Ethan Clarke
Growing vegetables in plastic containers is a convenient way to cultivate your own produce, especially if you have limited space. It is possible to grow almost any vegetable in a plastic container, but some varieties are better suited to container gardening than others. The key to success is providing adequate drainage, choosing the right growing medium, and ensuring your plants receive sufficient water and sunlight. With the right care, you can enjoy a bountiful harvest of fresh vegetables grown in your own plastic container garden.
| Characteristics | Values |
|---|---|
| Container size | Containers should be large enough to prevent vegetables from drying out too quickly. |
| Container type | "Bush type" varieties are recommended over regular types to manage water needs. |
| Container material | Plastic containers are suitable for growing vegetables. Cardboard or newspaper lining can be used to prevent plastic leaching. |
| Container preparation | Containers should be cleaned thoroughly to remove salt residue. Drainage holes are essential to prevent waterlogging. |
| Soil/growing medium | Use a suitable growing medium, such as compost, potting soil, or a mix of both. Consider adding peat moss or perlite for improved aeration. |
| Watering | Water thoroughly and frequently to prevent soil from drying out. Ensure adequate drainage to avoid waterlogging. |
| Sunlight | Most vegetables require full sunlight for at least six hours daily. Leafy vegetables can tolerate less light than fruiting crops. |
| Plant spacing | Space plants a couple of inches apart. Thin seedlings or space transplants to allow outer leaves to touch neighboring plants. |
| Harvesting | Harvest individual leaves when they reach edible size. For continuous harvests of fast-growing crops, plant new seedlings every 3-4 weeks. |
| Stake/support | Provide stakes or trellises for vining plants to prevent stem damage. |
| Temperature control | Move plants indoors during frost to extend the harvest season. |
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What You'll Learn
Container size and plant variety
Container size is an important consideration when growing vegetables. Insufficient space will hinder the growth of your plants and make it difficult to maintain adequate moisture levels. The size of the container will depend on the type of plant you wish to grow, with larger vegetables requiring bigger containers. For example, a cattleman's large stack of empty plastic lick tubs, about 2 feet across and deep, could be used to grow vine crops such as pumpkins, squash, cantaloupe, and watermelon. However, it is important to note that regular varieties of some vegetables can get quite large and may require more frequent watering to meet their water needs. Therefore, it is recommended to look for "miniature" or "bush" type varieties that are better suited for container gardening.
When choosing a container, it is also essential to consider the shape and size of the mature plant. Leave enough space for the outer leaves of mature plants to just touch those of their neighbors. This spacing will depend on the type of plant, with some plants requiring more space than others. For example, fast-growing crops like herbs and leafy greens should be planted a couple of inches apart, and new plantings should be made every 3-4 weeks to ensure a continuous harvest.
In addition to container size, the choice of plant variety is crucial for successful vegetable gardening in plastic containers. Almost any vegetable can be grown in containers, but some varieties are better suited for this purpose. As mentioned earlier, "miniature" or "bush" type varieties are often the best choice, as they are specifically bred for container gardening and have more compact growth habits. These varieties are less likely to outgrow their containers and will require less frequent watering compared to larger varieties.
When selecting plant varieties, it is also important to consider the amount of sunlight available. Most vegetables require full sunlight for at least six hours a day. Leafy vegetables, such as herbs, lettuce, and spinach, can tolerate less light, while fruiting crops like tomatoes, peppers, and cucumbers require more sunlight. Additionally, consider choosing varieties that mature their crops gradually to provide a continuous harvest over a long season. "Cut and come again" crops, such as mesclun salad mixes, spinach, Swiss chard, and arugula, can be cut every few days and will provide a bountiful harvest throughout the growing season.
Another factor to consider when selecting plant varieties is the growth habit of the vegetables. Some crops, such as vining plants, will require support structures like stakes or trellises to prevent them from toppling over and causing stem damage. By providing the necessary support, you can encourage upward growth and optimize space in your plastic containers. Additionally, look for varieties that are specifically bred for container growing, such as certain sweet corn hybrids, which have been developed to thrive in confined spaces.
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Container preparation
Firstly, select an appropriate container size. The container should be large enough to accommodate the mature size of the vegetable plant. Consider the variety of vegetable you plan to grow and choose a container that will provide sufficient space for its root system. For example, regular varieties of some vegetables may become too large, so consider "bush type" or "miniature" varieties that are better suited for container gardening.
Next, prepare the container by cleaning it thoroughly. Remove any salt residue or other contaminants that may be present, especially if the container is reused. This step is important to prevent any potential harm to your plants. Ensure the container has drainage holes at the bottom. Drilling or punching holes in the bottom of the container will allow excess water to drain, preventing waterlogging and root rot.
If you have concerns about plastic contamination or leaching of chemicals, consider lining the plastic container with cardboard or thick layers of newspaper. This creates a barrier between the plastic and the soil. However, be aware that roots may eventually penetrate this barrier. Alternatively, you can explore non-plastic options such as ceramic or terra cotta pots, or products like Smart Pots, which are fibre-based, flexible, and lightweight.
When choosing a growing medium, there are a few options to consider. Compost is a good choice, but be mindful of its composition. Depending on its salt content, you may need to mix it with potting soil to avoid excess salts burning the roots of your plants. Contact the compost provider to inquire about soil analysis reports, specifically regarding soluble salt content. If using composted cattle manure, mix it with potting soil, limiting manure to about 10% of the mix to avoid high nitrogen levels, which can affect fruiting. You can also consider using field or garden soil, but be cautious of potential herbicide residue. Mixing in peat moss or perlite can improve aeration and drainage.
