What Do You Need to Grow Cannabis Outdoors?

What Do You Need to Grow Cannabis Outdoors?

It is almost springtime, and as the days get warmer, it is a good time to prepare your outdoor garden for 2026. Cultivating cannabis outdoors allows you to guide your plants from seed to harvest over a six-month growing season. This guide explains everything you need to know about growing cannabis outdoors, from choosing the right growing medium and nutrients to understanding watering schedules.

How To Get Your Outdoor Grow Started!

Unlike indoor cultivation that can require investing a lot of cash into grow lights, extraction kits, carbon filters, fans, and ducting, growing cannabis outdoors is much easier and cheaper. There are still lots of important factors to consider when carefully planning ahead, so below is a breakdown of all you need to successfully grow cannabis outdoors.

The Right Growing Medium

This is where your seeds will be planted and where the seedlings will grow. Whether you grow in pots or directly in the ground, your chosen medium should provide nutrients, airflow, and drainage. Many growers blend soil, compost, peat moss, and coco coir for optimal results. My personal favorite organic mix is compost, worm castings, coco coir, and 40% perlite.

A Sunny Location

Choose a location that receives direct sunlight from early morning until evening for the best results. This can be easier said than done and may involve moving pots around your outdoor space to increase the number of hours the plants receive sunlight. Keeping your plants in one location will be better in the long term, so try to find a space where they can grow and become huge.

A Reliable Water Source

Consistent watering is critical as water supports nutrient uptake and keeps plants hydrated, allowing them to transpire effectively through their leaves. It is best to feed seedlings soft water or reverse osmosis water with calcium and magnesium added. Using bottled water is convenient, cheap and gives me peace of mind.

Watering and Feeding Outdoor Cannabis

• Seeds do not require lots of water and depend on oxygen for root growth
• Using a measuring jug will allow you to consistently feed the same amounts
• Seedlings will only need nutrients after the first 2-3 weeks of growth
• Using soft bottled water is best if you only have access to hard water at home
• Pots with soil should only be watered once the pots are lightweight and almost dry
• Water your plants at the same time every day, around 10 am or after 4 pm

Good Quality Cannabis Seeds

Start with high-quality seeds from a reputable brand. You can choose between regular and feminized seeds, and between photoperiod and autoflowering varieties, depending on your goals and climate. 

There are pros and cons to each; however, the most important thing is to make sure your seeds are viable and will germinate without issues, causing you any setbacks.

Autoflowering cannabis seeds are well-suited for outdoors, as they will begin to flower regardless of the light cycle. You will have a short vegetative period of 4 weeks, which means autos can be planted outdoors nearly year-round. 

Organic Nutrients

Outdoor cannabis thrives with organic feeding. Options range from liquid nutrient formulas to natural amendments like worm castings and compost. During the first 4 weeks after germination, you will want to give the plants low levels of nutrients until they are well established and have developed a strong root system.

Pots or Containers

Some growers prefer plastic pots, while others choose fabric pots that encourage air pruning and stronger root systems. Whilst plastic pots are cheap, easy to source, and can be washed and reused, you will be much better off growing your seedlings in a fabric pot. These pots are superb for allowing roots to breathe and grow laterally and around the pot, rather than the root-bound structure that plastic pots produce.

Which Growing Medium Is Best for Outdoor Cultivation?

Choosing the right growing medium is one of the most important decisions you’ll make. Outdoor cannabis plants require a medium that offers strong nutrient availability, excellent drainage, proper aeration, and good water retention. 

Whilst most outdoor growers opt for soil, you can create your own custom mixes, giving you more freedom on drainage, nutrient availability, structure and organic content. Below are the different options to consider.

420seeds recommends that autoflowers do best in light, airy growing mediums with good drainage. Dense, nutrient-rich soils are too much, too soon, and can overwhelm young roots. If you are using soil, choose something simple and seedling-friendly – no need for added fertilizers.

Store-bought soil: Whilst store-bought soil is ready-to-use and often enriched with nutrients and beneficial microorganisms, not all soils are optimal for seedlings. Use a potting mix to avoid overfertilizing the seeds.

Compost: Rich in organic matter, mycorrhizal fungi, and slow-release nutrients such as magnesium. Adding compost to soil and coco coir produces a soft, airy, spongy growing medium that roots love!

Peat moss: An organic medium that retains large amounts of water but has a naturally acidic pH. You need to be careful if you’re growing solely with peat moss. It does not contain many nutrients and should be mixed with soil and compost for the best results.

Coco coir: Derived from the hairs of coconut husks, coco coir is a light, airy, and inert growing medium that contains no nutrients but provides excellent root oxygenation. Many outdoor growers combine these mediums to create a balanced mix, often adding perlite or vermiculite to improve drainage and airflow.

Feature image: A private outdoor garden that contains a wide range of different strains. Photo credit: Stoney Tark.