Omar Khalid
Plastic containers are a popular option for growing plants, especially for those who live in apartments or have limited access to a garden plot. They are lightweight, durable, flexible, and inexpensive. However, some people are concerned about the potential health risks associated with plastic, such as the leeching of chemicals like BPA into the soil and plants. While there is disagreement over the safety of plastics in plant growth, most commercial growers use plastic in some form, and many scientists and professional growers believe it is safe. To reduce any potential risks, it is recommended to use plastic containers with caution by ensuring proper drainage, avoiding overheating, and using a growing medium with high organic content to act as a filtering system for chemicals. Additionally, consider alternative containers such as clay, ceramic, glass, or fabric.
| Characteristics | Values |
|---|---|
| Advantages | Durability, lightweight, flexibility, strength, inexpensive, ability to hold water, variety of shapes and colors |
| Concerns | Plastic contamination, leeching of toxins, overheating, presence of harmful chemicals like BPA |
| Recommendations | Use cardboard/newspaper lining, provide drainage holes, use light-colored containers, opt for non-plastic alternatives, ensure sufficient water and fertilizer, choose "miniature" or "bush" type varieties for container gardening |
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What You'll Learn
Container size and plant spacing
Container size and spacing are important considerations when growing plants in plastic containers. Firstly, it is crucial to select a container that is large enough to accommodate the mature size of the plant. Choosing a container that is too small will restrict root growth, while a container that is too large can lead to watering issues. The distance between the walls of the pot and the roots should ideally be about 2-3 cm to allow for comfortable growth.
When growing multiple plants in a single container, spacing becomes crucial. For seedlings, it is recommended to thin them out or space them so that the outer leaves of mature plants gently touch those of their neighbours. This spacing allows for adequate airflow and prevents overcrowding. For fast-growing crops like herbs (cilantro, basil) and greens (lettuce, arugula), individual leaves can be harvested as soon as they reach edible size, and new plantings should be made every 3-4 weeks to ensure a continuous supply.
The size of the container also impacts the watering requirements of the plants. Larger containers hold more water and tend to dry out slower, while smaller containers may require more frequent watering to meet the needs of the plants. It is important to ensure that the containers have adequate drainage holes to prevent waterlogging, which can be detrimental to the roots.
When using plastic containers, it is important to consider the potential impact of chemicals such as Bisphenol A (BPA). While recent regulations have addressed this concern, it is advisable to avoid overheating plastic containers, as this can potentially release harmful chemicals. Additionally, using a growing medium with a high amount of organic material can act as a filtering system to reduce the amount of chemicals reaching the roots.
Overall, selecting the appropriate container size and spacing for plants grown in plastic containers is crucial for their healthy development. By providing sufficient space, maintaining proper spacing, and managing watering and drainage, you can create an optimal environment for your plants to thrive.
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Drainage and watering
Container Preparation:
Before planting, ensure your plastic containers are cleaned thoroughly to remove any salt residue. This step is crucial, as salt buildup can harm your plants. Additionally, if you're concerned about plastic leaching chemicals into the soil, consider lining the containers with cardboard, thick layers of newspaper, or burlap sacks. While roots may eventually penetrate these barriers, they can provide a temporary buffer.
Drainage:
Plastic containers are excellent choices for moisture-loving plants, as they hold water well. However, proper drainage is essential. Always make sure your containers have drainage holes at the bottom to prevent waterlogging, which can lead to root rot. If your container doesn't have pre-drilled holes, carefully create some yourself to ensure proper drainage.
Watering:
The frequency of watering depends on the size of your container and the water requirements of your plants. Soil in containers tends to dry quickly, especially in larger pots, so frequent watering is critical. Water thoroughly, ensuring that the water saturates the container, and allow some water to drain out of the holes. This process flushes out dissolved solids and pulls fresh air into the soil.
For larger plants with extensive root systems, you may need to water several times a week to meet their water needs. Be cautious not to overwater, as this can lead to root suffocation and eventual plant death.
Self-Watering Options:
If you're concerned about the challenges of watering, consider self-watering options like self-wicking buckets or tubs with reservoirs at the bottom. These systems can help regulate moisture levels and reduce the need for frequent manual watering. However, some gardeners have expressed concerns about self-wicking containers leading to oversaturation, so standard pots with drainage holes might be a safer option.
Container Colour and Placement:
Choose light-coloured containers whenever possible, as they absorb less heat. Keep your plastic containers out of intense sunlight to prevent overheating, which can increase the potential release of harmful chemicals like BPA. Additionally, consider the placement of your containers to ensure they are not in areas that receive excessive direct sunlight, as this can affect both the container and the plant's health.
In conclusion, growing plants in plastic containers requires a careful balance of drainage and watering. By following these guidelines, you can ensure your plants receive the right amount of moisture while also mitigating potential concerns associated with plastic containers.
