Sun Gro Sunshine #4 Aggregate Soil
Best high-drainage soil for professional growers and home gardeners.
The Sun Gro Sunshine #4 Soil is a versatile production mix designed for a wide array of crops, offering a higher bulk density compared to Sunshine Mix #1. This blend features Canadian Sphagnum Peat Moss, Resilience, Perlite, Dolomite Lime, and a wetting agent. It is specifically recommended when fast drainage and high air capacity are essential, making it suitable for salt-sensitive crops or situations requiring frequent leaching. This mix is ideal for general use in propagation, bedding plants, vegetable gardening, and various potted crops.
$23.26
Owner Satisfaction
4.5
/ 5
Category Rank
736
/ 1247
#736 in Soil
Price vs Category Average
-54%
Below average
Volume
2.8..
/ cu ft
Who it's for
- Container gardeners prioritizing healthy root systems and drainage
- Commercial growers needing reliable and uniform batch performance
- Busy planters wanting a pre-hydrated, pH-balanced soil base
Who should skip it
- Gardeners unable to commit to frequent daily watering schedules
- Beginners seeking a soil with long-term, built-in fertilization
- Small-scale hobbyists with limited storage space and budget
Performance breakdown
Drainage efficiency
Fast-draining structure prevents root rot in moisture-sensitive plant varieties.
Aeration quality
High air capacity promotes vigorous root development and overall plant health.
Versatility
Adapts seamlessly from seed starting to mature vegetable container gardening.
Structural stability
Higher bulk density provides excellent support for larger, top-heavy potted crops.
Leaching performance
Engineered to handle frequent flushing without compromising the soil structure.
Nutrient retention
Peat-based mix requires consistent supplemental feeding for optimal long-term growth.
Key Specs
Volume
2.8 cu. ft.
Ingredients
Canadian Sphagnum Peat Moss, Resilience, Perlite, Dolomite Lime, Wetting Agent
Comparable to Sunshine Mix #1 but with higher bulk density
Intended Use
Potting, Seed Starting, Vegetable Garden
Soil Type
Potting Mix
Drainage Level
Fast Draining
Primary Amendments
Perlite, Peat Moss
Weed Preventative
No
Features
- Maintains high air capacity for optimal root health
- Versatile formulation for diverse production needs
- Ideal for fast drainage requirements
- Higher bulk density than Sunshine Mix #1
- Suitable for salt-sensitive crops
- Facilitates frequent leaching
What customers say
Consumers consistently praise the exceptional quality and reliability of Sun Gro Sunshine #4. This aggregate soil is highly valued for its superior drainage and light, airy texture, making it an ideal choice for starting seeds and propagating sensitive plants. Users frequently report excellent growth results and appreciate the consistent, professional grade mix straight from the bag. While the price point is higher than standard mixes, customers feel the performance justifies the investment, highlighting its genuine value for serious gardening projects.
Know before you buy
Sunshine #4 has a higher bulk density than Mix #1, which provides more stability for larger plants or containers that might otherwise tip over. It maintains the same high-quality base ingredients but offers a slightly heavier structure.
Yes, it is excellent for propagation and seed starting. The inclusion of perlite ensures the fast drainage and high air capacity necessary for delicate young roots to develop without becoming waterlogged.
The mix is designed for fast drainage, which allows you to leach out excess salts through frequent watering without keeping the root zone saturated. This makes it a safer choice for crops that are easily damaged by salt buildup.
This mix includes dolomite lime to balance the pH, but it does not contain a heavy starter fertilizer charge. You should plan to begin a regular feeding program once your plants have established their first set of true leaves.
While it is formulated as a potting mix, it works very well for container-grown vegetables. We do not recommend mixing it directly into heavy native garden soil, as its texture is specifically engineered for pots and raised beds.
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$23