Climatic and Ecological Conditions Required for Hemp Cultivation

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Hemp growingAfter passing the 2018 Farm Bill, the cannabis industry has gained much attention from many stakeholders. Several states have now legalized the cultivation of hemp for medical use. We have also seen 11 states legalize the recreational use of cannabis. The current trend has created a new opportunity for farmers in the United States. But many still need to learn the ideal climate for growing hemp.

Investors who want to focus on the hemp industry as farmers who want to do away with traditional crops like soybeans are all eyes on hemp. Some farmers have gone ahead to try the crop but need more information. Unfortunately, some have made huge losses due to the need for climatic and ecological requirements for hemp.

Requirements to Grow Hemp

Before we talk about climatic conditions, we need to understand the requirements for the cultivation of the crop:

  • Hemp should be legal in your state for you to undertake the cultivation
  • Fulfill the provisions of your state cannabis regulations to get a license

The regulations differ from one state to another. Some states, like Iowa, are yet to legalize the cultivation of cannabis as a crop. If you want to undertake hemp farming, here are the ideal climatic conditions for the crop to thrive.


You can grow the crop in a wide range of soils. Hemp does well in aerated soils with a pH of 6 and above. The soil should be deep to allow firm root growth. The essential minerals in the ground for hemp cultivation are phosphorus, calcium, and sulfur.

The soil should be well drained because hemp is affected by floods. The crop is prone to destruction from floods. However, you should ensure the plants are well irrigated, especially during the flowing stage. You should apply NPK fertilizers to suppliant the soil nutrients. At an early stage, the plants require nitrogen in plenty. During the flowering stage, hemp requires phosphorus and potassium to increase its yields.

Soil Testing

I think it’s best to keep testing the soil to determine any deficiencies. You should also eradicate mold if noticed in the soil. Industrial hemp also absorbs cadmium from the soil, which is a pollutant. It would be best if you did not plant consumption crops in soils with high compound levels. Hemp is rarely affected by any pests, weeds, or diseases. Therefore, there is no need for herbicides or pesticides. The best soil for growing hemp is loam, but it also does well in other soils if conditions are moderate.


Hemp does well in areas that receive rainfall of about 600 mm per annum, distributed throughout the year. During the initial stages of growth (up to 4 weeks), the crop may require extra water through irrigation. You can water the plants twice a day and decrease the watering consistency when the plants are established.

It is important to note that hemp helps to reverse the effects of global warming. The plant absorbs a high amount of carbon from the atmosphere. It also helps to prevent soil degradation through erosion because of its firm roots.

Temperatures and Light Intensity

Hemp can thrive in temperatures around 650 F in the establishment stage. The soil temperature should be ideal for seed germination (around 450 F). The seeds germinate within 1-2 days and sprout after a week. After establishment, the plant can withstand adverse temperatures. The plant foliage prevents the evaporation of soil water.

The ideal light conditions for hemp growing are easy to attain as long as the crop is not under a shade. In indoor cultivation, the greenhouses should allow enough light to penetrate to keep the plants healthy.

Crop Spacing

Hemp seed density is dependent on the purpose of the crop. If you are planting the crop for fiber, you should plant the seeds close together. The high seed density encourages vertical growth, which is ideal for thread. The plants will produce fewer seeds but will take a long time to produce high-quality fiber. The close planting also discourages the growth of weeds on the farm. However, your soil should have high nutrients and be well aerated and drained to support close spacing.

If you want high seed or flower yields, you should also space the seeds to allow lateral growth. You can request the services of an extension officer to guide you on correct spacing depending on nutrients in the soil.


The best climate for growing hemp is found in most parts of the world. It does well in southern and northern America, most parts of Africa, Asia, Europe, and Australia. Improvement in hemp farming technology has also created new opportunities. The crop can grow in a controlled indoor environment for maximum yields. Researchers are also working to invent new strains which can withstand extreme conditions like cold or drought.

State governments also offer free extension services to farmers who want to cultivate the crop. You can seek advice on the soil or local climate condition to determine whether it is feasible to grow hemp in your area.