UPuper® is a professional enterprise that produces rock wool substrates for soilless cultivation, with complete testing equipment and strong technical strength. Our products mainly include Growing Cubes,Seedling plug,Rockwool cubes,propagation block,Grow Plug,grow slab and are widely used in agriculture, landscaping, and other industries. Our product has passed SGS, CE, and Australian heavy metal standard tests.

Nowadays, our products are registered in more than 20 countries and have a global sales footprint. Our products have gained widespread recognition and trust from users and can meet the constantly changing economic and social needs. UPuper ® We will be committed to providing pollution-free, high-performance, sustainable, and safe substrates for agricultural facilities, and leading the future of modern smart agriculture with excellent quality, first-class services, and efficient and accurate planting methods.

 Please note: This table is for reference only, please consult us for specific information.



seedlings rockwool plugs can be made into different specifications according to the needs, which is suitable for automatic sowing, industrialized seedling raising, mechanized transplanting etc. UPuper® rock wool is light without scattering, which can reduce labor cost and intensity. It helps to improve labor environment and production efficiency.
The return liquid of UPuper® rock wool is clean so that it can be recycled, which not only saves water and fertilizer, but also protects the environment. UPuper® rock wool substrate is manufactured in full automatic production lines so that the customer will receive products with accurate size and fast delivery time. UPuper® can meet the needs of different growers in different periods.

Instructions for using rockwool cubes:
1. Soak the rockwool cubes in warm water to fully foam.
2. Put the rockwool cubes into a container and distribute evenly.
3. Place the seeds gently on the surface in the correct direction and wrap them in rockwool cubes, as the frosted rockwool  grow cubes can absorb enough water to ensure sufficient moisture coverage of the plant roots.
4. Depending on the variety of plants, they can grow new roots under the support of external plant sprouting cloths, achieving germination.
5. Put the sprouted cloth blocks of plants back into the container and replenish them with water in a timely manner.


Individually wrapped cubes hold the rockwool’s shape and prevent algae growth.
Easy to transport without hurting the roots and can improve transplanting efficiency.

seedlings rockwool plugs---FAQs Guide

1.What are the key considerations for matching the size of seedlings rockwool plugs to the specific plant species being cultivated?
2.What is the recommended method for disposing of used seedlings rockwool plugs to minimize environmental impact?
3.How are seedlings rockwool plugs sterilized and prepared for safe use in plant cultivation?
4.What types of fertilizers and nutrients are commonly used with seedlings rockwool plugs?
5.How do seedlings rockwool plugs help prevent overwatering or waterlogged conditions in plant root systems?
6.As a seedlings rockwool plugs manufacturer,What's the term of payment?
7.Can seedlings rockwool plugs be reused, and what is the recommended cleaning and sterilization process for multiple growing cycles?
8.As a seedlings rockwool plugs manufacturer,What is soilless cultivation?
9.About seedlings rockwool plugs,Should I water from the top or root of the plant?
10.Are seedlings rockwool plugs pH-neutral, and do they require any adjustments before use?
11.About seedlings rockwool plugs,What is the minimum purchase?
12.Are seedlings rockwool plugs compatible with automatic irrigation and nutrient delivery systems commonly used in hydroponics?

1.What are the key considerations for matching the size of seedlings rockwool plugs to the specific plant species being cultivated?

As a seedlings rockwool plugs manufacturer, UPUPER will tell you the following factors:
1. Plant size: The size of the rockwool cubes should be matched to the size of the plant. For example, larger plants will require larger cubes, while smaller plants will require smaller cubes.
2. Plant root system: The size of the rockwool cubes should also be matched to the size and complexity of the plant’s root system. For example, plants with larger and more complex root systems will require larger cubes.
3. Plant growth rate: The size of the rockwool cubes should also be matched to the plant’s growth rate. For example, plants with faster growth rates will require larger cubes.
4. Plant nutrient requirements: The size of the rockwool cubes should also be matched to the plant’s nutrient requirements. For example, plants with higher nutrient requirements will require larger cubes.
5. Plant water requirements: The size of the rockwool cubes should also be matched to the plant’s water requirements. For example, plants with higher water requirements will require larger cubes.

2.What is the recommended method for disposing of used seedlings rockwool plugs to minimize environmental impact?

The recommended method for disposing of used seedlings rockwool plugss is to compost them. Rockwool is made from basalt and chalk, which are both natural materials that can be broken down by microorganisms in the soil. Composting the cubes will help to reduce the environmental impact by returning the materials to the soil.

3.How are seedlings rockwool plugs sterilized and prepared for safe use in plant cultivation?

seedlings rockwool plugs are typically sterilized using a combination of heat and steam. The cubes are placed in a steam chamber and heated to a temperature of around 180°F (82°C) for a period of time. This process kills any bacteria, fungi, and other microorganisms that may be present in the cubes. After sterilization, the cubes are then soaked in a nutrient solution to prepare them for use in plant cultivation.

4.What types of fertilizers and nutrients are commonly used with seedlings rockwool plugs?

Common fertilizers and nutrients used with rockwool grow cubes include:
-Organic fertilizers such as fish emulsion, kelp meal, and compost tea
-Synthetic fertilizers such as 20-20-20, 15-30-15, and 10-52-10
-Micronutrients such as iron, zinc, and manganese
-Calcium and magnesium supplements
-pH adjusters such as lime or sulfur

5.How do seedlings rockwool plugs help prevent overwatering or waterlogged conditions in plant root systems?

seedlings rockwool plugs are made of a porous material that helps to regulate the amount of water that is available to the plant roots. The material is designed to absorb and retain water, while also allowing excess water to drain away. This helps to prevent overwatering and waterlogged conditions in the root system, as the plant is able to take up only the amount of water it needs.

6.As a seedlings rockwool plugs manufacturer,What's the term of payment?

T/T, Paypal, Credit card etc.

7.Can seedlings rockwool plugs be reused, and what is the recommended cleaning and sterilization process for multiple growing cycles?

Yes, seedlings rockwool plugs can be reused. The recommended cleaning and sterilization process for multiple growing cycles is to soak the cubes in a 10% bleach solution for 10 minutes, rinse them thoroughly with clean water, and then allow them to dry completely before reusing.

8.As a seedlings rockwool plugs manufacturer,What is soilless cultivation?

Soilless cultivation is a method of cultivating plants without natural soil nor use compound fertilizer and similar compound fertilizer based on soil. It is a new method that only uses nutrient solution to support for plant growth or various cultivation substrates that can replace soil and are suitable for plant growth. Soilless cultivation can be divided into fog cultivation, water cultivation and solid substrate cultivation. UPuper® Rock wool substrate belongs to solid substrate cultivation.

9.About seedlings rockwool plugs,Should I water from the top or root of the plant?

Seedling raise can use the tidal seedbed and the drip irrigation control system used after transplanting. Those processes are watered from below the plant and close to the root.

10.Are seedlings rockwool plugs pH-neutral, and do they require any adjustments before use?

seedlings rockwool plugs are generally pH-neutral and do not require any adjustments before use. However, it is recommended to check the pH of the cubes before use to ensure they are at the desired level.

11.About seedlings rockwool plugs,What is the minimum purchase?

The MOQ is one carton.

12.Are seedlings rockwool plugs compatible with automatic irrigation and nutrient delivery systems commonly used in hydroponics?

Yes, seedlings rockwool plugs are compatible with automatic irrigation and nutrient delivery systems commonly used in hydroponics. However, it is important to note that rockwool cubes should be soaked in water before use to ensure that they are properly hydrated. Additionally, rockwool cubes should be flushed with water every few weeks to prevent nutrient buildup.

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