How To Grow Hemp In A Greenhouse

You’re ready to start growing hemp, and have decided you want to start with seeds in a hemp greenhouse. That’s great! Let’s walk through the benefits, challenges, and how to of growing feminized hemp seeds in a greenhouse. We have more extensive guide here on How To Grow CBD Hemp Seeds in the farm our greenhouse of your choosing.

Benefits of Growing Hemp Seeds in a Greenhouse

In addition to being able to grow year-round, work with extended growing season, and optimizing your yields, one of the biggest benefits to growing hemp seeds in a greenhouse is the control you will have over the environments your seeds are in.

You’ll have more control over:

  • Climate
  • Temperature
  • Weather
  • Watering
  • Soil
  • Light
  • Pests
  • Grow Cycle

How to Grow Hemp Seeds in a Greenhouse

When it comes to how to grow hemp seeds in a greenhouse, you’ll first want to obtain seeds for industrial production from a USDA Certified farm that follows regulations. You’ll want to make sure you pick seeds for a strain that grows well indoors and meets your needs.

Germinating Your Seeds

You’ll want to start by germinating your seeds, which is typically done by placing seeds in a warm paper towel dampened with distilled water and leaving them for a few hours or overnight. After this period, you’ll want to place the seeds on another damp paper towel and set it atop your growing tray in a dark location, and spray with lukewarm water as necessary.


Once the seed has opened and the taproot is a few centimeters long, you’ll carefully plant the seedling in a small pot filled with quality soil. This is where the seedling will start to grow. You’ll want to start providing light to the plant ideally through a high-yield fluorescent or LED for 18-24 hours per day, which you will continue until the plant matures. Watering and food requirements will vary depending on the strain and your greenhouse climate. Make sure you check with your seed vendor for best growth conditions. Most have information on planting density, growth periods, and more on their purchase page.

First Transplant

Once the roots of the seedling reach the bottom of the pot, you’ll need to transplant it into a larger pot, ideally 4-5 inches in diameter, and continue with your water, feeding, and light program.

Final Transplant

When the seedling’s roots reach the bottom of the 4-5” pot, you’ll want to make a final transplant to a larger pot or to a grow bag, where your plant will go through its final maturing stage, until you are ready to harvest.

While growing seeds in a greenhouse is similar to growing seeds outdoors, it’s important to remember that with a greenhouse you have the opportunity for multiple crops in a year-round growing season rather than one crop, and therefore one chance, per year. Make sure you are selecting high quality soil and following watering, feeding, and light guidelines for your strain to ensure your plant reaches maturity and doesn’t go hot.