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Can Marijuana Plants Grown in Clear Plastic Cups?

Growing marijuana can be an exciting and interesting experience. Whether you are growing weed for personal use, for medical purposes or just for fun, you will find that there are many ways to grow cannabis and to profit from your growing operation. And of course first time cannabis growers have a lot of questions on their mind about growing weed and one of the most common is asking whether marijuana plants can be grown in clear plastic cups.

Cannabis can actually be grown almost anywhere. You will be surprised as to how creative growers can be and how efficiently they can hide their growing operation. You will find marijuana in cups, pitchers, vats, pans, pots, pails and even grown in bathtubs. So the answer to this question is a resounding yes. However there are some precautions about growing weed in just about any container, like a clear plastic cup.

Why growers use clear plastic cups?

  • Clear plastic cups let you monitor the germination and the growth of your seedlings. Because these cups are clear, you can easily peek and monitor its growth and make any changes to prepare for your plant’s growth as well.
  • Clear plastic cups can be easily perforated. Simply punch a hole at the bottom of your cup and you now have a small pot to use.
  • Clear plastic cups are disposable and cheap. Because plastic cups are cheap and disposable, you can plant a seed in a cup. You don’t have to use a pot for each seed or seeds and this is a good thing if you are simply growing seeds to determine their gender.
  • Clear plastic cups are easy to use and easy to dispose. Many growers use plastic cups to grow not just cannabis but also different kinds of plants. After a young plant has developed from the seed, you can now transplant it to a larger container.

Some disadvantages of using plastic cups

Plastic cups should only be used until the first few leaves of your plants have grown and you have determined the gender of your plants. After which you must remove it from the plastic cup and transfer it to a large pot. A condition called “root lock” can occur when a plant’s roots are contained in a very small space like a party cup. Roots may become inefficient to hold the plant or even get nutrients from the soil because it has been bound in a small space. Root lock is also detrimental to a plant’s ability to grow and affect its yield. Root lock can stress a plant and could be very damaging especially when you are growing autoflowering plants.

Some plastic cups may also contain dangerous chemicals that can affect the growth and development of plants. If you must grow your plant in small container cups, select cups that are free from dangerous chemicals and any toxins.

Transplanting from a plastic cup to a large pot

Growers recommend growing marijuana from a large pot to prevent transplanting which can stress plants a lot. However, if you have used a clear plastic cup to grow seedlings then you must transfer these as soon as you have healthy and strong young plants.

  1. Check your plant for good health before transplanting. You may proceed to transplantation when you see that your plant has nice green leaves, strong large branches, thick roots and a healthy disposition. Do not transplant when you see leaf discoloration, withered leaves, falling leaves, broken branches or stems and only a very few roots. Yes, you can also monitor your plant’s roots because you have used a clear cup. Also check for good growth. Your plants should have at least new leaves every day. Place your candidate aside.
  2. Prepare your new pot. Use a large pot which is according to the mature size of your cannabis strain. Refer to breeder’s information about the height and size of the strain that you are trying to grow.
  3. Place soil or growing medium inside the pot. Fill the pot halfway with soil and make a large hole in the middle. Water this soil and let water completely soak the soil and run off from the hole at the bottom of the pot.
  4. Let the wet soil dry a bit. You need damp soil to transplant your plant in. After the soil has dried a little set it aside and work on removing your plant from the plastic cup.
  5. Gently massage the side of the cup to release the plant with its soil. Usually party cups have ribbed sides so that it’s easy to hold the cup. This could affect the ability of your plant to slide out of the plastic cup.
  6. Once the cup has loosened, hold the soil and the plant in one hand and slowly invert the cup. The soil and plant will gently fall on your hands. Turn the plant right side up and place it gently inside the new pot. Do not touch the roots of your plant.
  7. Cover the transplanted plant with soil or growing medium. Water this plant until you see water running off from the hole at the bottom of the pot. Add more soil to hold the plant down but keep its main branch uncovered. Do not overfill the pot and let the soil touch the leaves.
  8. Place the transplanted plant in a quiet and bright spot inside your grow room or outdoors. Let this plant rest and recuperate. It would take time for your plant to adjust so monitor its growth as often as possible.

Transplanted plants survive well if they are allowed to rest and recuperate after the process. In transplanting autoflowering plants this can take a toll on your plant’s growth and yield therefore it is not advised to plant autos in a small clear plastic cups on day one. Better plant it in a large pot and let it grow from seed to harvest time.

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