45 Day Autoflower Seeds

What Are 45 Day Autoflower Seeds?

45-day autoflower seeds refer to autoflowering cannabis strains that complete their flowering phase in approximately 45 days. This places them among the fastest-finishing autoflowers available, as most autoflowering strains typically require longer flowering periods depending on genetics and conditions.

It’s important to note that the “45-day” timeframe applies only to flowering, not the entire lifecycle. Most autoflowers begin flowering around 25–30 days after germination, meaning total seed-to-harvest times usually fall between 55 and 70 days, depending on the strain and growing environment.

These fast-finishing autoflowers are well suited to growers prioritising speed, short growing windows, or multiple harvests per season.

How Long Do 45 Day Autoflowers Take From Seed to Harvest?

While flowering lasts around 45 days, the full growth cycle of a 45-day autoflower typically includes:

• Vegetative growth: ~2–4 weeks
• Flowering: ~45 days

In total, most growers can expect harvest readiness in 8–10 weeks from germination. Exact timing varies by genetics, light intensity, nutrition, and overall plant health.

Because autoflowers flower based on age rather than light schedule, there can be slight variation between individual plants—even within the same strain.

Why Choose 45 Day Autoflower Seeds?

45-day autoflowers are chosen primarily for their speed and simplicity, offering several practical advantages:

• Fast turnaround from seed to harvest
• Suitable for short outdoor seasons
• Ideal for discreet or limited-space grows
• No need to adjust light cycles
• Well suited to indoor, greenhouse, or outdoor environments
  
  

They are especially popular with growers looking to maximise annual harvests or those who want reliable results within a fixed timeframe.

Yield Expectations From 45 Day Autoflowers

Yield from fast-flowering autoflowers depends heavily on genetics, environment, and grower experience.

In typical conditions, growers can expect:

• Approximately 2–4 ounces per plant indoors
• Higher results possible under optimised lighting, nutrition, and environmental control

Plants that establish strong root systems and healthy structure during the vegetative phase generally perform better during flowering, even within a shortened lifecycle.

Because these strains prioritise speed, yields are usually more modest than long-cycle photoperiod plants—but highly efficient relative to time invested.

Fast-Flowering Autoflower Genetics

Some autoflowering strains are commonly regarded as fast-finishing due to their compact structure and rapid transition into flower. Classic fast-cycle genetics such as Lowryder-based lines are often referenced for their short lifecycle and reliable performance, particularly in smaller grow spaces.

As with all autoflowers, flowering speed should be viewed as a general guideline, not a fixed guarantee, as growing conditions play a significant role in final timelines.

Growing Tips for 45 Day Autoflowers

To get the most from fast-flowering autoflowers, consistency is key:

Lighting

Autoflowers perform well under 18–20 hours of light per day throughout their lifecycle. There is no need to reduce light hours to trigger flowering.

Containers

Planting directly into the final pot helps avoid transplant stress, which can reduce yield in short-cycle strains.

Nutrition

Autoflowers generally require lighter feeding than photoperiod plants, especially early on. Gradual increases during flowering tend to produce better results than aggressive feeding schedules.

Training

Low-stress training (LST) can help improve light distribution, but heavy pruning or high-stress techniques are usually avoided due to limited recovery time.

Outdoor Timing

Outdoor growers should aim to plant once conditions are stable and daylight hours are increasing, allowing plants to complete their full cycle in favourable weather.

Who Are 45 Day Autoflowers Best Suited For?

45-day autoflower seeds are ideal for growers who:

• Want the fastest possible harvest times
• Need predictable finishing windows
• Have limited grow space
• Prefer low-maintenance cultivation
• Plan multiple harvests per year

They suit both beginners seeking simplicity and experienced growers looking for efficient turnaround.