When it comes to growing cannabis, soil might just be the most important part of the whole setup. As the medium for root development, nutrient absorption, and overall plant health, your soil is the very foundation of your grow. As such, taking the time to properly learn how to manage soil and nutrients is an essential skill for any grower.
By ensuring the proper balance of essential nutrients, maintaining a healthy pH balance, and providing adequate drainage, growers can give their plants everything they need to optimize plant growth, maximize yield, and create the best final product.
Not all soil is created equally. With enough dedication, it’s possible to grow cannabis just about anywhere, but if you want to give your plants the best odds, you’ll need to prepare a proper patch for planting.
Broadly speaking, there are three main types of soil: sand, silt, and clay. Each has its own strengths and weaknesses and play a key role in healthy cannabis soil.
The ideal cannabis soil has a balanced texture with a mixture of sand, silt, and clay: loamy soil. This combination allows for maximum drainage, water retention, and nutrient availability to create the ideal environment for cannabis roots to grow, absorb nutrients, and support healthy plant growth.
Maintaining the proper pH balance in your soil is absolutely vital for ensuring proper nutrient absorption in your plants. The pH level of the soil determines a plant’s ability to absorb any nutrients present adequately. Different nutrients have different solubility at different pH levels, and cannabis plants do their best growing in slightly acidic soil with a pH of 5.8-6.2.
Testing soil pH is quick and easy. If you don’t mind getting your hands dirty, just collect soil samples, mix them with distilled water, and test the solution using a pH testing kit. If you’re a bit more hands-off, then a soil pH meter is an easy alternative.
Adjusting pH levels is as easy as watering your plants. Mix up your nutrients and water like normal and add in any commercially available pH up or down additive. Stir thoroughly and water your plants. Be sure to check the soil pH about an hour after watering to get an idea of the new level.
When adjusting the pH of cannabis soil, it’s important to be gradual and test constantly to avoid drastic swings.
Just like any other organism, cannabis plants require a wide range of primary, secondary, and micro nutrients to reach their full potential.
The primary cannabis nutrients are nitrogen (N), phosphorous (P), and potassium (K). These three form what’s known as an NPK ratio and this appears on almost any cannabis nutrients label. For example, if a nutrient formula is labeled as 3:1:1, it has three parts nitrogen for every one part of phosphorous and potassium.
There is no single best NPK ratio. During the vegetative stage, a high-nitrogen ratio of 3:1:1 is usually ideal. By the time your plants are in full bloom, though, they should be on something more like 1:2:4 to promote flower development.
While nitrogen, phosphorous, and potassium are all that you absolutely need, there are several secondary cannabis nutrients that can benefit any plant. Three of the most important are calcium (Ca), magnesium (Mg), and sulfur (S). Calcium is useful for cell wall structure and leads to a more durable plant, magnesium is required for the creation of chlorophyll, and sulfur plays a role in disease resistance.
Aside from primary and secondary nutrients, cannabis plants can benefit from a wide range of micronutrients including Iron (Fe), Boron (B), and Manganese (Mn). While these all play smaller roles in a plant’s health, they are certainly worth adding. Most lines of nutrients sell a specific micronutrient blend to take all of the guesswork out of measuring.
In general terms, all fertilizers can be said to be either organic or inorganic. This refers to the source of the nutrients in the fertilizer.
These tend to derive their nutrients from natural sources like compost, manure, or plant matter. Organic fertilizers offer several advantages such as improving soil structure, enhancing microbial activity, and increasing organic matter content to promote long-term soil health. Typically, organic fertilizers release nutrients slowly to provide a sustained and gradual nutrient supply. They also help to promote soil fertility and overall quality.
On the downside, organic fertilizers tend to have lower nutrient concentrations meaning that they require more to get the same effect, and nutrient uptake by plants may be slower compared to inorganic fertilizers.
Also known as synthetic or chemical fertilizers, inorganic fertilizers are manufactured through industrial processes. On the whole, this means that they have higher nutrient concentrations and provide nutrients more quickly to plants. This often leads to rapid growth and precise nutrient control.
However, inorganic fertilizers do come with environmental concerns such as nutrient runoff and the potential for water pollution. They have also been shown to disrupt soil microbial activity and reduce long-term soil health.
Proper nutrient management of soil is an essential part of any successful grow. By using well-balanced, loamy soil, monitoring and adjusting soil pH levels, and paying close attention to the NPK ratios of your fertilizers, you can make sure that your plants have the best chances to thrive.
But preparing and monitoring your cannabis soil is just the beginning. If you want to learn all the best tips and tricks for cannabis cultivation, check out some podcasts from our list of the best cannabiz podcasts.
“KayaPush has it all in one platform where you can kind of build what you need. Especially as a start-up, that’s important to us to be cost-friendly. You have the best price for what you’re offering. ”
-Marry Ann from Riverside Wellness-