A Growers Guide To Choosing A Growing Medium

Cannabis cultivation has changed a great deal over the years, particularly when it comes to how many ways there are to grow. This can make choosing a growing medium feel complex, whether you are a hobbyist growing a couple of plants at home or running a larger scale operation.

For anyone getting started, one of the first questions to answer is which of the many grow mediums is best for you. There is no single correct answer, and no magic combination that guarantees perfect results every time.

The right choice depends on what you want out of your yield, how much time and money you can invest, how experienced a grower you are, and what equipment you already have. Let's go over the main options to help you decide which one suits you best.

Growing Medium Comparison at a Glance

Medium	Beginner Friendly	Cost	Yield Potential	Growth Speed	Nutrient Control
Soil	Excellent	Low	Moderate	Slower	Low (forgiving)
Coco coir / soilless mixes	Good	Low-Medium	High	Fast	High
Perlite & vermiculite (as additives)	Good	Low	Improves other mediums	N/A	N/A
Rockwool	Moderate	Medium	High	Fast	High
Hydroponics (DWC, NFT, etc.)	Advanced	High	Highest	Fastest	Very High

Soil

As grow mediums go, soil is the most widely used because it is easy, organic, affordable, and forgiving.

If you are a first-time grower, soil is likely the answer for you because it lets you get away with more mistakes than almost any other medium. Soil is the most forgiving in terms of pH fluctuations, needs comparatively little feeding, and is by far the cheapest approach.

It does come with drawbacks, including a higher risk of pest infestation (which can be troublesome late in the grow), longer growth cycles, and generally smaller yields compared to other growing mediums.

We recommend a Living Organic Soil for the best terpene-rich buds and a simple "just add water" growing experience, or a cannabis-friendly soil mix such as Jiffy PRO7 ALL+ Mix, which already contains enough nutrients to last the first month of your plant's life.

Soilless Grow Mediums

This category technically includes any grow mix that doesn't contain soil, with ingredients such as coco coir, perlite, and vermiculite.

Coco peat is used as a soil additive or as a growing medium on its own. It can be mixed with a wide variety of components to create suitable growing mixes, and is often blended with coconut shell chips and coconut fibre to increase porosity and stimulate root growth.

Most cannabis growers use a mix that's primarily coco coir and perlite. All soilless mixes are technically considered hydroponic since there's no soil, but most growers think of them as somewhere in between soil and hydro — you get a lot of the best parts of both. For a deeper look at feeding and pH specifics, see our complete guide to growing in coco.

These growing mediums offer a middle ground in terms of cost and ease, but give much better yields than soil. They also offer a shorter growing cycle and give you full control over the nutrients your plant has access to, which can be good or bad depending on your experience level.

You will need to manually feed nutrients, and you have smaller margins for error, since you need to carefully monitor and manage pH and nutrients yourself. Even small mistakes will affect the final yield and quality.

When growing in coco, we recommend either a 50/50 coco/perlite mix, or an 80/20 coco/perlite mix if you want to water less often. Some examples we sell are the Jiffy PRO7 COCO 70/30 Coco Perlite Mix, Atami High Porosity Cocos 50L, or you can create your own mix using a Washed Coco Peat Block and Perlite.

Perlite vs Vermiculite

Perlite

Expanded perlite is an excellent aggregate to add to growing mixes, or even to use on its own in hydroponic setups. It is a volcanic mineral that, when heated to roughly 871°C, pops in a similar fashion to popcorn and forms a very light, white material.

Each particle is made of many tiny closed air cells, and tiny cavities on the surface create a large surface area where moisture is held, giving roots access to water. At the same time, the shape of the particles creates air passages between them, providing aeration and helping prevent root rot. Perlite is sterile, so appropriate fertilisers should be added alongside it. Different grades or sizes suit different applications.

