Grow Cubes 1.5" Hemp Cubes
Best sustainable starter medium for home gardeners and hydroponic enthusiasts.
Nurture your seedlings with Harris Seeds Grow Cubes, crafted from sustainable hemp fiber. These 1.5-inch cubes are perfect for both seed-starting and hydroponic systems. They offer excellent moisture retention and aeration, promoting healthy root growth while remaining pH neutral for optimal nutrient uptake. The biodegradable design allows for direct planting, minimizing transplant shock. Plus, the natural antimicrobial properties of hemp fiber help protect young plants from common diseases, ensuring a strong start.
$12.95
Owner Satisfaction
4.6
/ 5
Category Rank
516
/ 1247
#516 in Soil
Price vs Category Average
-74%
Below average
Size
1.5
/ inches
Who it's for
- Eco-conscious gardeners prioritizing sustainable and biodegradable growing materials
- Indoor growers needing superior root oxygenation for healthy plant development
- Seedling starters wanting a stable, low-maintenance pH growing environment
Who should skip it
- Budget-focused growers comparing costs against traditional rockwool or peat
- Long-term propagators requiring media that maintains structure over extended periods
- Local shoppers needing immediate access to supplies without online ordering
Performance breakdown
Root Development
Hemp fibers provide an ideal structure for rapid, healthy root expansion.
Moisture Retention
Consistent hydration levels keep seedlings thriving without constant manual monitoring.
Transplant Efficiency
Direct planting eliminates root disturbance and minimizes common transplant shock.
Hydroponic Compatibility
The pH-neutral composition integrates seamlessly into most standard hydroponic setups.
Disease Resistance
Natural antimicrobial properties offer a protective buffer for delicate young starts.
Sustainability
Biodegradable hemp fiber offers a superior eco-friendly alternative to synthetic plugs.
Key Specs
Size
1.5 inches
Material
Hemp Fiber
SKU
42025HRDNON-1EA
Intended Use
Seed Starting
Indoor/Outdoor Use
Indoor and Outdoor
Finish Type
Smooth
Shape
Square
Diameter
1.5 inches
Features
- Sustainable hemp fiber construction
- Excellent moisture retention
- Promotes healthy root development
- Reduces transplant shock
- pH neutral for optimal nutrient uptake
- Natural antimicrobial properties
- Ideal for seed starting
- Suitable for hydroponics
What customers say
Grow Cubes receive strong praise as a sustainable alternative to traditional growing media. Growers value the hemp material for its superior balance of aeration and moisture retention, which supports high germination and strong early root development. Users appreciate the environmental benefit of using a renewable resource. The cubes integrate easily into propagation trays, minimizing transplant shock due to their structural integrity. While the initial cost may be slightly higher, the consensus is that the enhanced performance and eco-friendly nature deliver excellent value. The product is celebrated for providing reliable results for sustainable cultivation.
Know before you buy
Yes, these cubes are versatile enough for both methods. They provide excellent aeration and moisture retention for hydroponic systems and integrate seamlessly into soil when you are ready to transplant.
No, you should plant the entire cube directly into your garden or larger container. Because the material is biodegradable, it minimizes transplant shock and allows roots to grow through the fiber naturally.
Hemp fiber possesses natural antimicrobial properties that help create a cleaner environment for young roots. This can reduce the risk of common seedling diseases during the vulnerable early stages of growth.
These cubes are pH neutral, meaning they will not alter the acidity or alkalinity of your water or nutrient solution. This ensures your plants have consistent access to the nutrients they need for healthy development.
While they are ideal for indoor seed starting, they can be used outdoors as well. Keep in mind that they are not frost or UV resistant, so they should be used in a protected environment or transitioned to the ground once the weather is appropriate.
Still have a question?
Ask Hayley anything about this product before you decide.