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cannabis auto flower seeds step 1

Autoflower Beginners Grow Guide

Too hot, too cold, too wet, too dry. These conditions will cause your seeds to fail. There are no old seeds in your order. All seeds are fresh and each batch is germination tested before they are sent out.

Some growers like to soak their seeds overnight before putting in paper towels. I have found that this not necessary.

***It is important to not drown your seeds. If you soak your seeds do so until they sink and no more. This is usually around 12 hours. So overnight is a good rule of thumb but no more. Placing your seeds after a soak directly into your moist soil or medium almost always yields 100% germination (if the soil stays warm enough- at least around 75 degrees).***

These seeds are precious and expensive. I would not risk planting directly into soil or other mediums.

The following steps work for me with the absolute best success rate and they are what my germination tests use.

*I learned this method from Mephisto Genetics and it works great for me.

Germination Tips

Step 1: Take an old video game or DVD case and cut the center disc holder out.

Step 2: Roll off about 16″ of toilet paper or use one-half sheet from a paper towel.

Step 3: Lay the seeds in the middle and fold the paper into a square.

Step 4: Mist the paper until it is completely saturated but not soaked and dripping.

Step 5: Put the paper and seeds into the DVD case.

Step 6: Wrap the DVD case in a cotton T-shirt so the temperature stays stable.

Step 7: Put the DVD case on top of your router or grow tent (if the light is on) so it stays between 75-80 degrees.

Start checking for a tap root in 24 hours. Wait until the taproot is 1/2″ to 3/4″ long before planting with the taproot down.

Tip: If your seed hasn’t opened up in 5 days, lightly sand the surface of the seed with a fingernail emery board and put it back in the DVD case.

Make your hole about the depth of a new pencil’s erasure section including the metal erasure holder. So about 1/2″ to 3/4″ deep. Sprinkle some type of mycorrhizae into the hole. Use tweezers to hold your seed and gently push the taproot into the base of your soil. Very gently cover the hole with fine soil or coco. Use a sprayer to mist the top of the soil until it’s moist about 1″ deep.


Autoflower seedlings don’t need much of anything. They don’t need lots of water and they don’t need nutrients. The seeds are packed with enough nutrition to last the seedling into its 2nd set of true leaves.

If you are planting in soil, you most likely have enough nutrients that come with the soil to last you into flowering. If you are planting in coco/perlite I recommend researching your grow at the Coco for Cannabis site.

Many experienced autoflower growers start their seedlings directly into their final containers. This is because autoflowers will flower early (resulting in lower yields) if the roots become stressed (i.e. rootbound or transplant shock).

However, I have found that no root distress happens if the seedlings are transplanted when the 3rd set of true leaves appear.

Therefore, I highly recommend planting seedlings in red 16 oz Solo cups. Just take a stack of them and drill holes in the bottom for drainage.

These cups help the beginner grower to not overwater during the seedling stage. Overwatering, especially in soil, will cause stunting and reduced yields.


Use a Solo cup as a measuring device by digging out a hole in your final container and making sure the solo cup fits in the hole.

Remove your measuring Solo cup.

Mist the hole with water so it’s moist and then dust with mycorrhizae the bottom and the sides of the hole.

Soak your plant with water so the soil stays together while transplanting.

Spread your fingers so your seedling slips between them and turn your Solo cup upside down so your hand catches the top of the soil. You may need to give the cup a squeeze or tap to help it out.

Put the empty cup aside and support the rooted soil gently while you flip the seedling over and place it in your pre-made hole.

From the edges of your final pot push the soil towards the seedling while you support the seedling soil. This helps the mycorrhizae to stay in place so it touches your seedling soil.

Gently pack the soil. Gently water in the transplant with about a 1/2 cup of water.

You can put a sandwich bag over the cup until the sprout emerges to keep it from drying out!

Container Sizes

This depends on the size of plant you want. In soil, smaller pots (say 1 gallon) produce smaller plants. 3-gallon pots produce larger plants. In coco/perlite you can go with a smaller pot but you will be watering much more often. The same goes for soil at the flowering stage.


