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growing cannabis in a polytunnel

Many folks in northern latitudes start their seeds indoors in April under grow lights and transfer them to a greenhouse in May. Your own schedule will depend on your climate and growing season, of course.

Whether you’re raising cannabis as a cash crop or just for personal use, you have many options for where and how you grow it. It’s possible to grow pot outdoors, indoors or in a greenhouse or high tunnel.

In many ways, growing marijuana in a greenhouse or high tunnel offers the best option. An outdoor marijuana greenhouse or high tunnel lets you take advantage of some of nature’s benefits, like abundant sun, without having to kneel to nature’s bad side, like frost, storms and deer, rabbits and other pests.

Once you have purchased or built your greenhouse or high tunnel, you’ll need to decide where to put it. Generally, a spot with southern exposure is best. This will provide a steady source of growth-inducing sunlight to your plants. You may also want to locate your high tunnel or greenhouse in an inconspicuous spot to deter thieves, vandals and other troublemakers.

Growing Marijuana in a High Tunnel or Greenhouse

Plants will usually begin to flower around the summer solstice, the longest day of the year. Flowering will continue for two or three months till they are ready for harvest.

Like greenhouses, high tunnels shelter plants from the elements. They differ from greenhouses, however, in that they are more passive. Generally, greenhouses provide heat and ventilation through electrical systems, while high tunnels rely on passive ventilation systems for moving air and on the sun for providing warmth.

You will want to be sure to give your cannabis plants adequate amounts of water and fertilizer to ensure steady, strong growth throughout the season. A drip irrigation system can supply these essentials reliably and economically. has an entire section on the best irrigation products to grow cannabis.

Greenhouse vs. High Tunnel

Of course, that means high tunnels cost significantly less than greenhouses. How much less depends on the options you are looking for. A variety of high tunnel greenhouse kits and traditional greenhouse kits are available for purchase. If you are handy and looking to save, you can also assemble your own high tunnel or greenhouse with some basic materials.

Generally, two basic options are available for growing your pot plants. You can grow each marijuana plant separately in its own container, or you can put the plants in the ground. Using containers will make the plants easier to work with and to move if you want to transplant them.

Growing cannabis in a polytunnel

These plants can often produce over 1 Kg of cannabis from a single plant. However some cannabis growers prefer the flexibility of growing their plants on containers, this allows them to move the plants if required.

This can mean replacing all the soil with quality compost from the local garden centre. Or you may just need to add some manure, organic fertilisers, bat guano etc. In dry areas some people add water-absorbing crystals to the soil to allow the soil to hold more water than normal.

Many garden centres offer ‘Soil testing kits’ which allow you to determine soil quality, pH etc and will also suggest recommended soil improvers. The most successful greenhouse cannabis growers know that a small amount of time spent optimising the soil conditions will encourage outstanding cannabis plants with heavy harvests of potent buds.

2. Optimise the soil

Temperatures inside a greenhouse or polytunnel are often a few degrees warmer than outdoors, allowing the cannabis plants to grow faster, larger and stronger.

Above, Frisian Dew in a legal European greenhouse grow

Expert Tips : Cannabis greenhouse growing

Give the glass a wash and remove garden waste from inside the greenhouse. The most successful greenhouse growers often produce a years supply of cannabis from an average family greenhouse, keep the greenhouse clean and it will provide great growing conditions for the cannabis plants. Ensure that the greenhouse gets as much sunlight as possible

The greenhouse protects the maturing cannabis plants from torrential mid-summer storms which can sometimes damage outdoor crops in exposed locations. The greenhouse also provides protection from the often cold and stormy autumn conditions which can damage the final harvest.

Growing cannabis in a polytunnel

Plants that are established in the ground clearly can’t be moved, yet will endure well in any condition, when you are away for possibly 14 days.

Disposing of the stickiness

Feminized cannabis seeds and polytunnels

Guaranteeing air development and customary air changes in your nursery is significant. A portion of the strategies used to keep your nursery cool will likewise decrease mugginess. Having movable rooftop vents which can open to discharge sticky air is extraordinary assistance. Having a through-draft on account of an open nursery entryway is likewise a smart thought.

Genuine autoflower cultivators will delve in a lot of excrement and manure toward the finish of each developing season to guarantee advanced soil quality for the next year’s crop. One way of planting your weed correctly into the ground is that you can develop huge plants with unhindered root space. It’s a single direction to get XXL harvests. Some nursery cultivators, when utilizing the best cannabis seeds, locate that a solitary plant can possess the whole nursery and once in a while even come up short on space.

Polytunnel development of cannabis seeds; Utilizing pots versus planting into the ground directly

Polytunnels can be warmed whenever required. This enables you to improve the autoflower condition regardless of whether you have sudden ices or stormy climate. It additionally enables you to sprout your cannabis seeds sooner than you may accomplish for outside growing. With a tad of thought and arranging, developing cannabis seeds in a polytunnel can be a protected, secure and pleasurable path for the home-cultivator to act naturally adequate in recreational or medicinal cannabis. Polytunnel developed cannabis is staggeringly powerful when developed from great cannabis seeds. It’s nothing unexpected that more individuals than any time in recent memory are growing autoflower cannabis in polytunnels and getting a charge out of the advantages.