Grodan A-OK 36/40 6/15 Starter Cubes
Best propagation tool for gardeners starting seeds and cuttings.
Grodan A-OK Starter Cubes provide an optimal environment for seed and cutting propagation. Crafted from unique stonewool fibers, these cubes excel in absorbing nutrient solutions while maintaining excellent oxygen levels for robust root development. The 1.5" x 1.5" V-shaped plugs are designed to prevent root tangling and facilitate easy transplanting into larger blocks or traditional growing mediums. This product ensures a reliable, high-performance start for vigorous early plant growth, supporting successful cultivation for vegetables, flowers, and houseplants.
$17.95
Owner Satisfaction
4.6
/ 5
Category Rank
516
/ 1247
#516 in Soil
Price vs Category Average
-65%
Below average
Material
Grodan Stonewool (Rockwool)
/ Grodan Stonewool (Rockwool)
Who it's for
- Seed starters wanting consistent and disease-free germination
- Gardeners seeking rapid and healthy root establishment
- Hydroponic growers needing stress-free seedling transfers
Who should skip it
- Sensitive individuals avoiding materials that cause skin or respiratory irritation
- Beginners preferring low-maintenance, ready-to-use soil mediums
- Eco-conscious growers prioritizing sustainable and biodegradable materials
Performance breakdown
Root Development
Stonewool structure promotes rapid, healthy root branching for vigorous starts.
Oxygen Retention
Superior aeration prevents waterlogging and supports delicate seedling respiration.
Transplant Efficiency
V-shaped design makes moving plugs into larger blocks seamless.
Moisture Management
Excellent absorption capacity keeps nutrient solutions available exactly where needed.
Propagation Versatility
Reliable performance across a wide range of vegetable and flower varieties.
Structural Integrity
Durable fibers hold their shape firmly during handling and transplanting.
Key Specs
Material
Grodan Stonewool (Rockwool)
Cube Size
1.5" x 1.5"
Quantity
30 sheets of 98 cubes
Weight
23.2 lbs
Format
Fits standard 10x20 flat
Target Plant Type
Vegetables, Flowers, Houseplants
Fertilizer Form
Water Soluble Powder
Release Type
Slow Release
Features
- Optimized fiber structure for plant stages
- High nutrient solution absorption
- Excellent oxygen retention for growth
- Easy transfer to larger mediums
- V-shape plug prevents root tangling
- Ideal for seed and cutting propagation
- Supports vegetables, flowers, and houseplants
What customers say
Grodan Starter Cubes are consistently praised for their reliability and ease of use. Their precut format simplifies seed starting, making them a dependable choice for hydroponic setups. Growers report excellent germination success, establishing these cubes as a solid foundation for successful cultivation. This proven performance ensures hassle free results, making them a preferred option for those seeking consistent outcomes in their growing projects. They offer great value for a reliable start.
Know before you buy
The V-shaped design is specifically engineered to guide roots downward, which prevents them from circling or tangling within the cube. This structure encourages a healthier, more vertical root system that makes transplanting into larger mediums much easier.
Yes, Grodan A-OK cubes are designed to support both propagation methods. The stonewool fiber structure provides the necessary moisture retention for seeds and the aeration required for cuttings to develop roots quickly.
No, these cubes are inert. You will need to provide a nutrient solution tailored to your specific plants to ensure they receive the necessary minerals for early growth.
You should transplant the seedlings once you see healthy white roots emerging from the bottom or sides of the 1.5-inch cube. At this stage, the plant is ready to be moved into a larger stonewool block or a traditional growing medium.
Yes, the sheets are sized to fit perfectly into standard 10x20-inch propagation trays, making them easy to manage in a standard indoor growing setup.
It is recommended to soak the cubes in a pH-adjusted nutrient solution before inserting your seeds or cuttings. This ensures the stonewool is properly hydrated and at the correct pH level for optimal root uptake.
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$18