Alexei Volkov
Plastic pots are a popular choice for plant lovers due to their durability, lightweight nature, flexibility, and strength. They are inexpensive and can be found in a variety of shapes and colours to suit any decor and interior. However, some people are concerned about the safety of using plastic pots for growing plants due to the presence of potentially harmful chemicals like Bisphenol A (BPA). Despite these concerns, most scientists and professional growers believe that growing plants in plastic containers is safe, and plastic pots are widely used in commercial crop production. When using plastic pots, it is important to ensure proper drainage and consider the size of the plant's root system to prevent decay. Additionally, keeping plastic containers out of intense sunlight and opting for light-coloured containers can help reduce the potential for chemical release.
| Characteristics | Values |
|---|---|
| Advantages | Durability, lightweight, flexibility, strength, inexpensive, different shapes and colours, easy to clean, easy to move, suitable for moisture-loving plants |
| Disadvantages | Potential release of harmful chemicals like BPA, especially when heated |
| Considerations | Size of the plant and its root system, drainage hole, distance between pot walls and roots, recycling codes, type of plastic |
| Signs for Repotting | Roots popping through the soil or drainage hole, drooping or yellowing leaves, plant outgrowing the pot |
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What You'll Learn
Plastic pots are safe and inexpensive
Plastic pots are a safe and inexpensive option for growing plants. They are lightweight, flexible, and durable, making them easy to move and clean. Plastic pots are also suitable for almost any type of plant, even orchids, which can be very demanding. The flowers get good ventilation at the bottom, the water flow is correct, and the liquid will not stagnate. The orchids also receive an optimal microclimate inside the box, which will make them beautiful and durable.
Plastic pots are usually made of inert material and are often recycled. They are available in a wide range of shapes, colours, and designs to suit any decor and interior. The low price allows you to change the planter more often when the plant grows or the pot becomes deformed. It is important to consider the size of the plant, especially its root system, when choosing a plastic pot. The distance between the walls of the pot and the roots should be about 2-3 cm for the plant to grow comfortably.
While plastic pots are generally considered safe, some people have concerns about the potential for chemical leaching and the presence of Bisphenol A (BPA). However, manufacturing companies closely monitor the composition of plastic containers to ensure there is no dangerous BPA inside. To further reduce any concerns, gardeners can pay attention to recycling codes, keep plastic containers from overheating, and use potting mediums with high organic material content.
Overall, plastic pots are a safe and cost-effective option for growing plants, offering advantages such as durability, flexibility, and a wide range of design options.
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Choose the right size pot for your plant
Plastic pots are a great choice for growing plants, especially moisture-loving plants, as they are durable, lightweight, flexible, and inexpensive. They come in a variety of shapes, colours, and designs to suit any decor and can be used for both indoor and outdoor plants. However, it is important to choose the right size pot for your plant to ensure its roots have enough space to grow.
When choosing a plastic pot, the first consideration should be the size of your plant, especially its root system. If you choose a pot that is too large, the roots may receive too much soil and moisture, which can lead to decay. On the other hand, if the pot is too small, the roots will not have enough space to grow, and the plant may become pot-bound. A good rule of thumb is to leave a distance of about 2-3 cm between the walls of the pot and the roots to allow for comfortable growth.
It is also important to monitor your plant for signs that it has outgrown its current pot. If you notice roots popping up through the top of the soil or poking through the drainage hole, it is time to repot. Drooping or yellowing leaves can also indicate that the plant needs more space. Repotting should be done within a few weeks of purchasing the plant, especially during the peak summer growing season, as plants tend to grow faster during this period.
When repotting, it is recommended to loosen the roots gently and prune off any thread-like roots that are extra long, while leaving the thicker roots intact. You can also remove about one-third of the existing potting mix before adding fresh soil to the new pot. It is best to choose a new pot that is only 1 to 2 inches larger in diameter to avoid overwhelming the plant with too much new soil and space.
Additionally, when choosing a plastic pot, consider the safety concerns surrounding plastics. While most commercial growers use plastic in some form, there are concerns about the use of plastics containing Bisphenol A (BPA). To address this, opt for plastic pots made from HDPE plastic, which is considered safe and has essentially no risk of leaching toxins. Keep your plastic pots out of intense sunlight and choose light-coloured containers to prevent overheating, as this can potentially release harmful chemicals.
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Drainage and air pruning
Drainage and aeration are important considerations when growing plants in plastic pots. Plastic pots are not breathable, so it is important to create holes in the bottom of the pot to allow excess water to drain out. The number and size of the holes will depend on the plant and the potting media. If you are using a plastic pot with an absorbent media, it will retain water. Using a more porous or less absorbent media will allow the water to disperse more readily.
It is also important to consider the size of the plant and its root system when choosing a plastic pot. If the pot is too large, the roots may receive too much moisture, which can lead to decay. If the pot is too small, the roots will not have enough space to grow.
Air pruning pots are a type of plastic pot that helps to improve drainage and aeration. These pots have small openings in the sides and bottom that allow air to circulate and water to drain. When the roots reach these openings, they die off, and new roots develop, creating a stronger, more dispersed root structure. This allows the plant to absorb more nutrients and water, leading to improved plant growth.
Some air pruning pots have simple lines of holes along the edges, while others are made of fabric or plastic grids surrounded by perforated sheets. These pots can be effective for air pruning roots, but they may not be practical for all types of potting material. It is also important to note that adding holes to the sides of plastic pots can increase the risk of the plant drying out too quickly.