I have found many commercial soils, including Fox Farms, are too high in nitrogen for autoflowers. The sweet spot for soil, for me, has been a lightmix by Roots Organic. Specifically, Roots Organic 707. Call around and see if you can find this soil. If it’s not available in your area, ask for a lightmix that is light on nutrients. Especially nitrogen.

By the way, for massive flowers, super-fast growth and protection from over-watering, check out growing in Coco/Perlite.


I can’t recommend Greenleaf Nutrients line of organic fertilizers enough. Start with MegaCrop and you won’t be disappointed. (Visit Greenleaf Nutrients and see if you can get a free sample…)


I’m loving Meiju Quantum Boards purchased from Alibaba. 240 watts per 2’x4′ growing area. 3500 Kelvin.

When the seedlings are very young, I dim them way down using the Io adjustment screw (yours may come with a dimmer). Even then, I keep the light around 18″ from the tops.

I ramp up the wattage as the plants grow.

During flowering, I am at full blast but still 18″ from the tops.

I run them 24/7. That’s the beauty of AutoFlowers! If you want to save some on your electric bill you can run them 18 hours on and 6 off but don’t go any lower than that.

Grobo Support Center

Here is a video of Bjorn and Stephen discussing what you should be looking for in a cannabis seed:

Why start from seed?

Seeds have taproot where clones do not, therefore they will create a better root system than a clone. You also have more variety with selecting seeds from a seed bank with multiple breeders. Clones are not readily available for most areas and are often more limited in strains, which make seeds an optimal choice for growing.

A clone will save you some time if you put it right into flower, but you won’t have the advantage of starting in a Grobo with max light spectrum. This means it may have large spaces between internodes, preventing you from maximizing your Grobo yield.

What does a good seed look like?

Mature Seed – Dark

Immature Seed – Light green, Beige

Always avoid cracked seeds. See pictures of good and bad seeds in this article: What is seed germination? How to pick a seed.

Different seed types

Regular seeds or bag seeds – 50/50 chance of male/female.

Feminized seeds – Breeders ensure the seed will germinate a female plant, which is what we want!

Auto-flowering – Not dependent on specific lighting. Grobo has their auto recipes on a 18 hour of light, 6 hours of darkness schedule.

What seed should I pick!

A feminized Indica seed is optimal to begin in a Grobo. We recommend sticking to a photoperiod dependent seed.

Check out our recommended seed companies:

*To see more about availability based on location, click HERE

Feminized Indica seeds that are photoperiod dependent are awesome in a Grobo. Try out these strains:

  • Strawberry Kush:ILGM (Feminized, Indica dominant)
  • Chocolate Cream:Seedsman (Feminized, Indica dominant)
  • OG Kush:ILGM (Feminized, mostly Indica)
  • Grand Daddy Purple:ILGM (Feminized, Indica dominant)

Learn more about auto-flower and photoperiod seeds:

Have a seed without a recipe in the Grobo database?

We update recipes quarterly and have over 3000 currently!

I’m ready to grow!

Step 1: Add Plant to Start Growing

Step 2: Pick a Recipe

Note: We have generic recipes available if you can’t find your specific breeder and strain. Just search “generic” and the recipes will come up!

Happy Growing!

Still have questions? Please see HERE for how to contact us.

How to Grow Autoflower Hemp Seeds

There are a number of benefits to growing autoflower hemp crops. In an increasingly competitive industry where efficiency is directly tied to profitability, you need every edge you can get. To this end, being able to control your harvest windows and dictate the speed of your crops are great advantages. Autoflowering CBD strains from High Grade Hemp Seed allow you to do just this.

Not only do autoflowering plants give you precision control over your hemp harvests, but they also allow you to grow multiple crops in a year. As such, you can stagger your hemp flower harvests, so you can keep a revenue stream coming in all year. Finally, several autoflower harvests per year allow you to sell your flowers for better prices during non-peak seasons.

For those farmers curious about autoflower grow techniques, High Grade Hemp Seed put together this definitive autoflower grow guide.

What are Autoflower Hemp Strains?

