Complete Guide on How Deep to Plant Cannabis Seed

by DigiRocket Technologies on Jan 22, 2024

Complete Guide on How Deep to Plant Cannabis Seed

Planting and germinating cannabis seeds mark the initial and crucial steps in cultivating a healthy and flourishing plant. The depth at which you place the seeds ultimately determines the plant's overall well-being and growth.

Now, why does depth matter so much? So, the depth at which you plant your cannabis seeds significantly influences their germination and growth. Planting the seeds at the right depth ensures they receive the right amount of water, nutrients, and oxygen needed for strong and healthy development.

In this comprehensive guide, we'll break down all the details of planting cannabis seeds. From the essential tools you'll need to step-by-step instructions, we've got everything covered.

Step-by-Step Guide: Planting and Germinating Cannabis Seeds

Step 1 - Germinating the Seeds

While germinating the seeds there are a few things that you must do:

Inspecting Your Seeds Before Planting 

It's important to carefully examine your cannabis seeds before starting the planting process. Better-quality plants are usually grown from darker-colored seeds, which also have a better possibility of successfully germinating. On the other hand, white or light green seeds have a lower chance of germinating.  According to Sensi Seeds, a seed will typically germinate 90–100% of the time.

Creating the Ideal Cannabis Seed Germination Environment

The surroundings have a major impact on the success of germination. To improve the probability of a successful germination, follow to the suggested methods: 

  • Maintain an optimal temperature between 22°C and 25°C (71–77°F).
  • Keep the growing environment moist, avoiding excessive wetness.
  • Maintain relative humidity between 70% and 90%.
  • Use fluorescent lighting (Cool White code 33) for seed growth.
  • Minimize seed handling.
  • For hydroponic/rockwool plugs, maintain a pH value between 5.8 and 6.2.

The duration of germination may vary, ranging from a few days to a week, depending upon the technique used, like soaking seeds in water, placing them in a moist paper towel, or planting them directly into the ground.

Step 2 - Planting the Seeds

Planting cannabis seeds involves two primary factors: soil and water. Here's a detailed breakdown of the planting process:

Determining the Optimal Depth for Planting Germinated Cannabis Seeds

The cannabis seeds' ability to develop successfully depends on how deeply you plant them. Sow the seed between 0.5 and 1.5 inches (1.3 and 3.8 centimeters) deep, according to standard recommendations. This ensures the seed receives enough moisture for germination without being too deep, hindering its ability to break through the soil surface.

Planting holes should be about one-third the height of the pot for those growing cannabis in it. For example,  go for a planting hole of the depth of 4 inches (10 centimeters) in a 12-inch (30.5-centimeter) pot.

Step 3 - Caring for the Seeds

With your seeds successfully planted, proper care is crucial for their continued growth. Here's a breakdown of key care steps:

1. Maintaining Moisture

It's important to maintain the moisture level of the soil after planting without overwatering. Water the soil gently once a day or two until the seedlings appear. After they grow, switch to deeper, less frequent watering sessions.

2. Frequency of Watering

Watering should be done according to your grow setup and climate. Try to water your plants every four to seven days on average. Be flexible, however,  keep an eye on any factors in your space that can affect how much moisture your plants require.

3. Temperature Control

Maintain a constant room temperature, keep the plant at a temperature of 68 to 77 degrees Fahrenheit during the vegetative stage. A temperature range of 65 to 85 degrees Fahrenheit is good if your plants start to blossom. Maintaining a constant temperature promotes strong growth. 

4. Ventilation Essentials

Make sure the growth area is properly ventilated. Cannabis plants require a sufficient amount of airflow to survive. Use fans or other ventilation techniques to ensure that there is a steady flow of fresh air, creating an atmosphere that is ideal for the growth of plants.


By diligently inspecting seeds, creating an optimal germination environment, and planting at the right depth, you can ensure a strong and healthy plant growth. If you're still exploring cannabis, be sure to check our resource on the highest yielding indoor cannabis seeds.  


  1. How do I plant a germinated seed?

Plant the germinated seed in loose, well-drained soil, following the recommended depth.

  1. Can you put seeds straight into the soil indoors?

Yes, seeds can be planted directly into indoor soil or other growing mediums.

  1. Should you water seeds right after planting?

Yes, water the soil lightly after planting, ensuring it remains moist but not waterlogged.

  1. How many seeds do you put in one hole?

It is generally recommended to plant one seed per hole to prevent overcrowding.