8 Challenging Strains for Ambitious Growers

1. OG Kush

OG Kush has a reputation for potency—and for keeping growers on their toes. While its 26% THC levels and stress-melting effects have broad appeal, growers who don’t mind a little vigilance generally produce the finest harvests.

A West Coast hit for decades, OG Kush generated buzz early on thanks to its resinous, dense buds. This said, its flowers can also trap moisture easily, especially as they put on significant weight. Providing your plants with plenty of fresh air can make all the difference and ensure a harvest that reflects this strain’s true power. 

We recommend placing oscillating fans above and beneath the canopy to encourage an even, gentle breeze. Some selective pruning during the mid-flowering stage can also prevent moisture from lingering too long around the bud sites. While every grow is different, many fans of this strain stick to relative humidity levels of around 50% during the vegetative stage and 30-40% throughout the flowering process.

2. Face Off OG

The Face Off OG strain is mellow, bubbly, and filled with light-hearted glee. Its psychoactive qualities harmonize with its citrus, woody notes, promoting an immersive high. While it does require a greater level of patience and care, fans of this strain say its happy-go-lucky nature makes up for its finicky growing style.

In true OG fashion, it has a squat, compact stature. While this structure is great for smaller spaces, it can pose some challenges. Its thick, interior foliage can block light and airflow if left unchecked, particularly in the center of the plant. This said, some early intervention allows growers to sidestep potential hurdles before they become an issue. 

Many cultivators of this strain prefer to use low-stress training, which involves gently tying the branches down to encourage outward growth. They also find that selectively removing weaker interior shoots can significantly improve airflow and light penetration before flowering even begins. As the buds develop, they put on considerable weight, so it can be helpful to physically support the branches by trellising your plants or propping them up with wooden stakes.

3. Fire OG

The Fire OG strain captivates fans with joyful effects and a refreshing pine scent. At 22% THC, it holds its own among high-potency strains and is praised for its simmering, psychoactive high. As an indica-dominant hybrid, it also appeals to growers who prefer lulling, weighty effects.

On the flip side, its longer flowering time of up to 70 days does demand a certain level of patience. It can also be sensitive to humid climates and doesn’t put up much of a fight against mildew. Thinning the foliage gradually throughout the growing process can help avoid potential setbacks by providing clean, fresh air.

Even with these hurdles, few forget their first Fire OG harvest. This strain produces eye-catching flowers, has a sharp, lemon-like bite, and routinely delights growers, especially those who take a careful approach to the cultivation process.

4. Animal Cookies

Deeply mellow, this strain is famous for its late-night, laid-back vibes. It also has glimmers of sugar and spice, which further add to the overall high. If we judged by its name alone, we might think of its growing style as simple and sweet. In reality, Animal Cookies has a bit more attitude, but its high-stakes nature shouldn’t dissuade prospective growers. While no one trait demands tons of attention, it does have a sprinkling of needs that require a solid growing plan.

For example, this strain doesn’t just prefer consistent humidity levels and temperatures; it requires them to truly thrive. The Animal Cookies strain develops weighty flowers—and a healthy appetite. For this reason, routine feedings are key to achieving an impressive harvest.

Keeping your Animal Cookies plants slightly drier during the flowering stage is also important, as this strain can be susceptible to mold. Gentle defoliation around crowded bud sites can help improve airflow while avoiding the longer recovery times associated with traditional pruning. Dry conditions can also help boost this strain’s trademark taste and fragrance, which are often described as doughy and mildly sweet.

5. Headband

As the offspring of OG Kush, it’s no surprise the Headband strain has also made our list of the best cannabis seeds for advanced growers. Its slightly longer flowering time can take up to 10 weeks. While sativa-dominant strains tend to be taller in general, Headband can sometimes stretch aggressively once flowering begins and reach heights of up to 10 feet. For these reasons, it requires a greater time investment and a larger growing space. 

While it thrives outdoors, some indoor growers opt to transition into the flowering stage earlier than they normally would, as flipping early can help manage this plant’s height. Carbon filtration is also key, as this strain can become intensely pungent.

6. ACDC CBD

We wouldn’t necessarily call it a highway to hell, but the experience of cultivating the ACDC strain isn’t exactly easy. As a perfectly balanced hybrid, this strain merges indica chill with sativa pep, but its real defining trait is its exceptional 15% CBD levels. While this level is considered moderate when it comes to THC, it’s actually quite high in the context of CBD. As such, this strain is deeply calming and serene.

It can also be somewhat temperamental when it comes to temperature. The best approach is to use a thermostat and ensure your grow space remains somewhere between 68–78 degrees Fahrenheit. Sudden swings outside that range can stress your plants. Many growers also avoid heavy feeding schedules with ACDC CBD. Instead, take the more is less approach, increasing nutrients gradually and seeing how their plants respond instead of jumping straight to the full amount.

7. Neville’s Haze

Successful growers of this strain anticipate its next move and often train aggressively before flowering begins. Topping and vigilant canopy management are basically mandatory unless your grow room has a ton of vertical clearance. 

Yet, many growers take on these challenges without batting an eye. Despite its high-maintenance style, it maintains an unflinching fanbase, which, in our book, says more about this strain than anything else.

8. Thai

This sativa landrace is timeless. A legendary wake-and-bake, it’s often referred to as the espresso of cannabis strains thanks to its crystal-clear high. For these reasons, many growers consider its challenging nature a worthy trade-off.

The Thai strain is well known for its towering growth and slower flowering time. It generally performs best when growers plan for its size ahead of time. For instance, topping your plants early on is a very effective way to curb this strain’s height. Providing ample space for root development and strong, consistent lighting are other key ways to help this powerful strain reach its full potential.