How To Germinate Seeds For Hydroponics

by RightFit Gardens | Last Updated: June 21, 2021

A hydroponic system is a perfect method for germinating seeds, and growing plants from seeds hydroponically can also be a great option. Compared to soil-based growing, a hydroponic garden is more hygienic and efficient. Furthermore, it guards plants from root rot and insect damage. With this growing method, everything is automated so that you can control the entire system. If you cannot get your seeds to germinate and propagate, knowing how many to plant will be useless. For that reason, you must carefully plan the environmental conditions for each stage of the plant’s life.

How Seeds Germinate Under Hydroponic Conditions

During germination, plants break out of their seed shells and become seedlings under the right conditions. Whenever you notice plant parts protruding from the seeds, you must take them out of the seed starter system.

Hydroponic Seed Germinating Requirements

You’ll need the following:

A hydroponic germination sponge is used to germinate seeds. Because it minimizes root damage during transplanting and separating seedlings, it is an ideal seed germination medium. The sponges are all cut so that seeds can germinate quickly.

If you want your seeds to grow well, you should invest in the following:

Do’s and Don’ts of Hydroponic Seed Germination

Hydroponic Seed Germination Mediums

hydroponic seed germinationCoco Peat

Growing medium made from coconut peat is a byproduct of coco production. Coir fibers are processed into coco peat products by washing and heating them. The most common form is large bricks.

As a nutrient storage and release agent for plants, coco peat also enhances the oxygenation process. Natural coco peat has pH levels between 5.0 and 6.8, making it slightly acidic and bordering neutral. Coco Peat has one downside: loose particles can get washed around the system. If this happens, then these can block pumps, and reservoirs can become sludge-filled.


Rockwool isn’t natural; it’s made from silica-based materials heated and spun into thin threads. Insulation for roofs is made in much the same way and should be handled with the same care.

When used, a Rockwool starter plug delivers an ideal material that has almost a perfect oxygen to water ratio, as well as pH neutrality. It usually comes as cubes or seedling plugs around 1-inch square and is ideal for starting seeds. Grow cubes made of Rockwool have a pH level between 7.8 and 7.9, which is slightly alkaline.

Coco Coir

Coco coir growing medium is made from the same process as coco peat, except it’s not powdered. In other words, it is coconut hair. A passive hydroponic system is mainly used as starter cubes or more giant cubes to be used later. Although it has the same properties as coco peat and is an excellent growing medium in general, it can have the same drawbacks. Moreover, sediment can wash off and clog the pumps, resulting in sludge buildup in the reservoir. Before using, coconut coir can be rinsed to remove any loose particles.

Hydroponic Seed Germination Phases 

As seeds germinate, they begin in a dormant state and then grow to an active state. This phase consists of five parts:

As the dormant state ends, the Radicle will crack, leading to an early shoot. For this to occur, the seeds must be in warm, moist conditions. Cotyledons are responsible for providing seeds with their first nutrients, which they would traditionally get from the soil, but they have no chance to do so in hydroponic systems. When a couple of seeds are propagated, they become stronger and gain their first leaves and more robust roots and stronger plant roots. Plant roots emerge inside the germination plug when the seeds emerge, and they eventually emerge as the plants emerge from the seed. The time to transplant plants into the system is when they have developed two or three sets of leaves.

Select a hydroponic system based on your budget and plants’ needs. Depending on your needs, you can choose either a passive or active hydroponic system. In an active hydroponic system, the germination of seeds is done via an artificial method, while in passive hydroponic systems, the process is naturally carried out. Plants can be successfully grown in deep water without using a growing media, also known as deep water culture.

Seed Preparation

How To Germinate Seeds


When starting seeds for your indoor garden, it is often a stressful experience because you need to maintain the correct amount of moisture for a high success rate. Germination is often performed in Rockwool cubes due to their excellent moisture retention. In the seed germination process, moisture plays a critical role. Seeds can be watered by openings in their coats or micropyles, known as seed openings. Germination begins when the water activates enzymatic reactions within seeds.