Grapefruit Auto by Fast Buds: Strain Review

Grapefruit Auto dried and cured bud

Grapefruit Auto buds ©GrowDiaries ©The_Growery

Grapefruit Auto by Fast Buds offers a delightful smoking experience with its consistent fruity and citrusy aroma, matching its flavorful taste. Users can expect a balanced, moderately potent high, leaning towards Sativa effects, resulting in relaxation, euphoria, happiness, and an uplifting mood. This strain’s versatility makes it suitable for various occasions, including a wake-and-bake option, and its potential for stress relief and mood enhancement adds to its appeal.

Average Rating

8.6 average based on 61 harvests.*

User Ratings
(18 reviews)
(17 reviews)
(17 reviews)
(6 reviews)
(3 reviews)
(1 reviews)


The aroma of Grapefruit Auto by Fast Buds is predominantly citrusy and fruity, with hints of sweetness, sourness, and diesel. Users consistently mention the fruity and citrusy scent, making it a standout feature of this strain. While some users noted variations in the aroma, the common theme is the presence of a strong and pleasant fruity fragrance.

The buds absolutely reeked of a sweet grapefruit at the end of the flower…it’s very citrusy.


Very intense fruity gassy smell, best smelling bud I’ve grown.


Beautiful Strong Aroma of sweet and sour Grapefruit!


Smells so fruity…well two of them do…it’s a fruity smoke.


Grapefruit Auto: Most Commonly Reported Flavors

Based on 62 reports

Grapefruit Auto: What flavors can you expect? ©


The taste of Grapefruit Auto aligns with its aroma, offering a delightful combination of citrus and fruity flavors.

Love the pungent citrus/fuel aromas…as they hang for drying.


Orange peel and Berries…it’s a fruity smoke.


Grapefruit sweet flavor is amazing.



Grapefruit Auto by Fast Buds appears to deliver a balanced blend of effects, with a slight leaning towards Sativa dominance. Users report feeling relaxed, happy, and uplifted, indicating a positive and mood-enhancing high. The strain is noted for its moderate potency, making it suitable for various occasions.

Grapefruit Auto: Most Commonly Reported Effects

Based on 62 reports

Grapefruit Auto: What effects can you expect? ©

Potency: The strain’s potency received high ratings, with many users giving it a 9/10 or 10/10.

Sativa/Indica Balance: Most users described the effects as leaning towards Sativa dominance, with reports of 100% Sativa and 50% Sativa effects being the most common.

Grapefruit Auto: Sativa/Indica Balance

Based on 62 reports

Grapefruit Auto: What’s the sativa/indica balance? ©

Type of High: Users report an initial uplifting and clear-headed high, followed by relaxation. Some users also mentioned creativity and motivation as initial effects.

Best Time to Use: While there isn’t a unanimous agreement, it’s often suggested as suitable for different times of the day, including wake-and-bake scenarios. Its energizing and mood-enhancing qualities make it versatile.

The effect is similar to the other one but this one is clearly attacking the size of your eyes, so you’ll have red & small eyes. That one is relaxing but with a stone effect at the end. It’s harder to resist and you’ll get that sleepy/stone effect that is perfect when you know how to manage it.


The stoned feeling lasts for about 2 hours, hitting hard at first then fades slowly. For me, it’s a creative euphoric buzz that relaxes but won’t hold you back. I’ve been smokin this all day and love it.


The high feels more sativa heavy and packs a punch. Really uplifting, great for an evening of your favorite music.


Day or night stuff, great boost of energy.



In summary, Grapefruit Auto by Fast Buds consistently offers a fruity and citrusy aroma and taste, with a majority of users enjoying the flavor profile. The strain provides a balanced and potent high, leaning towards Sativa effects, making it versatile for various occasions and potentially useful for mood-related issues. Overall, it appears to be a well-received and enjoyable cannabis strain among users.

Grapefruit Auto Cultivation Info

In our recent analysis of data collected from 62 growers cultivating Grapefruit Auto, a significant consensus emerged regarding the strain’s cultivation patterns. Approximately two-thirds of the participants reported that they found Grapefruit Auto to be an easy-to-grow plant, highlighting its user-friendly nature. Remarkably, almost nobody considered it a high-maintenance strain, indicating its suitability for both novice and experienced growers.

Grapefruit Auto Ease of Growing

Based on 62 grows

Grapefruit Auto main cola

Grapefruit Auto: Is it Easy to Grow? © Photo: Green_Blood

Our analysis also shed light on the robust genetics of Grapefruit Auto, with a majority of participants expressing confidence in the genetic strength of the strain. Only a mere three growers perceived the genetics as weak. This positive feedback bodes well for individuals seeking a hassle-free and reliable cultivation experience with this autoflowering Grapefruit.

Grapefruit Auto Seed-to-Harvest Time

Drawing insights from grow experiences documented on, the seed-to-harvest time for Grapefruit Auto ranged from 8 to 19 weeks, with an average of 11.2 weeks. A significant portion, nearly a quarter, reported an 11-week cycle duration, establishing it as the most common timeframe, and about half of the grows required even less than 11 weeks.

The vegetative stage displayed less variability, with nearly a third of plants spending 4 weeks in veg, aligning with the strain’s average, and a notable prevalence of longer vegetative durations compared to shorter ones.

