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Custom Blended Soil Mixes

At North Bay Materials, we deliver custom blended soil mixes designed for thriving gardens, raised beds, and landscape installations across Marin, Alameda, Sonoma, San Francisco, San Mateo and Contra Costa counties. Each mix is carefully formulated using premium composts, organic fertilizers, and mineral amendments to ensure ideal balance, drainage, and fertility for every growing condition. Whether you need a lightweight Potting Mix for planters in Mill Valley, a nutrient-rich Super Organic Mix for vegetables in Orinda, or a structural Bioretention Soil Media (BSM) for stormwater projects in San Rafael, our locally blended soils are ready for fast, professional delivery straight to your home or jobsite.

blended soil mix used in a garden planter box

Custom blended soil mixes are professionally formulated combinations of organic and mineral ingredients—such as compost, peat, rice hulls, pumice, gypsum, manures and natural fertilizers—designed to achieve specific performance goals for planting and landscape applications. Unlike basic topsoil or fill dirt, blended soils are engineered for optimal drainage, aeration, moisture retention, and nutrient availability. Each recipe is tailored to the needs of different environments—like raised beds, planters, vegetable gardens, or bioretention systems—ensuring plants receive the right balance of air, water, and fertility for healthy, sustained growth.

Available Additives for Custom Blended Soil Mixes

  • Biochar

  • Washed Sand

  • #2 Washed Sand

  • Concrete Sand

  • Screened Top Soil

  • Root Zone Sand

  • Steer Manure

  • Chicken Manure

  • OIM Poultry

  • Rice Hulls (OMRI)

  • Composted Rice Hulls

  • Coconut Coir

  • Recycled Compost

  • Fir Humus - Nursery Quality (0” - 1/4”)

  • Fir Humus 0-1/8 Dark Fine

  • OIM Compost

  • Sawdust

  • Sawdust - Nitrified

  • Potting Soil

  • Pumice 3/8” X 1/16”

  • #1 Pumice 3/8” Minus

  • #3 Pumice 7/16” X ¼”

  • Cal Phos Rock Phosphate

  • Nitroform (38-0-0)

  • Crushed Red Lava Rock 5/16” Minus

  • Crushed Red Lava Rock 1/8” Minus​

  • ​​Kelp Meal

  • High N Bat Guano 7-3-1

  • Blood Meal 13-0-0

  • Fish Bone Meal 4-14-0

  • Granulated Organic Fertilizer (9-3-7)

  • Bat Guano 0-7-0

  • Fish Meal 9-4.5-0

  • Greensand

  • Feather Meal 12-0-0

  • Bone Meal 2-14-0

  • Alfalfa Meal 2.5-0-2.5

  • Crab (Crustacean) Meal

  • Dolo-AG OMRI Dolomite

  • Gypsum

  • Grow Power Plus

  • Grow Power Flower & Bloom

  • Ammonium Sulfate 21-0-0

  • Urea (46-0-0)

  • Triple Super Phosphate 0-45-0

  • Potassium Sulfate

  • Calcium Nitrate

  • Potassium Nitrate​

  • ​Classic Royal 15-15-15

  • Best 6-24-24 XB

  • ​Iron Sulfate 21%

  • Oyster Shell Lime

  • Granular Soil Sulphur

  • MonoDicalcium Phosphate 0-46-0

  • Apex 16-5-9

  • Apex 23-6-12

  • Apex 14-14-14

  • Apex Micronutrient

  • Therm X Yucca Extract

  • Cascade Minerals

  • Vermiculite (Medium #3, Coarse #2, and Fine)

  • Perlite (Medium and Horticulture Grade)

  • Heritage Organics Worm Castings

  • Worm Castings

  • Walk on Bark

  • Mini Mulch (0-1” Fir)

NOTE: Custom Soil Blends require 10 cubic yard minimum order + lead time of +/- 1-2 weeks.

Frequently Asked Questions – Blended Soil Mixes

Q. What is a custom blended soil mix?

A custom blended soil mix is a professionally formulated combination of compost, organic matter, and mineral amendments designed for a specific application—such as raised beds, planters, vegetable gardens, lawns, or stormwater systems. Unlike basic topsoil, blended soils are engineered to provide proper drainage, aeration, moisture retention, and nutrient balance.

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Q. How do I know which blended soil mix is right for my project?

The right blend depends on how and where it will be used. Raised beds and vegetable gardens typically require a nutrient-rich, well-draining mix, while planters often benefit from lighter blends with added aeration. Bioretention and bioswale projects require engineered soil media designed for infiltration and filtration. If you’re unsure, our team can help recommend or create a mix based on your project details.

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Q. Can I customize my soil blend with specific additives?

Yes. We offer a wide range of organic and mineral additives—including composts, pumice, sand, biochar, manures, fertilizers, and soil conditioners—to fine-tune drainage, fertility, structure, and performance. Custom blends can be adjusted for plant type, soil conditions, and environmental requirements.

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Q. Are your blended soils organic?

Many of our blended soil mixes can be made fully organic using OMRI-listed inputs. If organic compliance is important for your project—such as vegetable gardens, vineyards, or certified organic landscapes—let us know and we’ll tailor the blend accordingly.

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Q. Do you offer blended soils for bioretention and stormwater projects?

Yes. We supply engineered Bioretention Soil Media (BSM) designed for bioswales, rain gardens, and low-impact development (LID) systems. These mixes are formulated to meet performance requirements for infiltration, pollutant removal, and long-term stability.

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Q. How are blended soils delivered?

All blended soil mixes are delivered in bulk by dump truck directly to your home or jobsite. Our residential-friendly trucks are suitable for driveways and tight access areas. The material is dumped in one location unless otherwise arranged.

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Q. How much blended soil should I order?

Quantity depends on the size and depth of your project. As a general rule, one cubic yard covers about 100–150 square feet at 2–3 inches deep. For raised beds and planters, volume calculations are based on length × width × depth. We’re happy to help you calculate the right amount before ordering but most custom blends require a 10 cubic yard minimum order.

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Q. Will the blended soil look exactly the same every time?

Because blended soils use natural organic materials, slight variations in color, texture, and moisture are normal. These variations do not affect performance and are typical of professionally blended, compost-based soil products.

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