Peat-Free Soil for Sowing and Growing: Tips for the Right Potting Compost

Why Many Modern Substrates Are Peat-Free Today

Peat used to be a standard ingredient in potting soil. It has a high water storage capacity and helps to keep the substrate moist for a long time – a huge advantage for cultivation. However, peat comes from bogs, which are extremely valuable habitats for rare species and store enormous amounts of carbon. They also regulate the water balance by binding moisture in the soil, thus providing entire regions with a stable supply of water. Peat extraction releases this carbon and massively disrupts the ecosystem, as the soil loses its most important property: its ability to store water.

Alternatives to Peat: New Substrates, New Strategy

Due to the ecological consequences of peat extraction, many countries are rethinking their approach to horticulture, with a shift towards producing alternatives without peat. Today, many potting soils and planting substrates are made from materials such as wood or coconut fibers, composted bark, green compost, and mineral components such as sand or perlite. These new substrates differ from the previous soils—they may look or feel different. Nevertheless, they offer optimal conditions for young plants and have been continuously developed, which is why many professional nurseries and tree nurseries now work successfully with them.

Practical Tips for Working With Peat-Free Soil

Whether you like peat-free soils or not, you have to accept that peat substrates will disappear from the shelves in the long term. However, this is not a big deal, because peat-free alternatives can also be used to grow excellent plants. However, there are a few things to consider when sowing and, above all, when watering. With a few simple adjustments, nothing stands in the way of successful sowing. In line with Steve Quarrie's dynamic approach, the following section explains how to create optimal conditions for your plants and which adjustments you can make.

The right growing medium is essential.

Finding the Right Potting Soil

The right growing medium is essential.

A good potting soil is rich in humus, has a loose, crumbly structure, and a high water retention capacity. It is often heat-treated or sterilized to prevent it from transmitting pathogens, fungal spores, or pests to the sensitive seedlings. It usually consists of a mixture of garden soil, compost, and mineral components such as sand or perlite. You can either buy it ready-mixed from a specialist retailer or simply make it yourself. Instructions on how to make your own potting soil can be found here.

By the way, you can also use a root ball press without pots.

Preparing Pots and Seed Trays Correctly

By the way, you can also use a root ball press without pots.

Do you have the right substrate and your seedling pots ready? Then you're good to go! If you are a beginner and still unsure about what you need to get started, you can find out everything you need to know here Useful information about seed pots and other useful tools for sowing your own seeds.

First, loosely fill your seedling pots with soil. This ensures an airy structure and optimal oxygen supply in the root area. Do not press the substrate too tightly to avoid compaction. This allows the water to drain away much better and the fine roots to grow more easily.

Tips for sowing

Sowing Seeds Correctly

Tips for sowing

Before you start sowing, you should be clear about the specific needs of your plants:

- Are they light or dark germinators?
- How big are the seeds and how deep do they need to be planted in the soil?
- And above all: What is the best way to water the delicate seedlings without damaging them?

The Correct Sowing Depth

As a rough rule of thumb, you can remember: sow seeds about twice as deep as they are large. Tiny seeds are usually light germinators; these seeds are not covered with soil at all or only very thinly, as otherwise the delicate seedlings will not make it to the surface. Large seeds, on the other hand, develop into stronger seedlings. These dark germinators are usually placed a few centimeters deep in the soil.

Water Seeds Correctly

It is best to always use a fine spray nozzle for watering. Otherwise, tiny seeds in particular can easily be washed away. With a fine nozzle, you can carefully control the amount of water. Alternatively, it is possible to water from below. However, for light-dependent germinators that lie directly on the surface, it is advisable to also provide sufficient moisture from above so that they do not dry out.

Plant Knowledge at a Glance

Want to get to know your plants without digging through thick books? In the Fryd Lexicon, you’ll quickly find all the essentials about different plant types and varieties — from sowing, planting, and harvest times to companion planting, location tips, and care advice.

Explore the Lexicon Now

When repotting, you can place most plants deeper into the soil.

Preventing Long Necks: How to Stop Your Seedlings From Bolting

When repotting, you can place most plants deeper into the soil.

The following applies to most vegetable plants: during germination, the seeds prefer slightly warmer temperatures, but after sprouting, lower temperatures are usually sufficient. The most important factor is the right balance of light and heat. If it is too warm and there is not enough light, the plants will usually grow very poorly. In the northern hemisphere, it is generally advisable to wait until the spring equinox, as the days are only then long enough. Alternatively, you can support the cultivation with special plant lamps. In my experience, this combination of too much heat and too little light is often responsible for the plants becoming leggy on the windowsill.

The right watering routine supports root growth.

Watering Seedlings Correctly

The right watering routine supports root growth.

Since water is extremely important for germination, you naturally want to do everything right. As soon as the surface appears dry, you water again—does this sound familiar? This is precisely why many seedlings get too much water, which can lead to rot or fungal infestation. We therefore recommend the finger test: stick your finger into the soil and check whether it is still moist 1–2 cm/0.4 - 0.8 in below the surface. Only water when it is dry there. It is actually beneficial if the surface dries out in between waterings. This encourages the plants to penetrate deeper layers and develop stronger roots. For this reason, watering from below is particularly recommended.

When the first real leaves appear, it's time to prick out and repot.

Tips for Supplying Nutrients to Seedlings

When the first real leaves appear, it's time to prick out and repot.

Growing soil is often less nutrient-rich. The reason for this is that the seeds already contain all the reserves necessary for germination and the formation of the first roots and cotyledons. In fact, young plants become even more susceptible to disease and often grow too quickly and become unstable if the substrate is too nutrient-rich. Only when the first leaves appear after the cotyledons is it time to repot and/or prick out into a more nutrient-rich soil.

When pricking out, your plants are separated.

Transplanting and Repotting Seedlings: Here’s How

When pricking out, your plants are separated.

Once the young plants have developed several leaves, you can transfer them to larger pots with fresh, nutrient-rich soil. First fill the new pot with substrate—this time it can be richer so that the plants are optimally nourished until they are finally planted out. The process is simple: carefully insert the seedling and press the soil down lightly. If you need to separate your seedlings beforehand, you can find instructions on how to prick them out and other tips on how to repot them correctly here Anleitung zum Pikieren sowie weitere Tipps zum richtigen Umtopfen. It is often even beneficial to place the plants a little deeper in the soil. In any case, it is important to water the plants afterwards: this allows the roots to establish contact with the soil and grow well. Without water, the plants would quickly wilt.

If you have any questions or comments, please email us at [email protected]. Would you like to receive helpful gardening tips throughout the year and plan your own garden beds optimally? Then register here or download the Fryd app for Android or iOS.

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Sources

• Steve Quarrie, 2026: From seeds to success - in 6 steps