These 8 cannabis strains make novice growers give up

This article, originally published in 2017, was completely rewritten and updated in June 2026.

The latest cannabis strains are generally designed to be forgiving of mistakes. breeders select robust, short-blooming plants that are tolerant to variations in temperature, humidity and nutrients.

But some genetics, mainly from landraces sativas and their descendants, refuse to be tamed. Endless flowering, spectacular stretching, precise climatic requirements, low yields for the time invested: these varieties are all challenges that put off novice growers.

Why are they so difficult? Equatorial sativas have evolved under stable photoperiods and a warm climate. During flowering, they can double or even triple in height, They sometimes require more than 14 weeks before harvesting, and produce airy heads that are more vulnerable to humidity.

Unlike modern indica-dominant hybrids, they require space, patience and fine steering. Here are seven varieties (plus one bonus) known to give you a hard time. To be reserved for seasoned growers, or avoided if you're just starting out.

Comparison table

Dr Grinspoon

A flower from Dr. Grinspoon

Flowering : 11 to 14 weeks - Climate : hot and dry - Yield : low to moderate - Difficulty : 5/5

While the legal market is turning massively to hybrids, let's pay tribute to pure sativas with the Dr Grinspoon. Created by Amsterdam's Barney's Farm, it takes its name from Harvard professor and pro-cannabis activist Lester Grinspoon. It can be recognized by the strange structure of its buds: little «pearls» of calyxes spaced along the stem, more reminiscent of hops than a classic cannabis flower. This reduced density, combined with one of the longest flowering periods in the cannabic reign, makes it a true test of patience. Sensitive to mildew if the air lacks circulation, it requires a warm, dry, well-ventilated environment.

Malawi Gold

A Malawi Gold flower

Flowering : 85 to 120 days - Climate : hot equatorial - Yield : good (if completed) - good (if completed) Difficulty : 5/5

Malawi Gold is one of the the rarest varieties in the world. This landrace straight from southern Africa is considered one of the best sativas on the planet. But European climates don't match its identity: it requires a dedicated growing room when not outdoors in generous sunshine, and organic fertilizer.

Used to a stable equatorial photoperiod, the Malawi Gold The plant stretches strongly and can reach imposing heights. Allow 85 to 120 days of flowering, or almost four months, before harvesting. A marathon reserved for growers with space and time.

Thai Chocolate

A flower of Thai Chocolate

Flowering : ~14 weeks (94 days) - Climate : hot and humid - Yield : low - Difficulty : 5/5

Another sativa. This one comes from Californian breeder Darwoh. Some cannabis historians claim that the original Thai landrace has disappeared; this lover of the genre continues to cultivate it, in particular for making Thaï Sticks.

The difficulty lies in maintenance and flowering time, which approaches 94 days. Its THC content is not excessive, but its relaxing effects soothe over-stressed minds. Like most Southeast Asian sativas, the Thai Chocolate develops an airy structure and marked stretching that complicate management in confined spaces.

Kali Mist

A Kali Mist flower

Flowering : 10 to 11 weeks - Climate : hot, ventilated - Yield : moderate - Difficulty : 4/5

Nicknamed «the queen of sativas», Kali Mist is an award-winning sativa with almost 90 %. Its reputation is due as much to its quality as to its high standards: it stretches enormously during flowering, develops an airy structure and remains susceptible to mildew when humidity rises. Trellising and rigorous hygrometric control are essential if it is to express its full potential. With ten to eleven weeks of flowering, it requires commitment, but rewards methodical growers with a head high a much-appreciated brain-booster.

Colombian Gold

A flower of Colombian Gold

Flowering : 70 to 90 days - Climate : tropical - Yield : moderate - Difficulty : 4/5

The Colombian Gold will bring back fond memories for smokers of the 70s. Native to the Santa Marta mountains in Colombia, it gave birth to the Skunk #1, The genetic basis of countless modern hybrids. As its name suggests, this landrace loves tropical climates, making it particularly difficult to maintain in our latitudes. Its great height, sensitivity to climatic variations and long maturation period (70 to 90 days) make it a challenge for those who want to rediscover the taste of the cannabis of yesteryear.

Jack Herer

A flower from Jack Herer

Flowering : 8 to 10 weeks - Climate : dry Mediterranean - Yield : good - Difficulty : 4/5

A legendary variety named after the activist of the same name, the Jack Herer (Sensi Seeds) is notoriously tricky to grow to its full potential. The problem isn't its hardiness, as it's quite resistant to disease. phenotype variability Depending on genetic expression, the same seed can produce a plant that is either indica or sativa, with different needs and flowering times.

It thrives in a dry Mediterranean climate, and fears excess humidity at the end of the cycle. Patient and attentive, the grower will be rewarded with a generous yield and abundant resin.

Trainwreck

A Trainwreck flower

Flowering : 8 to 10 weeks - Climate : warm temperate, highly ventilated - Yield : generous - Difficulty : 4/5

One of the most powerful and fragrant varieties available: the Trainwreck perfumes the room with the scent of cedar and pine, to the point where odor management becomes a subject in its own right (charcoal filter mandatory indoors). Its vigorous growth, thick stems and stretching require regular training and pruning to prevent spreading. It produces a pronounced resin and, when well cared for - ideally indoors where conditions are under control - offers an abundant harvest. Its therapeutic value (anxiety, pain) makes it a favorite despite its difficulty.

HeadBand

A headband flower

Flowering : 9 to 10 weeks - Climate : temperate, controlled humidity - Yield : demanding - Difficulty : 3/5

The most «accessible» of this selection remains a notch above the average. HeadBand is a cross between’OG Kush and Sour Diesel, The name «Headband» refers to OG × Sour Diesel crosses in California. before the appearance of Karma Genetics' Headbanger, with which it is sometimes confused.

Powerful in THC and surprisingly rich in CBD, it owes its name to the sensation of pressure that consumers feel around the skull, like a headband. As the buds are small, it takes an experienced grower, with a mastery of nutrition and hygrometry, to get a significant yield.

How to succeed with these difficult varieties?

Three principles apply to all these genetics. Anticipate height : trellising, LST or SCROG techniques to contain sativa stretching. Control humidity Ventilated heads are less resistant to mildew than the compact buds of indicas, so constant ventilation is non-negotiable. Last but not least, be patient Cutting a long-flowering sativa too early means sacrificing most of its aromatic and psychoactive potential. These varieties are not made for quick profit, but for enthusiasts in search of authenticity.

Newer strains of cannabis are normally easier to grow, while older strains are easier to harvest. breeders selecting the plants most likely to flourish in the arms of novice growers. While today's technology makes it possible to regulate the temperature, humidity, aeration and acidity of a plantation, some older varieties are not so easily tamed.