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Water-Retention - vermiculite retains moisture a lot better than soil. Besides retaining water well, it also holds onto nutrients well and generally keeps its shape quite well. This helps to aerates the soil, as oxygen can freely pass between the particles. The combination of these 3 factors makes it a very welcoming place for growing moisture-loving plants, including fruits and vegetables.

Propagation - mixed in with soil, or be used on its own. It's a perfect growing medium when you're propagating your plants. It's a little like propagating your plants in water, but adding oxygen flow to the water. When you're propagating with only water, very little oxygen will reach the roots. Since the Vermiculite are solid particles, oxygen can easily pass between the individual pieces to reach the roots of your plant.

Lightens soil - when you mix vermiculite with your soil, you're adding very lightweight pockets of air to your soil. When your soil is light while retaining moisture well, your plant can easily grow roots. Generally, when you have soil that's moist, it's quite heavy. This heavy soil makes it more difficult for your plant to grow roots more quickly. The light soil promotes growth and allows the roots to spread throughout the pot more quickly. Heavier soil also blocks more oxygen from reaching the roots, while the Vermiculite helps to improve the oxygen flow.

Fertilising - vermiculite, unlike most other hydroponic growing-mediums, is great at absorbing nutrients. Vermiculite helps your plants to absorb nutrients more quickly, which is great for promoting a lot of quick growth.

Long-term - vermiculite is a sterile growing medium without any living organisms. The biggest benefit of this is that Vermiculite can't go bad. It's naturally resistant to fungi, mold, and other diseases. This makes it a perfect part of the soil for your moisture-loving plants. This type of moisture is usually a perfect place for fungi to grow. Vermiculite helps to prevent this.