Overall, when growing plants in plastic pots, it is important to consider the drainage and aeration needs of the specific plant and to choose a pot and potting media that will provide adequate drainage and aeration while also allowing the roots to grow and thrive.
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Potting mediums and soil health
Plastic pots are a great option for growing plants, especially due to their durability, lightweight nature, flexibility, strength, and inexpensive cost. However, some people are concerned about the safety of plastics and their potential impact on soil health. To ensure soil health when using plastic pots, here are some detailed tips and instructions to follow:
Firstly, it is important to choose the right potting medium. Opt for a medium that has a high amount of organic material. Organic material keeps the soil soft and healthy, allowing plants to thrive. Additionally, organic material can act as a filtering system, catching and collecting any chemicals that may be present, reducing their impact on the roots. This is especially important if you have concerns about the safety of plastics.
When selecting a plastic pot, consider choosing a light-coloured container. Dark-coloured plastics can absorb more heat, potentially increasing the release of chemicals. By choosing light-coloured pots and keeping them out of intense sunlight, you can help reduce the risk of chemical leaching into the soil.
Another factor to consider is the type of plastic used. Choose plastics that are made of inert and recycled materials. Look for plastics that are closely monitored to ensure they do not contain harmful substances like Bisphenol A (BPA). The safest type of plastic to use in gardening is considered to be HDPE (#2), which has essentially no risk of leaching toxins into the soil or water.
While plastic pots are convenient and inexpensive, it is recommended not to keep your plants in them indefinitely. Over time, your plant may outgrow its plastic pot, and you will need to repot it into a larger container to provide more room for root growth. Signs that your plant needs repotting include roots popping up through the soil or drainage hole, drooping or yellowing leaves, and roots growing in tight circles around the base of the plant.
When repotting, gently remove the plant from its plastic pot and loosen the roots carefully. You can prune any excessively long roots and give the root-bound roots a trim. Then, place the plant in a new pot with fresh soil, ensuring there is adequate space for the roots to grow comfortably.
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Repotting and transplanting
There are several signs that indicate it's time to repot your plant:
- Roots are growing through the drainage hole at the bottom of the planter.
- Roots are pushing the plant up, out of the planter.
- The plant is growing slower than normal (different from winter dormancy).
- The plant dries out more quickly than usual, requiring more frequent waterings.
- The aboveground parts of the plant take up more than three times the pot space.
- The plant's leaves are drooping or starting to yellow, even though you're watering it properly.
When repotting, choose a new planter that is only 1-2 inches larger in diameter for tabletop plants and no more than 4 inches larger for floor plants. If you're repotting a very small plant, your new planter might only need to be an inch larger. If you transplant your plant into a much larger pot, it will be surrounded by a lot of excess soil. When that soil gets wet and there aren't enough roots to absorb the water, it can cause root rot.
To repot your plant, first remove it from its current pot by holding it gently by the stems or leaves and tapping the bottom of the pot until the plant slides out. You may need to gently pull or tug on the base of the stems to help it along. Next, loosen the plant's roots gently with your hands and prune off any threadlike roots that are extra long, leaving the thicker roots at the base. Remove about one-third or more of the old potting mix surrounding the plant, as it likely no longer contains the necessary nutrients. If you are repotting a rootbound plant back into the same pot or one of the same size, you can root prune your plant by cutting off up to about one-third of the roots at the bottom.
Pour a layer of fresh potting soil into the new planter and pack it down, removing any air pockets. If your new planter doesn’t have a drainage hole, layer the bottom with lava rocks or similar materials before adding the potting mix. The goal is to create crevices for the extra water to pool into, away from the plant’s roots. Place your plant in the new planter, holding it gently so that the base of the stem is about 1/4"-1/2" below the top of the pot. Add or remove soil from underneath the plant to adjust its height, then add more potting soil around the plant while you hold it in place. Be sure not to pack too much soil into the planter, as you want the roots to breathe.
Finally, water your plant well. Newly transplanted plants are under a bit of stress, and they need ample water right away. Water your plant slowly and gently, allowing it to soak in. Water again until the pot feels heavy and water runs out of the drainage holes. You can let the pot sit in the saucer for around 30 minutes to see if it will soak up any of the drained water, then dump any excess. Note that a freshly repotted plant does not need to be fed fertilizer.
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Frequently asked questions
Most scientists and professional growers believe that growing plants in plastic is safe. However, some people are concerned about the presence of Bisphenol A (BPA) in plastics. Potentially harmful chemicals like BPA are most significantly released when plastic becomes heated, so keeping your plastic containers out of intense sunlight can help reduce the potential for chemical release.
Plastic pots are lightweight, flexible, durable, and inexpensive. They are suitable for almost any type of plant, even orchids, and can be used for growing seedlings. They are also aesthetically pleasing, with modern models available in a variety of colours and designs to suit any decor and interior.
Some growers believe that plastic may be harmful to the soil and roots of the plant. Plastic pots may also be unstable for large plants, and they have a shelf life, requiring replacement every 3 years.
If you see roots popping up through the top of the soil or poking through the drainage hole, it's a sign that the plant needs more space and should be repotting. Drooping or yellowing leaves can also indicate that the plant has outgrown its current pot.
