Cannabis Growing Guide: Soil

For those growing indoors or in pots, choosing the best soil can be tricky. Especially for new growers, who face a lot of false advertising. It is crucial to ensure the soil contains plenty of nutrients to support plants until harvest. There are many choices, so today we explore the most popular, discussing their pros, cons, and which type of grower they suit best.

Firstly, let's consider what soil growing offers. While some prefer hydroponics, others find soil indispensable.

• Clay Soil: Considered the best organic option for cannabis, clay is rich in minerals and nutrients. However, it doesn't drain well, and the effort can be intense.
• Silt Soil: Holds moisture and drains well, making it perfect for seedlings. It is soft, malleable, and fertile, excellent for a larger yield.
• Sandy Soil: Drains well and is easy to aerate, making it great for indoor growing. However, it dries quickly and struggles to retain moisture.
• Loam Soil: A mix of clay, silt, and sand, it is easy to work with and fertile. The downside is its price.

Choosing the right soil depends on factors like grow space and strain type. There are no guarantees, so experimenting is key. Ideally, soil should be slightly acidic, with a pH of 5.8 – 6.3. Testing soil before use is advisable.

The soil should naturally contain a good array of nutrients. Avoid direct fertilisation; instead, use broken-down organic matter. A nutrient-rich potting soil mix can ensure plants get what they need. Different growth stages require different nutrient levels.

The most important soil aspects are drainage, water retention, and texture. Quality soil is essential for healthy plant growth.

Improving soil quality can involve adding perlite for better drainage and oxygenation. Perlite, a mix of airy rocks, helps break up soil texture. For enhanced water retention, vermiculite can be added. This works well with perlite to prevent over-draining and helps soil absorb more water.

If water retention needs improvement without increasing soil density, coco coir is ideal. Made from coconut husks, it aids quick root development, ensuring plants are well-fed. These tips aim to assist inexperienced growers in selecting quality potting soil for their plants.

Many online stores sell soil specifically for cannabis growing. However, if a garden centre is the only option, knowing what to look for ensures the best soil choice.