For outdoor grows, data from 8 instances indicated an average cycle duration of 10.9 weeks. Although the sample size is smaller than indoor grows, the similar average duration suggests that Grapefruit Auto demonstrates consistent performance across different environments.


Weeks Spent in Veg and From Seed to Harvest

Based on 61 grows

Veg and Cycle Duration Statistics ©

Weeks Spent in Veg and From Seed to Harvest Outdoors

Based on 8 grows

Outdoor Veg and Cycle Duration Statistics ©

Do Different Mediums Affect Cycle Duration?

Based on 60 grows

Cycle Duration vs Mediums Statistics ©

Does Training Affect Cycle Duration?

Based on 61 grows

Cycle Duration vs Training Statistics ©


In an attempt to discern a connection between the duration of the grow cycle, cultivation mediums, and training techniques, the results, illustrated in the charts above, reveal a lack of a consistent pattern. One observation is evident regarding hydroponic grows: in most strains, hydroponic cultivation tends to prolong the life cycle, and Grapefruit Auto is no exception. While the exact reason remains speculative, one hypothesis is that hydroponics may facilitate the development of a larger root ball, contributing to an extended growth period for the plants.

Grapefruit Auto Flowering Time

Available data reveals a flowering time ranging from 4 to 12 weeks, with an average duration of 6.7 weeks. The most prevalent flowering period fell within the 6-7 week range, underscoring the strain’s tendency for a relatively swift and efficient flowering stage.

Flowering Time In Weeks

Based on 61 grows

Grapefruit Auto: Flowering Time Statistics ©

The sample size for outdoor cultivation remains modest, with data from 8 grows indicating an average flowering duration of 7 weeks. While this smaller dataset suggests a slightly longer flowering period outdoors, the overall trend aligns with the strain’s reputation for a timely and rewarding flowering phase, making Grapefruit Auto an appealing choice for growers seeking a balance between efficiency and quality yields.

Grapefruit Auto Height

The average height of Grapefruit Auto at harvest stood at 58 cm. Notably, the 8 outdoor grows in the dataset reported an even lower average height of 51 cm.

Analyzing the influence of growers’ interventions on plant height, it’s evident that plants left untrained generally exhibited greater height but not in this case. Low-stress training emerged as the most effective technique for controlling canopy height consistently (minus a couple of exceptions), while the results of topping were a bit more unpredictable.


Final Height at Harvest

Based on 56 grows

Height Statistics ©

Final Height at Harvest Outdoors

Based on 8 grows

Outdoor Height Statistics ©

Does the Choice of Medium Affect Height?

Based on 55 grows

Plant Height vs Medium Statistics ©

How Does Training Affect Plant Height?

Based on 56 grows

Plant Height vs Training Statistics ©

Height (cm) vs Pot Size (liters)

Based on 52 grows

Plant Height vs Pot Size Statistics ©


Exploring the relationship between cultivation medium and final plant height, an interesting pattern emerged. On average, plants tended to be smaller in soil and significantly taller in hydroponic grows. Contrary to expectations, pot size proved to be an unreliable predictor of final height. While a general upward trend in height was observed with larger pots, there were notable fluctuations, challenging the assumption that pot size consistently dictates the ultimate stature of Grapefruit Auto plants.

Grapefruit Auto Yield

Drawing insights from 44 available grow records, Grapefruit Auto demonstrates a diverse range of yields, with plants producing between 9 and 233 grams. The average time from sprouts to harvest was approximately 11.2 weeks, resulting in an overall average yield of 60 grams per plant.

Noteworthy differences in average yields were observed across various cultivation mediums. Hydroponic grows exhibited the highest average yield at 138 grams, followed by coco coir with an average of 75 grams, and soil with an average of 56 grams. This suggests that the choice of medium significantly influences the overall productivity of Grapefruit Auto plants.


Dry Per-Plant Yield in Grams

Based on 41 grows

Yield Statistics ©

Dry Per-Plant Yield Outdoors

Based on 7 grows

Outdoor Yield Statistics ©

Does the Choice of Medium Affect Yield?

Based on 40 grows

Plant Yield vs Medium Statistics ©

Do Training Techniques Affect Yields?

Based on 41 grows

Plant Yield vs Training Statistics ©

Yield (grams) vs Pot Size (liters)

Based on 39 grows

Plant Yield vs Pot Size Statistics ©


The type of training employed emerged as a less reliable predictor of productivity. Whether trained or left alone, Grapefruit Auto plants displayed more or less the same average yields. A few outliers were observed among low-stress trained specimens, but this could be a fluke.

In outdoor settings, Grapefruit Auto demonstrated an average yield of 27 grams based on 7 recorded grows. These results are comparatively lower than indoor ones, so make sure your outdoor gardens offer enough sun and warmth if you want to achieve good yields..


Is Grapefruit strain good?

Yes, the Grapefruit strain is well-regarded for its pleasant aroma, distinct citrus flavor, and a balanced hybrid effect, making it a popular choice among cannabis enthusiasts.

How much does Grapefruit Autoflower yield?

The yield of Grapefruit Autoflower varies, but based on available data, it may produce between 5.0 and 233.0 grams per plant, with an average yield of 57 grams per plant.