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  • Cory Morrison

How to grow industrial hemp well in various climates and conditions?


Do you want to farm hemp to make a difference in a world where natural products aren't used as often as they should be used? It is easy to do just as long as you consider some factors. What is the soil like? Is my area getting too much or too little rain? Do I have good lighting and enough room indoors?

General soil conditions

One of the first things to consider when you grow hemp is what is the soil like?

Hemp grows best when the PH is over 6.0 in acidity. Between 7.0 to 7.5 is the most preferred range for growing. Too much or too little acid can prevent proper growth.

Another factor to consider is how much clay is in the soil. Too much clay can mean a lower produced yield of fibre or grain. In addition, hemp does not respond well to soil compaction, which means particles will be too close to each other to allow substantial growth, and clay soils are vulnerable to soil compaction.

Wet compacted soil
(Photo credit: The Ian/Unsplash)

Too much water is also a big deal because of social compaction. Uneven and low-quality hemp is the result you'll get when it's too moist. The more even and richer hemp is, the better it can free people from disease.

Growing hemp outdoors


Something to keep in mind when you plant hemp outdoors is that the planting rate is 400,000 per acre or about 100 plants per square meter. This is so you can effectively organize your hemp over vast distances.

We talked about how too much rain can mean compacted soil. So, what is the ideal amount of rain for superior hemp growing? A good amount of rain in a growing season is 300 to 400 millimetres or 10 to 13 inches. Indeed, deviations in average amounts of rain can impact the environment and disease more than many realize.

What should I do when the soil is too dry? You should pay attention to how often you control weeds and moisturize soil to minimize surface evaporation.


Are Cuba or Jamaica good places to grow hemp? It's never winter down there, right? The answer might be different from what you expect, but no, these aren't particularly good places to grow hemp. First off, daytime highs between 25°C (77°F) and 28°C (83°F) are most effective for growing hemp. As we know, a good portion of the year has highs above 28°C in the Caribbean. Secondly, these areas have low temperature spreads from day to night.

Most of the Southern U.S. for much of the year and Canada during the warmer season months are better places to grow hemp because there are larger daily temperature spreads while also frequently seeing highs between 25°C and 28°C. See Havana, Atlanta and Toronto climate normals for examples.

Growing hemp indoors

Artificial lighting is crucial for indoor hemp growing because it’s easier to keep track of how well plants and flowers grow in the environment.

Growing hemp indoors
(Photo credit: Alex Diaz/Unsplash)

It is essential to consider all planting stages, which include germination, seedling, vegetative and flowering. In addition, pay close attention to air circulation, humidity, light temperature and water to see if conditions are well-suited for growth.

Also, appropriate indoor growing temperatures can range from 16°C (60°F) to 27°C (80°F), and indoor humidity should vary from 40 to 70%. However, it may also depend on what stage the growing is in. Regardless, the light should almost always be on, and there should not be too much water.

How to know whether to plant hemp outdoors or indoors

Infographic credit: Cory Morrison/Canurta

In addition, questions you could ask yourself when deciding whether to grow hemp outside or inside are, "Does it matter more that I get a lot of hemp produced? Or are a few high-quality hemp more important?" Are ideal growing conditions possible in my house or workplace?", "What's the weather forecast this week?" or "Are there enough employees in the greenhouse to frequently inspect hemp?"

Real-life example of hemp troubles

Since more than 75% of the Western U.S. is presently seeing drought conditions, little rain has meant that producers have intense difficulty growing hemp.

Drought low soil moisture
(Photo credit: Wolfgang Hasselmann/Unsplash)

The drought has also led to market and price issues. Numerous hemp growers do not only have limited acreage for growing hemp because of less-than-ideal soil conditions but looking for places to grow hemp has also been harder.


Growing hemp can be as easy as mowing a lawn or as challenging as making recreational plans on a rainy week, depending on how ideal indoor and outdoor conditions are for growing hemp. Your area's general climate is also an essential factor.


Carolinabis. Indoor Hemp Yield- Growing Hemp Indoor vs. Outdoor Climate Havana (Cuba)

Climate CoLab. Growing Hemp

Environment Canada. Canadian Climate Normals 1981-2010 Station Data. Toronto Lester B. Pearson Intl’l A * Ontario

Gardeners Supply Company. Growing Hemp 101 A Beginner’s Basic Guide to Growing Hemp Indoors

GGS Structures Inc. Outdoor VS. Greenhouse Hemp Production: Which is Best?

Hemp Technologies Global. Page 83.

National Oceanic & Atmospheric Administration. Summary of Monthly Normals 1991-2020. Atlanta Hartsfield Intl AP, GA US USW00013874

Ontario Ministry of Agriculture, Food and Rural Affairs. Growing Industrial Hemp in Ontario

Oregon State University. Planning a Drought Resilient Hemp Crop

Successful Farming. 10 Common Questions About Hemp Farming

Successful Farming. What Farmers Need to Know About Growing Hemp

U.S. Drought Monitor

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