
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
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
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
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
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
An enriched blend of fully cured compost, sphagnum peat moss, dehydrated poultry manure, lobster and crab shell meal, greensand, biochar, worm castings and mycorrhizae. Great for growing vegetables, herbs, and flowers. OMRI Listed.
Available in 1cf and 2cf bags and 60cf supersacks!
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!
A balanced blend of manure compost, worm castings, lobster and kelp meal, mycorrhizae, greensand and biochar this 2 cubic foot bag of microbial diversity is 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.
Comments (41)Leave a comment
Ducarmel legal jr
Love using this soil. Has everything i need all in one bag. Great product
What PH level is best for watering? I see target PH is 6.3. What PH water should be used going in?
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.
I see when switching to flower you reccomend the Fish Bone Meal. I noticed this additive doesn’t have a significant amount of potassium if any. Is there any substitute for ‘K’ you offer or is the Fish Bone Meal sufficient to bring cannabis from flower through harvest?
Hi Jalen, The fish bone meal should be enough to get the job done, but we also recommend that you topdress with compost or earthworm castings when feeding with fish bone meal to provide a potassium boost in flower stage.
What is your advice with auto flowering seeds and stonighton blend?
While we have heard from several growers that they have had great success with germination in Stonington Blend, 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.
Great product! What is your best advice when switching over indoor plants to flower? I have heard some growers use the Quoddy Blend Lobster Compost, scratch in two inches into the top and water. When would be the best time to do this and is there anything else I should add for better results?
Hi, we recommend our fishbone meal for that. As for the timing, it would depend on your container size. Follow the feeding schedule on the chart and you should be all set.
What is your advice when flowering Cannabis? Any additional products that need to be used alongside the Stonington Blend?
Hi, again, it depends on your container size. For an extended flowering stage, we recommend fishbone meal.
Thank you! This is super helpful! Sorry about the double post!
I see in the comment above you say your stonington blend is ph to 6.5 and say ideally you want to water with a ph of around 6.5. What is the best ph down for this organic system if any is needed at all? I use tap water and typically it is between 7.2-7.4 ph. I plan on using coast of maine organic plant food as well as earthworm castings and fish bone meal
Good afternoon. If I can’t find your Stonington Blend but found Bar Harbor potting mix and your lobster compost can I mix those 2 and then your seed starter for Photo and autoflower seedlings
Hi Ricky, While we don’t have a specific recipe for that combination you should be fine. For additional information please send at email to firstname.lastname@example.org.
This is what I was told.”Order these three. Blend the Quoddy and Bar Harbor 50/50 with a tablespoon of the STPF. Top dress with the STPF every 30 days.” (STPF=stonington plant food)
I grow from clone to harvest with this stonington blend indoors in five gallon fabric pots under LED lights and I don’t add anything except water! Perfect every time. Coast of Maine you are the best!!
Thank you Michele!!! We love to hear it! Our team works so hard to ensure every bag is a perfect blend!!!
I am planning on buying your STONINGTON BLEND Premium Grower’s Mix and using a 25 gallon living soil fabric container for indoor cannabis tent grow. Would I need to increase the amount from your chart to 3/4 cup of Stonington Plant food and 3/4 cup of fish meal if I end up needing to add nutrients? Can this soil also be used as a base for no-till living soil like your organic raised bed mix?
This is Jimmy from the comment above. Can I just plant my cannabis seed directly into my 25 gallon container of STONINGTON BLEND Premium Grower’s Mix?
Should I water until I get run off with this soil?
Technically, you can plant the seed directly into 25 gal pots, but it would be better to start in 1-3 gallon pots and then transplant as the plant grows. (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. Best if you start your seeds in that, then transplant into the Stonington)
Yes. 3/4 cup per feed would be correct.
I have 3 plants I am growing in pro- mix mixed with 1/2 cup of Stonington Blend mix. When 2 weeks are up do I feed it again, it is in veg. Can I over feed them.
HI Kathy, We are assuming you are using Stonington Blend Plant Food, correct? (not Stonington Grower’s mix soil) What size container are you using?