Let’s start with the basics: What is autoflower hemp and how is it different from other types of hemp strains?

Traditionally, all cannabis sativa plants are known as “photoperiodic” plant species. This means, hemp experiences different growth phases as dictated by periods of available sunlight. The amount of sunlight changes throughout the year, from spring planting until autumn harvest. Importantly, hemp plants transition from vegetative growth to flowering phase when there is an even 12 hours of light and 12 hours of darkness.

As the name implies, autoflower plants automatically grow flowers. Importantly, they don’t require a change in the light or the season. Autoflower hemp strains are the descendants of cannabis plants grown in Central Asia, Eastern Europe, and Russia. In these cold countries, the cannabis plants had to learn to grow quickly to make the most of short growing seasons. They shed their reliance on the light cycle, allowing them to grow and flower in record time.

Today’s farmers can now use seeds from autoflowering plants to grow precision CBD hemp crops.

Why Choose Autoflower Hemp Seeds?

Before we jump into our tips for growing autoflower plants, let’s look at why you might want to consider choosing autoflower seeds instead of photoperiod seeds.

Speedy Growing Cycle

Most hemp strains require over 100 days (sometimes up to 120 days) to complete a grow cycle. Autoflower strains, on the other hand, are speed demons when it comes to growing. Most strains reach maturation in 7 to 10 weeks, allowing farmers to grow multiple harvests per year in warmer climates. This fast growth rate also makes autoflower strains a great option for farmers who live in colder climates with short outdoor growing seasons.

High Resiliency

The great ancestors of today’s autoflower hemp seeds had to survive in some of the world’s toughest climates, which makes autoflowers some of the most resilient hemp strains around. As such, if you live in an area where cold weather and frost come early, autoflowers genetics are likely a great choice.

Resistance to Pests

Pests and insect infestations are a threat to any crop, but autoflowers grow so quickly, insects often don’t have enough time to do the plants much harm. This makes autoflower crops more pest-resistant than most other hemp strains.

Cannabinoid and Terpene Production

In the past, autoflower plants have been criticized for producing lower-than-average amounts of cannabinoids and terpenes. These days, however, hemp seed companies like High Grade Hemp Seed have been hard at work breeding autoflower strains that boost CBD yields and provide tantalizing terpene profiles your customers want.

How to Grow Autoflowers in Soil

Growing autoflower hemp seeds in soil isn’t so different from planting other strains of hemp. The primary difference is you have more options on when to plant autoflower seeds.

Step 1: Revise Your Operation

Growing autoflower hemp is a different ballgame than traditional photoperiodic cultivation. The speed at which autoflower plants reach maturation affects nearly every facet of a farm operation.

There are several factors you must consider if you plan on growing autoflower hemp:

  • Plant size: Because autoflower plants mature so quickly, they do not grow nearly as large as photoperiod hemp strains.
  • Plant count: To keep your harvests profitable, you must grow more plants to compensate for the smaller size of autoflower plants.
  • Harvest schedule: Whether you are staggering multiple harvests in a season, or just growing a quick crop, harvest times will be much different than seen with traditional hemp crops.
  • Labor: If you are staggering crops, be sure you have available labor on hand during atypical harvest times.

Step 2: Schedule Your Planting

The beauty of autoflower hemp seeds is that they can grow throughout most of the year as long as they don’t experience frost or too much rain. That gives you a lot more flexibility in when to plant. In some parts of the country, planting can start in early spring all the way through to late fall.

Figure out your planting goals: Do you want to focus only on autoflowers and cycle as many harvests as you can? Or do you want to get an autoflower harvest at the beginning and end of the year around your other, longer-growing hemp strains?

Step 3: Germinate Your Plants in a Greenhouse

At High Grade, we often recommend germinating your seeds in a greenhouse infrastructure to give your seeds the best chance for survival. Autoflower plants don’t have as much time to recover after they are transplanted outdoors, so you may want to experiment with greenhouse propagation techniques. If you decide to germinate your seeds in a greenhouse, it’s a good idea to give your new seedlings a few weeks to grow in the greenhouse before transplanting.

