Permatill is a brand name for a type of expanded slate soil amendment. Expanded slate is a lightweight and porous material made from natural slate that undergoes a process of expansion at high temperatures. Permatill is often used in gardening and landscaping to improve soil structure, aeration, and drainage. Here are some key features and benefits of Permatill:

1. Lightweight: Permatill is lightweight, making it an excellent choice for improving soil structure without adding excessive weight to the soil. This is particularly beneficial for container gardening and raised beds.

2. Aeration: The porous nature of expanded slate promotes good aeration in the soil. It helps prevent soil compaction, allowing the roots of plants to access oxygen more easily.

3. Drainage: Permatill improves drainage in the soil, which is crucial for preventing waterlogged conditions. Excess water can drain through the porous structure of the expanded slate, reducing the risk of root rot and other water-related issues.

4. Mineral Content: Slate is a natural mineral, and Permatill can contribute some essential minerals to the soil. While it's not a fertilizer, the presence of minerals can have some positive effects on plant growth.

5. pH Neutral: Permatill is generally pH neutral, which means it won't significantly alter the pH of the soil. This makes it versatile and suitable for use in various types of soils.

6. Longevity: Permatill is durable and does not break down quickly. This can provide long-lasting benefits to the soil structure and drainage.

7. Versatility: It can be used in a variety of applications, including mixing with potting soil, incorporating into garden beds, or adding to the soil in container plants.

When using Permatill, it's important to follow recommended application rates and guidelines. Overuse of any soil amendment can have unintended consequences, so it's wise to consider the specific needs of the plants you are growing and the existing characteristics of your soil.