Grodan Block
Best starter cubes for hydroponic seed propagation and seamless transplanting.
These rockwool cubes are the gold standard for starting seeds, offering a foolproof structure that forces roots downward for effortless transplanting. You trade the organic feel of soil for a sterile, high-performance medium that guarantees consistent oxygenation and rapid, predictable growth.
$18.08
at
Hydroponics Supply USA
Who it's for
- Hydroponic enthusiasts requiring precise moisture and aeration control
- Commercial growers seeking consistent, pathogen-free root development
- Indoor gardeners aiming to reduce plant transplant shock
Who should skip it
- Gardeners preferring a simple, ready-to-use planting medium
- Users sensitive to skin or respiratory irritants
- Eco-conscious growers prioritizing biodegradable or sustainable materials
Performance breakdown
Root development
Engineered fibers actively encourage downward root growth for healthier starts.
Oxygen retention
High-porosity structure ensures roots receive consistent oxygen for rapid development.
Transplant efficiency
Uniform block design makes moving seedlings into larger systems seamless.
Moisture management
Superior absorption capacity keeps hydration levels stable during critical growth stages.
Drainage performance
Integrated grooves effectively prevent waterlogging in hydroponic setups.
System compatibility
Standardized sizing integrates perfectly with common propagation and hydroponic trays.
Key Specs
Cube Dimensions
2 in X 2 in X 1.5 in
Quantity per Sheet
24 cubes
Material
Rockwool (Stonewool)
Packaging
Plastic wrapped
Soil Type
Potting Mix
Moisture Retention Level
High
Drainage Level
Moderate Draining
Intended Use
Seed Starting, Vegetables
Pre-fertilized
False
Organic Certified
False
Know before you buy
Still have a question?
Ask Metto anything about the Grodan Block before you decide.