Before planting your seeds or transplants, ensure your container is positioned in an area that receives adequate sunlight. Most vegetables require full sunlight for at least six hours daily, although leafy vegetables can tolerate less light. Watering is also critical, especially as soil in containers tends to dry quickly. Water thoroughly and frequently, ensuring the soil is moist to a depth of at least 1/4 inch. Adding compost to the potting mix before planting will provide some extra nutrients to boost the initial growth of your vegetables.
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Choosing a growing medium
Firstly, ensure the growing medium is suitable for the specific vegetables you plan to cultivate. Different crops have unique nutritional requirements. For example, fruiting crops like tomatoes, peppers, cucumbers, and eggplants typically require more sunlight and nutrients than leafy greens.
Next, consider using a mix of compost and potting soil. Compost provides essential nutrients, but its composition can vary. City compost, for instance, often consists of leaves/grass clippings, branches, manure, and biodegradable oils. While compost is a great option, it may be high in salts, so mixing it with potting soil is recommended. Contact your compost supplier to request a soil analysis report, especially regarding soluble salt content. If the salt levels are too high, increase the proportion of potting soil in your mix.
Another option is to use composted cattle manure, but this should be limited to about 10% of your mix, as it tends to be high in soluble salts and nitrogen. Excess nitrogen can result in vine growth at the expense of fruit production, particularly in cucurbits like cucumbers and pumpkins.
Field or garden soil can also be used, but caution must be exercised due to the potential presence of herbicide residue. To improve aeration and drainage, mix in about 50% peat moss or perlite. Additionally, consider using a product like Smart Pots, which are fiber-based, flexible, lightweight, and inexpensive.
Remember, the key to successful container gardening is ensuring your growing medium is well-drained and provides the necessary nutrients for your vegetables. By selecting the right mix of compost, potting soil, and other amendments, you can create an optimal environment for your plants to thrive.
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Watering and fertilising
When watering, it is important to water thoroughly, ensuring that the water penetrates the soil to a depth of at least 1/4 of an inch. Frequent watering is essential, especially for containers, as the soil tends to dry out quickly. Watering regularly also helps to wash salts from the soil, keeping it cool and preventing root injury. For larger plants with extensive root systems, it is crucial to ensure that water reaches all parts of the soil to avoid dry patches, which can hinder root development.
The choice of growing medium is vital for successful fertilisation. Compost is a popular option, providing essential nutrients for plant growth. However, compost composition varies, and some may be high in salts, so it is advisable to mix compost with potting soil to mitigate this issue. Contact the compost supplier to obtain a soil analysis report, paying close attention to the soluble salt content. If levels are too high, mixing with potting soil is recommended. Similarly, composted cattle manure should be used sparingly (around 10%) due to its high salt and nitrogen content, which can impact fruit production.
To enhance fertilisation, consider mixing in peat moss or perlite with the growing medium. This amendment improves aeration and drainage, creating an optimal environment for root growth. Additionally, adding compost to the potting mix before planting provides a good nutritional start for your plants. For continuous harvest crops, frequent fertiliser applications may be necessary to replenish nutrients in the soil. Slow-release fertilisers or liquid fertilisers applied every few weeks can help maintain nutrient levels.
While plastic containers are a viable option for growing vegetables, some concerns have been raised about potential plastic contamination and the impact on taste. However, the risk is considered low, and the benefits of fresh, pesticide-free produce outweigh any potential drawbacks. If contamination is a worry, consider lining the plastic containers with cardboard or thick layers of newspaper to act as a barrier. Overall, with proper watering and fertilising techniques, plastic containers can successfully support the growth of a variety of vegetables.
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Harvesting
When harvesting anything except root crops, it is advisable to use pruners, scissors, or a knife to cut what you need. Pulling on leaves or fruits can damage the plant and may even uproot it from the container. Harvest leafy greens such as kale, mustard, lettuce, and spinach regularly, and reseed as needed. For continuous harvests of fast-growing crops like herbs (cilantro, basil) and greens (lettuce, arugula), make new plantings every three to four weeks.
Some vegetables, like tomatoes, peppers, eggplants, and zucchini, will need to be supported with stakes or trellises to prevent stem damage as they grow and become top-heavy. You can extend the harvest season of tender vegetables by bringing them indoors when there is a risk of frost. Some crops may even be carried through the winter if they receive adequate light.
The type of container you use can also impact the harvesting process. While plastic containers are generally safe, they may not be suitable for all plants due to their limited size. Choose containers with the right volume and depth to support your plants once they are fully grown. For example, larger plants like tomatoes, peppers, and eggplants require a container with a minimum volume of five gallons and a depth of 12 to 18 inches.
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Frequently asked questions
Almost any vegetable can be grown in plastic containers, but "miniature" or "bush" varieties are best suited. Some examples include leafy greens such as spinach, Swiss chard, and arugula, as well as herbs like basil and cilantro.
The container should be large enough so that the soil doesn't dry out too quickly and the plant has room to grow. Make sure the container has drainage holes to prevent waterlogged soil, which can damage roots. Consider using food-grade plastic buckets or bins, or line your container with cardboard or newspaper to prevent potential plastic leaching.
Most vegetables require at least six hours of full sunlight per day. Water frequently and thoroughly, ensuring that the soil is well-drained. Add compost or fertiliser to the potting mix to provide nutrients. For continuous harvests, plant fast-growing crops every 3-4 weeks.
Provide stakes or trellises for vining plants to prevent stem damage.
Some people are concerned about plastic leaching chemicals into the plants, especially BPA and BPS. However, there is no solid evidence that plants can uptake these chemicals through their root systems. If you are concerned, consider using alternative containers like ceramic, terra cotta, or fibre-based "Smart Pots".
