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Vivosun 1.6" rockwool grow cubes in a rectangular slab, pre-scored for easy separation.
Close-up of Vivosun rockwool cubes with pre-formed holes for seeds, ideal for transplanting plants.
Hydroponic lettuce, strawberries, flowers, and herbs showcased in a variety of uses, from hobbyists to commercial growers.
VIVOSUN rockwool cubes: High-quality basalt, good permeability, better breathability for plant roots.
Vivosun rockwool grow cubes being split with scissors. 1 inch cubes shown, glove warning present.
Close-up of Vivosun rockwool grow cubes with pre-formed holes for seeds.
Vivosun rockwool grow cubes in a grid pattern on a black background.
Stack of 4 yellow Vivosun rockwool grow cubes, each with a grid pattern of indentations, on a black background.
Stack of four light yellow Vivosun Rockwool grow cubes, each with grid pattern, on black background.
Product specifications for Vivosun rockwool grow cubes, with dimensions 11.8" x 6.5" x 1.6".
Vivosun rockwool grow cubes: 200 pack, 11"x5.3"x1", basalt material.
Vivosun 1.6
Close-up of Vivosun rockwool cubes with pre-formed holes for seeds, ideal for transplanting plants.
Hydroponic lettuce, strawberries, flowers, and herbs showcased in a variety of uses, from hobbyists to commercial growers.
VIVOSUN rockwool cubes: High-quality basalt, good permeability, better breathability for plant roots.
Vivosun rockwool grow cubes being split with scissors. 1 inch cubes shown, glove warning present.
Close-up of Vivosun rockwool grow cubes with pre-formed holes for seeds.
Vivosun rockwool grow cubes in a grid pattern on a black background.
Stack of 4 yellow Vivosun rockwool grow cubes, each with a grid pattern of indentations, on a black background.
Stack of four light yellow Vivosun Rockwool grow cubes, each with grid pattern, on black background.
Product specifications for Vivosun rockwool grow cubes, with dimensions 11.8
Vivosun rockwool grow cubes: 200 pack, 11
Ask Sage about this product

Vivosun Rockwool Grow Cubes Starter Sheets

Official VIVOSUN Dealer Model: WEB-RC-0001
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  • Includes 200 individual plugs in the 1 inch format or 28 per sheet in the 1.6 inch format.
  • 95 percent porosity allows for consistent airflow around the root zone during germination.
  • Inert basalt fiber construction ensures a sterile foundation for all types of plant material.
  • View More Details

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THROUGH THE Cultivator's LENS Hands-On Evaluation

  • You are starting seeds in a controlled environment because your previous soil attempts resulted in uneven moisture levels.
  • You are switching to sterile media because your past setups suffered from damping off and inconsistent germination.

  • The pre-formed holes save a lot of time when you are running several full sheets for a propagation cycle.
  • These cubes hold their shape well, so they do not fall apart in your hands during the final transplant phase.

  • Growers who made the switch report that their roots fill these cubes faster than they ever did in loose soil.
  • Users who keep these in a humidity dome say they no longer deal with the erratic dry spots they saw in other media.

Vivosun Rockwool Grow Cubes Starter Sheets

Starting seeds and clones in soil invites damping off, uneven moisture, and roots that struggle for oxygen, all of which lead to slow, inconsistent starts. Vivosun Rockwool Grow Cubes give every seed and cutting a sterile, uniform start. With 95% porosity, roots stay in constant contact with air, while the fibrous structure holds water and nutrients longer than soil. The result is faster germination and stronger root systems that are ready to transplant sooner.

Each cube is made from basalt rock that's melted at high temperature, spun into fibers, and compressed into a dense block that holds its shape without crumbling. A pre-formed planting hole in every cube makes seeding and cloning quick. Once roots develop, the cubes break apart easily for transplanting into net pots, soil, or larger rockwool blocks.

Choose the 1" cubes (4 sheets of 50, 200 plugs total) for high-volume seed starting, or the 1.6" cubes (28 per sheet, available in 1-sheet or 4-sheet packs) for larger seeds and cuttings that need more root room. Both sizes suit hobby growers and commercial propagation.

Features

Vivosun rockwool grow cubes starter sheet with pre-formed planting holes
Vivosun rockwool cubes supporting seedling root development
Vivosun basalt rockwool cube porous fiber structure
Vivosun rockwool starter plugs for seed starting and cloning
🪨
Basalt Stonewool

Melted basalt fibers are compressed into dense cubes that hold their shape without crumbling.

🌬️
95% Porosity

Keeps roots in full contact with oxygen for rapid, vigorous early growth.

🧫
Sterile & Inert

Inorganic, sterile media provides a cleaner start for seeds than soil.

💧
Long Water Retention

Fibrous structure holds water and nutrients longer to build stronger root systems.

🕳️
Pre-Formed Planting Holes

Every cube is ready for a seed or cutting, making propagation fast and consistent.

✂️
Easy to Separate

Break or cut cubes apart to transplant into net pots, soil, or larger blocks.

What's Included

  • 1x or 4x Rockwool Grow Cube Starter Sheets, based on the option selected

Specifications

Specification Value
Material Basalt stonewool
Porosity 95%
Planting Hole Pre-formed in each cube
Uses Seed starting, cloning, cuttings, hydroponics
1.6" Cube Sheet Dimensions 11.8" × 6.5" × 1.6"
1.6" Cubes per Sheet 28
1.6" Sheet Weight 150 g (5.3 oz)
1.6" 1-Pack 1 sheet, 28 cubes
1.6" 4-Pack 4 sheets, 112 cubes
1" Cube Sheet Dimensions 11.0" × 5.3" × 1.0"
1" Cubes per Sheet 50
1" Sheet Weight 3.5 oz
1" 4-Pack 4 sheets, 200 cubes

How to Use

  1. Soak the rockwool in a nutrient solution adjusted to your target pH.
  2. Place seeds or cuttings into the pre-formed planting holes.
  3. Maintain proper moisture, light, and temperature to support germination.
  4. Once roots extend about 0.5–1" through the cube, separate it and transplant into a suitable container.

Warranty

Vivosun Rockwool Grow Cubes are a consumable growing medium sold as-is with no warranty.

Frequently Asked Questions

Do I need to soak rockwool cubes before planting? +

Yes. Soak the cubes in a nutrient solution adjusted to your target pH before adding seeds or cuttings. This conditions the rockwool so it provides a stable, nutrient-ready environment from day one.

Should I choose 1" or 1.6" cubes? +

The 1" cubes pack 50 plugs per sheet, which makes them the efficient choice for high-volume seed starting. The 1.6" cubes give larger seeds and cuttings more room to root before transplanting.

Can I use these cubes for clones and cuttings? +

Yes. Vivosun Rockwool Grow Cubes work for cloning, cuttings, seed starting, and general plant propagation. The high porosity and water retention support fast root development on fresh cuttings.

When should I transplant my seedlings? +

Transplant once healthy roots have grown about 0.5–1" through the cube. Separate the cube from the sheet and move it into a net pot, soil, or larger container.

Why use rockwool instead of soil for starting seeds? +

Rockwool is sterile and inorganic, which gives seeds a cleaner start than soil. Its 95% porosity keeps roots oxygenated, while the fibrous structure holds water and nutrients evenly for more consistent germination.

Will the cubes fall apart when wet? +

No. The basalt fibers are compressed using a proprietary process so each cube holds its shape without crumbling, even when fully saturated. You can still cut or separate cubes cleanly when you need to.

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