Greenhouse Seeds

What are greenhouse cannabis seeds?

Greenhouse cannabis seeds are able to be grown inside a greenhouse at Dutch, or similar, latitudes. You can choose between fast growing autoflower seeds or heavy yielding feminised seeds. Regular cannabis seeds are also available.

Buy greenhouse cannabis seeds online

You can buy your greenhouse cannabis seeds easily and safely online with Dutch Passion. Our customer service team have been successfully helping people since the 1980’s. The range of cannabis cup winning genetics are fully proven with thousands of satisfied customers. Buy in confidence from one of the world’s most experienced cannabis seed companies.

Best feminised cannabis seeds for greenhouses

Dutch Passion were the original inventors of feminised cannabis seeds back in the 1990’s. No-one knows more about the breeding and production of high quality feminised seeds! The best cannabis genetics should provide consistent, dependable growth with heavy yields and an excellent cannabinoid/terpene profile.

Frisian Dew

Frisian Dew is one of Dutch Passion’s most successful greenhouse/outdoor feminised cannabis cup winning seeds. She can produce high yields under good greenhouse conditions with heavy branches which may need supporting at harvest. In the northern hemisphere at Dutch latitudes she is usually ready to harvest in a greenhouse around early October.

Passion #1

Passion #1 is a Californian Indica which can grow to 3m tall (and almost as wide!) in good greenhouse conditions. This is one of the most potent greenhouse feminised seeds, THC levels can be around 20% qualifying this strain as part of the exclusive family of Very High THC cannabis seeds.

Durban Poison

Durban Poison is a cannabis cup winning greenhouse classic with fully proven South African sativa genetics. She also grows well in full outdoor conditions or indoors. With heavy yields of powerful cannabis and a trademark aniseed taste, this is one of the most reliable high quality greenhouse seeds you can grow.

Best autoflower cannabis seeds for greenhouses

Autoflowering cannabis seeds are a fast and convenient choice for any greenhouse grower. They typically grow from seed to harvest in around 80-90 days depending on the specific strain and the grow conditions. Greenhouse autos tend to reach around 1 metre tall with heavy side branching. Expect the same quality levels as those from feminised cannabis seeds, though harvests will be a little lower due to the shorter grow cycle.

Auto Mazar

Auto Mazar is a proven greenhouse autoflower seed choice. Part of the Afghani Kush cannabis seed family, these genetics are tough and durable. In a greenhouse at Dutch latitudes she takes around 12-13 weeks to grow from seed to harvest with a powerful high and a rich hashy taste.

Auto Duck

Auto Duck is the go-to strain for any greenhouse grower wanting a greenhouse autoflowering seed with unique natural self-camouflage. The leaves have webbed fingers, life a ducks foot print. This removes the instantly identifiable cannabis leaf shape. Squeeze an Auto Duck or two in the corner of your greenhouse and no-one will know! Part of the Dutch Outdoor cannabis seed collection.

Auto Cinderella Jack

If you want to aim for the highest possible THC levels you need seeds of the worlds strongest autoflower - Auto Cinderella Jack! With THC levels independently recorded at over 25%, Dutch Passion have never seen an auto with higher THC levels.

Autoflower seeds and greenhouse cultivation

Note that all the Dutch Passion autoflower seeds will grow well in a greenhouse. Throughout the warm, sunny weather they will thrive. During the hottest days, it will help your plants avoid the worst of the heat if you use a greenhouse shade. Good ventilation is also important in warm weather. It’s also important to ensure good ventilation during damp days, especially mornings where there is dew and moisture on the plants.

Best regular cannabis seeds for greenhouses

Regular cannabis seeds give rise to roughly equal numbers of male and female cannabis seeds. They are often the preferred seed choice for old-school growers or those seeking to make their own hybrids and crosses

Shaman

Shaman is a proven regular greenhouse cannabis seed using Skunk x Purple genetics. These sativa greenhouse genetics are typically ready to harvest around early October in the northern hemisphere.

Hollands Hope

Hollands Hope is a cannabis cup winning indica strain with high THC levels. She is perfectly suited to cool, damp grow conditions in a greenhouse or outdoors. With powerful effects and a delicious old school taste/aroma, Hollands Hope has been a proven greenhouse favourite for decades.

Purple #1

Greenhouse cannabis growers that love a captivatingly beautiful purple strain with heavy yields will enjoy Dutch Passions original Purple #1. This is a purple Afghani hybrid with thousands of repeat growers. The blooms are long and heavy often with deep purple buds, a delicious taste and a soothing, satisfying/powerful effect.

How to choose the right cannabis seeds for greenhouse growing?

Decide which cannabis seeds best suit you and your greenhouse grow plans. Autoflowering cannabis seeds may not have quite the same yields or plant size as photoperiod feminised seeds. But they will be ready to harvest much earlier and the relatively small size could be convenient for some greenhouse growers.

Think carefully about the cannabis genetics which most appeal. Do you want to grow satisfying weed with a great aroma? Is the bag appeal of colourful buds your most important priority or perhaps you just want to aim for the highest possible THC levels?

What is the average flowering time of strains suited for greenhouses?

Photo-dependent cannabis seeds (regular or feminised seeds) often take 5-6 months to complete their greenhouse grow cycle, depending on the genetics and latitude. Autoflowering cannabis seeds can be ready much faster, in as little as approximately 80 days. Yields may be lower with autoflower seeds, but multiple successive greenhouse crops are possible in the same season.

What is the average yield of cannabis seeds suited for greenhouses?

Much depends on latitude, conditions, soil quality, grower experience and cannabis genetics. Autoflowering cannabis seeds can yield anything from 20g from a small plant to 200g from a large auto grown in optimised conditions. Photoperiod cannabis seeds can yield from 50g from a small plant to well over 1-2Kg of dry buds from a 4 metre-tall monster grown in ideal greenhouse conditions.

What are the optimal conditions to grow seeds in a greenhouse?

Professional cannabis growers focus heavily on soil quality. If local soil is poor, supplement with high quality soil from a garden centre. Many growers will dig well-rotted manure into their soil along with other soil improvers (worm castings, bat guano, seaweed etc) to provide a healthy and beneficial growing medium.

Temperatures should be controlled to avoid extremes. Greenhouse heaters should be used on cold days and nights. Auto-opening greenhouse windows should be used to minimise extreme high temperatures on sunny days. Professional greenhouse growers use supplemental LED lights which auto-adjust light output according to ambient sunlight conditions. Experienced greenhouse growers will also monitor and control humidity.

Growing cannabis in a greenhouse really is simple. The greenhouse protects your plants from the worst of early spring weather as well as safeguarding your plants from cold, stormy late season weather. If you can provide some good quality cannabis seeds you can expect a successful grow!