Photoperiod

What Are Photoperiod Cannabis Seeds?

Photoperiod cannabis seeds are a unique type of cannabis seed that thrives on light cycle management to grow and flower. Unlike autoflowering strains, which bloom automatically based on age, photoperiod plants depend on specific light-to-dark ratios to transition through their life stages. This makes them the go-to choice for growers who want more control over their cultivation process.

Here’s how it works: during the vegetative stage, photoperiod plants require long hours of light—usually 16 to 18 hours a day—to focus on growing roots, leaves, and branches. They’ll stay in this stage indefinitely as long as they’re exposed to extended light periods. When you’re ready for them to start flowering, you simply reduce the light exposure to a 12-hour light and 12-hour dark cycle. This change mimics the natural shift from summer to autumn and signals the plant to begin producing buds.

Photoperiod seeds are prized for their versatility and potential. Growers can extend the vegetative stage to cultivate larger plants with more flowering sites, resulting in bigger yields. These plants also tend to produce higher levels of THC and other cannabinoids compared to autoflowers, making them a favorite among those seeking potent strains. Additionally, photoperiod plants are ideal for cloning and training techniques like topping or low-stress training, allowing growers to experiment with advanced cultivation methods.

While photoperiod seeds require more attention—especially when it comes to managing light cycles—they offer unmatched rewards in terms of yield size, potency, and customization. Whether you’re growing indoors with artificial lights or outdoors relying on natural sunlight, photoperiod cannabis seeds give you the ability to control every aspect of your grow and tailor it to your goals. For growers who enjoy being hands-on and maximizing their harvest potential, photoperiod seeds are an excellent choice.

How Quickly Do Photoperiod Seeds Grow?

Photoperiod cannabis seeds offer a flexible timeline for growth, but their overall speed depends on how you manage their light cycles and the specific strain you choose. Typically, the full growing process—from seed to harvest—takes anywhere from 10 to 16 weeks indoors, while outdoor grows can stretch to 20 or 21 weeks due to seasonal light changes.

The life cycle of photoperiod plants is divided into distinct stages:

Vegetative Stage: This phase can last as little as 4-6 weeks or be extended indefinitely, depending on how long you keep the plant under a light schedule of 16-18 hours of light per day. Extending this stage allows the plant to grow larger and develop more flowering sites, which can lead to higher yields.

Flowering Stage: Once the light schedule shifts to 12 hours of light and 12 hours of darkness, the plant transitions into flowering. Most photoperiod strains flower for about 8-9 weeks, though some indica-dominant strains can finish in as little as 7 weeks, while sativa-dominant strains may take up to 14 weeks.

The flexibility of photoperiod seeds means you have control over how quickly they grow. You can speed up the process by shortening the vegetative stage or take your time to maximize plant size and yield. This adaptability is one reason why photoperiod seeds are a favorite among growers looking for high yields and potent harvests.

Tips For Growing Photoperiod Seeds

Growing photoperiod cannabis seeds successfully requires a bit of planning and attention to detail. These plants thrive when given the right environment and care, and here are some tips to help you get the most out of your grow:

Master the Light Cycles: Photoperiod plants rely on specific light schedules to grow and flower. During the vegetative stage, keep them under 18 hours of light and 6 hours of darkness daily. When you’re ready to induce flowering, switch to a 12/12 light cycle. Consistency is key—any interruptions during the dark period can confuse the plants and delay flowering.

Choose Your Grow Space Wisely: If you’re growing indoors, make sure your grow room or tent is completely lightproof to avoid any accidental light leaks during the dark phase. Outdoors, be mindful of nearby artificial lights, like streetlights, which can disrupt the flowering process.

Control Plant Size with Veg Time: The longer you keep your plants in the vegetative stage, the larger they’ll grow. If space is limited, consider shortening this phase. On the flip side, if you have plenty of room, extending veg time can lead to bigger plants with higher yields.

Optimize Nutrients: During the vegetative stage, focus on nutrients high in nitrogen to encourage healthy growth. Once flowering begins, switch to a formula richer in phosphorus and potassium to support bud development.

Experiment with Training Techniques: Photoperiod strains are great for plant training methods like topping, low-stress training (LST), or Screen of Green (SCROG). These techniques help maximize light exposure and improve yields by encouraging even canopy growth.

Monitor for Stress: Stress from inconsistent lighting, overwatering, or nutrient imbalances can cause photoperiod plants to hermaphrodite (develop male flowers), which can ruin your harvest. Keep a close eye on your plants for any signs of stress.

Be Patient: Photoperiod strains take time—expect around 10-16 weeks from seed to harvest indoors. Outdoor grows may take longer depending on your climate and when you start planting. Plan accordingly so your plants finish before cold weather sets in.

What Photoperiod Strains Are Available at Grower's Choice Seeds

• Zoap: This perfectly-balanced hybrid is known for its euphoric and relaxing effects and flowering time of just 55-65 days. Growers are looking for yields of approximately 18-24 ounces per square meter indoors and up to 35 ounces per plant outdoors. 
• White Widow: White Widow is an indica-dominant hybrid with up to 23% THC, celebrated for its resinous buds and ease of cultivation. It flowers in 55-65 days and yields approximately 18 ounces per plant indoors and up to 22 ounces per plant outdoors.
• Dutch Treat: Dutch Treat is an indica-dominant hybrid with 25% THC, known for its sweet, piney aroma and relaxing effects. It flowers in 55-65 days, yielding around 12 ounces per square meter indoors and 4-8 ounces per plant outdoors. 
• Cherry Runtz: Cherry Runtz is a flavorful hybrid with fruity notes and balanced effects. It flowers in 55-65 days, yielding approximately 19 ounces per square meter indoors or up to 19 ounces per plant outdoors. 
• Animal Mints: Animal Mints is a potent hybrid with a minty flavor profile and relaxing effects. It flowers in 55-65 days, with high yields typically exceeding 20 ounces per plant outdoors, though specific indoor yields are not provided.
• Black Runtz: Black Runtz is a balanced hybrid with up to 25% THC, offering fruity, candy-like flavors and calming effects. It flowers in 55-65 days, yielding approximately 18-21 ounces per square meter indoors and up to 35 ounces per plant outdoors.