Begrow Stone Wool Starter Plugs - 35 x 40mm - 2500 Count

Uniform Stone Wool Plugs for Even Seedling Starts - 2500 Plugs

Uneven moisture in starting media leads to uneven sprouts. These plugs use a chaotic fiber structure with consistent density, which helps hold water and nutrient solution evenly and keeps pH steady. The result is seedlings that grow to a similar size. They wet fully in under 25 seconds when immersed.

This 2500 count unit suits nurseries, commercial hydroponic operations and serious indoor growers who start many plants at once. Hobbyists starting a few trays will have plenty of stock to share or store.

Key Features & Benefits

• Uniform density — supports even water and nutrient distribution across the whole tray.
• Chaotic fiber structure — helps hold moisture while keeping the medium open.
• Fast wetting — full immersion in under 25 seconds.
• High porosity — over 95%, leaving room for air and roots.
• 35 x 40mm size — fits into stone wool cubes with holes for transplanting.

Who Should Use Begrow Stone Wool Starter Plugs

Growers running hydroponic systems who want a consistent first stage for seeds or young plants. The count suits high-volume starts.

About Begrow Stone Wool Starter Plugs

Begrow stone wool plugs measure 35 x 40mm and come as one unit of 2500 plugs. Average fiber diameter is 6 µm, density is 90 kg/m³ +/- 10%, and organic matter is 1 - 4%. Recommended relative humidity is 40 - 85%. Shipping weight is 19 lb and the carton measures 24 x 23 x 18 in.

Frequently Asked Questions

Q: What are stone wool starter plugs used for?
A: They are the first stage of hydroponic cultivation. Seeds germinate in the plug, and the plug is then placed with the sprout into a larger stone wool cube.

Q: What does porosity mean?
A: Porosity is the share of the material's volume that is open space. These plugs are above 95% porous, so they hold both water and air.

Q: How does the density affect results?
A: Consistent density helps the plug hold water and nutrient solution evenly. That supports stable pH and sprouts of similar size.

Q: How fast do the plugs wet?
A: Full immersion takes under 25 seconds. Pre-soak them in your prepared solution before sowing.

Q: What humidity range is recommended?
A: Relative humidity of 40 - 85% is recommended.

Q: How many plugs come in one unit?
A: One unit holds 2500 plugs.