Advantages of Horticultural Perlite

• Improves aeration and drainage
• Makes moisture and nutrients readily available to plants
• Is inorganic and does not break down over time
• Has an essentially neutral pH of 6.5 to 7.5
• Insulates against extreme temperature fluctuations
• Is sterile and free of weeds and disease
• Is clean, odourless, lightweight, and safe to handle

Vermiculite

Vermiculite is well established as a growing medium, most commonly used in compost formulations, usually in combination with peat or coir. Vermiculite/peat or coir blends provide ideal conditions for plant growth: the particles aid aeration, improve moisture retention, and promote the steady release of added fertilisers, while vermiculite itself contributes potassium, magnesium, and other minor elements. The air-to-water ratio in these blends is ideal for stimulating root growth and producing healthy young plants. Vermiculite is sterile when processed and, if stored correctly, needs no further treatment before use. It can also be used as a carrier for fertilisers, pesticides, and herbicides, or in ground form for encapsulating seeds.

In conclusion: perlite adds drainage to whatever it's mixed with. Use perlite when:

1. You have plants that need to dry out before watering again
2. You're moving seedlings into separate pots
3. You need to loosen clay soil in your garden

Vermiculite mixes with soil and helps retain water. Use vermiculite when:

1. You need an additive for plants that must be kept moist
2. You want your seed trays to develop strong seedlings

Rockwool

Rockwool is most often used in hydroponic builds, but has several other growing applications too. In terms of both difficulty and cost, this growing medium sits in the mid-to-high range.

Rockwool is more hands-on than soil or perlite, requiring careful management of pH levels and nutrients. It cannot be grown organically, which increases the attention your plant will need.

The most common uses for Rockwool are hydroponics and germination. For germination, its excellent moisture retention and the ease with which seedlings can be transplanted without disturbing the roots make it an ideal choice — see our germination and seedling guides for more detail.

It also significantly lowers the risk of pest infestation, being a non-organic medium. Rockwool is best suited to those with some growing experience, since balancing nutrients correctly matters more here than with soil. Remember that it does not biodegrade, and reusing it is not recommended.

Hydroponics

Hydroponics, in all its variations, is one of the most complex, expensive, and — for those who master it — rewarding approaches to growing.

With the highest possible yields, the tightest nutrient control, the shortest growth cycles, and the lowest pest risk, it's easy to see the appeal. Penn State Extension notes that well-managed hydroponic production can shorten crop cycles and increase yield density compared with soil-based growing, provided nutrient solutions are monitored closely (Penn State Extension). For a full breakdown of the different setups available, read our guide to the different types of hydroponic systems.

Hydroponic setups typically come in one of two varieties: systems that hold another medium like Rockwool or perlite and use drippers to deliver nutrients, and systems that use no solid medium at all, where plant roots hang directly into a nutrient-rich water solution.

Both approaches are highly effective for clean, large yields, but both are more difficult and expensive to get right, making them better suited to experienced growers. This is largely due to the need for close, manual pH and nutrient control, which is generally more sensitive in hydroponic setups than in any other medium. There is something to be said for the taste of hydroponically grown bud too — it loses some of the 'natural' flavour you get from organically grown plants, which comes down to personal preference.

Growing Medium FAQs

What is the best growing medium for beginners?

Soil is generally the best starting point for new growers. It's the most forgiving of pH swings and feeding mistakes, and it's the cheapest way to get growing.

Can I mix different grow mediums together?

Yes. Coco coir and perlite blends (commonly 50/50 or 80/20) are a popular example, giving you better drainage and aeration than coco alone while keeping the medium easy to manage.

Is hydroponics better than soil?

Hydroponics can produce faster growth and bigger yields, but it demands tighter pH and nutrient control and higher upfront cost. Soil is more forgiving and better suited to those just starting out.

Does perlite work in every growing medium?

Perlite improves drainage and aeration in soil, coco coir, and hydroponic setups alike, since it's inert and pH-neutral. It's one of the few additives that suits almost any medium.

How do I know if I should switch growing mediums?

If you're consistently fighting pests in soil, or find yourself wanting faster cycles and more nutrient control, moving to coco or a soilless mix is usually the next logical step before trying full hydroponics.

All seeds are sold for novelty and souvenir purposes only. Skyline Smoke Company supports responsible and legal use and does not condone illegal activity — customers are responsible for complying with the laws of their country. See our Seed Bank Germination Policy.

Looking for the Perfect Growing Medium for Your Needs?

Here at the Skyline Grow Shop, we specialise in a complete range of quality growing mediums that cover everything you need, no matter which way you choose to grow.

Be sure to visit our online store to see more of our range.