Curious about re-ammending soil with your EWC and dry amendments to use for another grow cycle. My desire is to run one bag’s worth in containers, pull root balls after harvest and then re-ammend the soil with Coast of Maine kelp, alfalfa, and lobster meals as well as earth worm castings and compost. Could you provide advice on this? amounts of each amendment to add to one-bags worth of the stonington blend? and how long to allow it to sit and “cook” before planting fresh seedlings? any info would be great!
(assuming these are ~1.5-2cf pots)
1. Don’t let the soil ever dry all the way out between plantings (decreases your microbial population. Also, it is hard to rewet when it completely dries out)
2. To each pot, add 4-5 cups of worm castings with 1 cup of Stonington Plant Food (could also sub for a combo of lobster and kelp meal @ ½ cup each)
3. Mix it well and add a little water if it is really dry. Let it sit for 7-10 days keeping it as moist as you would if a plant was growing in it.
4. Transplant. (If growing from seed in these pots, cut ½ the fertilizer listed above) Or you can use our Sprout Island Seed starter to germinate your seeds, and transplant the seedlings.
Used the platinum blend in 15 gal grow bags. Amazing results. Ended up with beautiful harvest. I did supplement towards end of season with bloom supplement. Looking forward to spring!
Good product! I have seen a lot of reviews about this one and I am convinced that it is effective. I’ll try to use this one soon and i’ll give a review here. Thank you for sharing.
Hi I’m confused. I’ve read all about your product but in one place it says that this product will feed the plant throught the whole life cycle but then you have the chart lower on the page that gives instructions for adding nurtients. I just don’t want to add too much if I don’t have to. Can you clear this up? I’m in 5gal smart pots
Hi Jake, in a 15gallon pot, Stonington on its own is enough to feed a single cannabis plant through a full grow cycle. When smaller containers are used, there just isn’t enough nutrition available, so supplemental feedings are needed. That is why we provide the feeding schedule/nutrient chart. Hope that makes sense. 🙂
I’m growing autos and I was wondering if I should amend as above or reduce to recommended ‘dose’ by 1/2 if I am growing in a 5 gallon pot. Thanks!
Hi Frank, That should work great! Because they are 5 gallon auto flower plants, reducing the feeding in half should be an ideal amount without over feeding nitrogen.
Hi.I am also growing autos in 5 gallon pots.How did your schedule and dosage go if you don’t mind me asking.First time grower
Hi everyone.Can anyone possibly give me some advice for the feeding schedule for a 5gal autoflower running stoningham and have the feet and fishbone meal,wormcastings and liquid squid.Im a first timer,Journaling and just trying to pin this down So far I transplanted 2 3 days ago,should I give them anything.Only thing I’ve done is the first watering until small runoff?Do I always keep the soil a little moist?I’ve been told better to under then over.
Using the lobster compost and earth worm castings as for tea w two stone aerators. Growing in coco all organic…any advice?
Hi John, Our earthworm castings are always great to use as a tea, (we actually have a tutorial video on our youtube page you can watch) but I’m not sure about using our lobster compost as a tea. I haven’t done that. As a topdress, yes! But not as a tea. If you do end up trying it, let us know how it goes!
Hey, Can you provide the amendment feeding schedule for autoflower cannabis in 3 gallon smart pots? I want to be prepared for week 3-4 when I need to amend the soil correct? They are in week 2 and seeds were planted straight into your Platinum Growers Blend without issue. Can I use neptunes harvest and if so do you have recommendations for that with your soil? Thank you for a great product!
Hi, for the 3 gallon pots, you should just follow the 5 gallon pot on our feeding schedule. Our products obviously work best with our soils, but if you want to use Neptune’s Harvest that should be totally fine! (I just have never used those products so I can’t really provide any quality tips for feeding,) but, I would just say feed lightly and make sure you recharge the soil in week 4 with something that has phosphorus and nitrogen.
Could or would the buds be bigger if you did ad something or are they massive to begin with,I’m just curious
The response from must of our growers is that using Stonington as directed gives them incredible results.
Wow, I had no idea that Coast of Maine had products specifically designed for growing cannabis! I’m definitely going to have to check those out. It’s great to see companies catering to the needs of cannabis growers and providing high-quality products to help them succeed.
Thanks for sharing this info!
Ps : Happy Newyear 🙂