Hydroponic Growing Sponge for Seeding NurserySeed Starting, Germination & Rooting
| Description | Hydroponic Growing Sponge |
| Raw materials | Polyurethane Foam |
| Size | 25*25*25，25*25*40，30*30*40mm, or customized |
| Application | NFT system,DWC system,dutch bucket system,seedling trays |
| MOQ: | > 100000cubes (100000cubes/carton) |
Product Description
Product Features：
Hydroponic Growing Sponge for Seeding NurserySeed Starting, Germination & Rooting is specially designed for fast and efficient seed germination in hydroponic systems. Made from soft and highly absorbent material, this hydroponic growing sponge provides the ideal balance of moisture and aeration, ensuring that seeds sprout quickly and roots develop evenly.
Each cube of this hydroponic growing sponge has a uniform 25×25×25mm size, making it compatible with most seedling trays, nursery baskets, and hydroponic devices such as NFT, DWC, aeroponics, and vertical towers. The pre-cut seed hole design helps hold the seed in place, allowing roots to penetrate the hydroponic growing sponge smoothly while maintaining excellent oxygen circulation.
This hydroponic growing sponge is clean, soil-free, and highly resistant to pests and diseases, making it perfect for both home growers and commercial nurseries. It provides consistent moisture retention, reduces root damage during transplanting, and helps young plants establish strong root systems faster.
Whether you are growing leafy greens, herbs, microgreens, flowers, or vegetable seedlings, this hydroponic growing sponge delivers stable performance and high germination success. It is an essential growing medium for modern hydroponic farming, offering a clean, convenient, and reliable solution for seed starting and nursery propagation.
🌾 Key Features
Standard 25×25×25mm size for universal nursery and hydroponic systems
High water retention keeps seeds moist for faster germination
Excellent aeration promotes strong and healthy root development
Pre-cut seed hole design improves seed placement and stability
Clean and soil-free—reduces pests, diseases, and contamination
Suitable for all seeds: lettuce, herbs, vegetables, flowers, microgreens
Compatible with NFT, DWC, Dutch bucket, tower systems, and nursery trays
🌼 Applications
Seed germination
Hydroponic seed starting
Nursery propagation
Vegetable seedlings
Commercial greenhouse and home gardening
Microgreen production
Cloning and rooting
Data Sheet:
| Description | Hydroponic Growing Sponge |
| Raw materials | Polyurethane Foam |
| Size | 25*25*25，25*25*40，30*30*40mm, or customized |
| Application | NFT system,DWC system,dutch bucket system,seedling trays |
| MOQ: | > 100000cubes (100000cubes/carton) |
Details:
FAQ – Hydroponic & Agriculture Solutions：
1. Who are we?
We are located in Guangdong, China, established in 2017, serving both domestic and international markets:
Domestic market: 30%
North America: 20%
South America: 20%
Southeast Asia: 10%
Middle East: 10%
Eastern Europe: 3%
Western Europe: 3%
Northern Europe: 3%
Southern Europe: 0%
2. Are you a factory or trading company?
We are the source manufacturer with our own factory and can provide complete hydroponic and agriculture solutions.
3. How can we guarantee the quality?
Always provide a pre-production sample before mass production.
Always carry out final inspection before shipment.
4. What can you buy from us?
Hydroponic Systems:
Vertical Tower System
NFT Hydroponic System
Substrate Gutter System
Microgreen Rack System
EBB&Flow Table System
Dutch Buckets Hydroponic
Agriculture Equipment & Irrigation Systems
Hydroponic Solutions:
Greenhouse Project
Indoor Vertical Farming Project
5. What services can we provide?
Delivery Terms: FOB, CFR, CIF, EXW, FAS, CIP, FCA, DEQ, DDP, DDU, Express Delivery, DAF
Payment Currencies: USD, EUR, CAD, RMB
Payment Methods: Wire Transfer, Letter of Credit, Credit Card, Western Union, Cash, Escrow
Languages Supported: English, Chinese, French, Russian
6. What is hydroponic rock wool made of?
Rock wool is made from natural basalt rock melted at high temperatures and spun into fine fibers. It’s an inert and sterile material perfect for hydroponic growing.
7.Why is rock wool good for hydroponic seedlings?
Because it has high porosity and excellent water-holding capacity, allowing both air and moisture to reach the roots easily — which promotes faster germination and stronger root systems.
8. Do I need to soak rock wool before using it?
Yes. Before planting, soak the cubes in pH-adjusted water (around 5.5–6.0) for about 10–15 minutes to stabilize pH and ensure even moisture.
9. Can rock wool be reused?
Yes, it can be reused after thorough cleaning and sterilization (using boiling water or hydrogen peroxide solution). However, for sensitive crops, new cubes are recommended.
10.Is rock wool safe and eco-friendly?
Absolutely. It’s made from natural basalt rock and contains no harmful chemicals. It’s inert, non-toxic, and safe for both people and plants.
11.What sizes of rock wool cubes are available?
We offer 25×25×25 mm, 30×30×40 mm, and 40×40×40 mm cubes — suitable for different growth stages from seed germination to transplanting.
12.Which plants can grow in rock wool?
Almost any hydroponic crop — including lettuce, herbs, tomatoes, peppers, cucumbers, strawberries, and microgreens — can thrive in rock wool cubes.
13.How should I store unused rock wool cubes?
Keep them in a dry, cool, and clean area, away from direct sunlight and moisture to maintain sterility.
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