Because autoflower plants are smaller than normal, you must also plan for a larger plant count during germination. This means you will need more propagation materials and greenhouse space if you are growing autoflower crops.

Step 4: Prepare Your Soil

Your robust autoflower hemp seeds don’t need as much nutrition as other hemp strains, but they still appreciate a little nourishment. Test your soil before planting and double-check that your soil doesn’t contain high levels of sulfur, potassium sulfate, or rock phosphate.

Step 5: Keep Your Soil Well-Drained

Hemp plants, including autoflowers, grow best in loose, well-drained soil. Adjust watering to your particular climate. Autoflowers do well with surface drip irrigation, subsurface drip irrigation, pivot irrigation, and flood irrigation.

Step 6: Harvest Your Plants Sequentially

Your autoflower hemp plants will be ready for harvest between 7 to 10 weeks. Consider harvesting the colas on the tops of the plants first in order to give the lower buds a little more time to mature before harvesting them.

Step 7: Germinate Your Next Crop

To create the fastest cycle between harvests, begin germinating your next crop of non-autoflower hemp seeds in your greenhouse as you are harvesting your autoflower crop in the field. Once your harvest is complete, you should have a whole new batch of germinated hemp plants ready for another round of growing and harvesting.

Growing Autoflowers Indoors

Thinking of growing autoflower seeds indoors? You’ll need to set up a well-designed grow space. Make sure to set up proper lighting and irrigation and that you have the ability (and the right equipment) to maintain the right temperature and humidity levels.

Step 1: Plant Seeds in a Single Pot to Avoid Replanting

Autoflowers grow so quickly that they don’t have the time to recover from a big stressor like replanting from one pot to another. Instead, plant your seeds and grow them to maturation in a single pot. If you want to attempt to create a strong canopy in your grow space, plant the seeds in smaller pots so you can keep your plants together.

Step 2: Prepare Your Soil Properly

Autoflower hemp plants prefer light and airy soil. They don’t need the same amount of nutrients as other strains of hemp. Be careful about using pre-made soil mixes with too many nutrients. Plant your seeds in only lightly fertilized soil.

Step 3: Limit Watering

Be careful about overwatering your autoflower hemp plants. As we mentioned, autoflowers don’t recover well from major stresses like a deluge of water. Give the soil enough time to dry between waterings. A lighter watering schedule will also help you prevent mold.

Step 4: Determine Your Light Scheme

The beauty of autoflower hemp plants is that you don’t have to commit to a rigid light schedule like you would with photoperiod plants. However, you still need to give your autoflowers plenty of nurturing light to help them grow strong.

There is a lot of debate on how much light to give industrial hemp plants. Farmers who want the highest resin yields and have a little more money to invest upfront may want to use a 24-hour light cycle. Farmers who want to save on energy costs can still get good results using an 18/6 schedule, which refers to 18 hours of light and six hours of darkness.

Step 5: Control for Airflow and Humidity

Autoflower hemp plants do best in moderately warm temperatures, so try to keep your grow space at a cozy 68 to 78 degrees Fahrenheit. Good airflow is also an important component of keeping your plants happy and healthy, so use a ventilator to keep humidity low.

Step 6: Harvest Sequentially

When your indoor autoflower hemp plants are ready for harvest, take the colas and the buds from the top first in order to give the lower buds a little more time to mature. This will help you get even more resin from your harvest.

Step 7: Rinse and Repeat

You know the drill by now. If you have space in your grow room, consider germinating your next crop of seeds while harvesting your current crop. Take advantage of the fast-growing speeds of your autoflowers to achieve multiple harvests in a year.

Talk to High Grade Hemp Seed about Autoflower Strains

To give your autoflower hemp crop the best chance for success, look for the seeds with proven genetics. At High Grade Hemp Seed, we are proud to offer our feminized autoflower seeds, which are known for uniform growth, as well as great cannabinoid and terpene production.

High Grade Hemp Seed takes great pride in helping our clients achieve success in the hemp industry. This guide on how to grow autoflower hemp only scratches the surface of this complex topic. If you want more tips for growing autoflower, contact us today.