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Container material and safety
Plastic containers are a popular choice for growing plants due to their durability, lightweight nature, flexibility, strength, and low price. They are also convenient for those who are less regular with irrigation, as they hold water well. However, some people are concerned about the potential risks of using plastic containers, such as the presence of chemicals like Bisphenol A (BPA) and BPS, which may leech into the soil and be absorbed by plants.
To address these concerns, it is recommended to take the following precautions:
- Choose plastic containers made from inert and recycled materials.
- Avoid placing plastic containers in intense sunlight or high temperatures, as heat can cause the release of potentially harmful chemicals. Opt for light-coloured containers to help keep them cool.
- Use a potting medium with a high amount of organic material. It will act as a filtering system to catch and collect chemicals, preventing them from reaching the roots.
- Consider lining the plastic containers with cardboard, thick layers of newspaper, or burlap sacks to create a barrier between the plastic and the soil.
- Ensure proper drainage by making holes in the bottom of the containers. This will prevent waterlogging and root rot.
- Regularly clean the plastic containers to remove any salt residue.
While there is disagreement over the safety of plastics in growing food, most scientists and professional growers believe that it is safe. However, it is a personal choice, and individuals can decide to use alternative materials such as clay, ceramic, glass, paper, or fabric containers if they prefer.
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Container colour and placement
Plastic containers are a great option for growing plants because they are durable, lightweight, flexible, and inexpensive. They are also versatile and can be used for both indoor and outdoor plants.
When choosing a plastic container, opt for light-coloured containers as they will help keep the temperature down. Dark-coloured containers absorb more heat, which can cause the plastic to release potentially harmful chemicals such as BPA. To further reduce the risk of chemical release, keep your plastic containers out of intense sunlight.
If you are concerned about the potential for chemical leaching into the soil and your plants, you can line your plastic containers with cardboard or thick layers of newspaper. Another option is to use a potting medium that has a high amount of organic material. This will act as a filtering system, catching and collecting chemicals before they reach the roots.
It is important to note that plastic containers should be replaced every 3-5 years, depending on the type of plastic and its durability. This is because plastic can degrade over time, especially when exposed to outdoor elements.
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Container reuse and recycling
Plastic containers are widely used for growing plants, especially in small spaces. However, concerns have been raised about the safety of plastics and their potential impact on health. If you're looking for ways to reuse or recycle your plastic plant containers, here are some ideas:
Reuse
- Use an overturned plastic container as a base to lift a planter above neighbouring plants. This helps to provide extra height and makes watering more accessible.
- Protect your plants from frost by covering them with old nursery containers overnight.
- Use smaller plastic containers as shakers for fertiliser, animal repellent, or other granular materials.
- When mulching, cover your plants with old plastic containers to prevent accidentally burying them or getting the mulch too close to their crowns.
- Use thin, rigid-edged plastic containers as scoops for potting soil.
- Place a plastic container upside down in the bottom of a larger pot to reduce the amount of soil needed and to lighten the weight. You can fill the extra space with bunched-up newspaper to hold moisture and make room for expanding roots.
Recycling
If you prefer to recycle your plastic plant containers, look for local initiatives or programs that accept and recycle plastic plant pots. For example, The Home Depot has a plant pot recycling program in partnership with East Jordan Plastics. They collect and reuse plastic pots from any garden centre to produce 100% recyclable plant trays and containers for greenhouses, nurseries, and garden centres.
When recycling plastic plant containers, pay attention to the recycling codes on the packaging. Look for plastic labelled with #1, #2, #4, or #5, as these are generally considered safer for use around the home and garden.
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Frequently asked questions
Most scientists and professional growers believe that growing plants in plastic containers is safe. However, some people are concerned about the potential for plastic containers to leech toxins into the water and soil. To reduce this risk, you can line the tubs with cardboard or thick layers of newspaper, or use a potting medium with a high amount of organic material, which will act as a filtering system.
Plastic containers are lightweight, durable, flexible, and inexpensive. They are also usually made of inert material and come in a variety of colours and shapes.
Almost any vegetable can be grown successfully in containers, but varieties of the miniature or bush type are best suited for container gardening as they are less likely to cause a watering issue. Leafy vegetables, such as herbs, lettuce, and spinach, can tolerate less light than fruiting crops, such as tomatoes and peppers.
Frequent watering is critical for plants in containers as the soil tends to dry quickly. Water thoroughly when the soil dries to a depth of 1/4 inch, and ensure that the container has drainage holes to prevent root injury.
You can use a variety of growing mediums, such as compost, potting soil, or field or garden soil. However, be careful of herbicide residue and high salt levels, which can burn the roots of your plants. You can also add perlite or peat moss to improve aeration and drainage.
