Maya Ellison
Drainage is essential for potted plants as it prevents water from accumulating at the bottom of the container, which can lead to root rot and eventually kill the plant. If your planter doesn't have drainage holes, you can create them yourself by drilling the base of the planter several times with a drill bit. If you don't want to create drainage holes, you can place a smaller pot with drainage holes inside your planter or use materials such as polystyrene packing peanuts, milk jugs, crushed cans, or plastic bottles to fill the bottom of your planter and improve drainage.
How to put drainage in plastic container planter
| Characteristics | Values |
|---|---|
| Drainage holes | Necessary to prevent water accumulation and root rot |
| Number of holes | One hole is sufficient for planters 6 inches or smaller, larger pots require three or more holes |
| Drilling holes | Use a drill and 1/2-inch to 1-inch drill bits to create holes in the bottom of the planter |
| Protective layer | Coffee filters, newspaper, fabric, paper, or polystyrene packaging can be used to line the base and protect drainage holes |
| Alternative methods | Double potting, using a smaller pot with drainage holes inside the main planter, or placing the planter on a saucer to catch excess water |
| Soil mixture | Well-draining soil mixture is important, potting mixes that are soil-less can improve drainage |
| Soil amendments | Perlite, compost, or other organic matter can be added to the potting mix to enhance drainage |
| Filler materials | Pool noodles, plastic bottles, milk jugs, crushed cans, or polystyrene packing peanuts can be used to fill large planters and improve drainage |
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What You'll Learn
Drilling holes in plastic containers
First, it is important to note that using a nail and hammer to create holes in plastic containers can be challenging and may result in cracked containers. Instead, consider using an electric drill with a sharp drill bit. Before drilling, mark the spots where you want the holes, and if necessary, support the pot with an object inside so that the pot doesn't bend from the hammer strikes. Place the drill bit on the marks, apply light pressure, and drill through the plastic. It is important to wear eye protection during this process to prevent injury from flying plastic shards.
If you are drilling hard, brittle plastic, use a small drill bit and a slow speed to create smooth, tiny holes without cracking or melting the plastic. Draw your desired hole pattern on paper, tape it to the container, and then drill. You can also heat the blunt end of the drill bit to melt the holes through the plastic. This method works well with hard plastic, but be sure to use a slow speed and let the friction between the drill bit and the plastic generate heat.
For soft plastics, a heated push pin or a soldering iron can be used to create holes. If you are using a soldering iron, be aware that it may not work well in colder climates as it can create larger holes. Additionally, if you are creating smaller holes, a heated needle or a butane lighter with a hook screw can be effective.
Once you have created the holes, remember to sand off any rough edges to ensure a smooth finish. You may also want to place coffee filters inside the planter at the bottom before filling it with soil, especially if you have larger holes, to prevent the potting soil from falling out.
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Using a smaller pot with drainage inside
If your planter doesn't have drainage holes, you can always create them yourself by drilling the base of the planter with a masonry drill bit. However, if you'd rather not create drainage holes, you can use a smaller pot with drainage inside your planter.
Find a plastic pot with drainage holes that is slightly smaller than your planter. Pot your plant into the plastic pot, and then set this inside the planter. The plastic pot should be hidden, and it will appear as though your plant is potted directly into the planter. You can then take it out to water, and take advantage of the drainage holes in the plastic pot.
If you want to disguise the fact that it's a pot inside a pot, you can place sphagnum moss, or something similar, around the top. This is the best solution for planters without drainage. You can also use a saucer inside the planter and place the smaller pot on it if there is space. The saucer will catch excess water, which you may need to empty.
If you want to raise the height of the plant so it sits better in the planter, you can add some pebbles or hydro granules at the bottom of the planter. You can also use polystyrene foam, such as packing peanuts or broken polystyrene pieces, to fill the space in the planter and ensure that it will not compress over time.
It is important to note that drainage is essential for potted plants because it prevents water from accumulating at the bottom of the container, which can lead to root rot and eventually suffocate the plant. Proper drainage ensures that soil remains aerated and prevents roots from becoming waterlogged, encouraging deeper and stronger root systems and healthier plants.
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Lining the base with coffee filters
Lining the base of your planter with coffee filters is an effective way to retain your potting mix and prevent soil from leaking out through the drainage holes. This method ensures that your planter remains tidy, and your soil stays in place to support healthy plant growth. Coffee filters are porous, allowing excess water to drain through the holes and preventing the soil from becoming oversaturated, which can lead to root rot. They are also useful in under-watering situations, as the paper filters retain some moisture, acting as a water reserve when your plant needs it.
Coffee filters are a superior alternative to gravel or rocks, as they allow your plant to have as much soil as possible within the pot. Gravel and rocks take up space in the planter, reducing the amount of soil that can be used. Coffee filters are also more effective than gravel at preventing soil from escaping through the drainage holes.
When it is time to transplant your plant, coffee filters can make the process less messy. You can keep the filter on when putting your plant into its new pot, as it will eventually disintegrate.
If you are concerned about using coffee filters because they might turn moldy, you can opt for other porous materials, such as coconut coir or newspaper, which will also allow excess water to drain through.
While it is important to provide drainage for your plants, the best drainage is a combination of a well-draining soil mixture and adequate holes in the bottom of the container. This ensures that water does not accumulate at the bottom of the planter, leading to root rot and eventually suffocating the plant.
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Using polystyrene packing peanuts as filler
Drainage is essential for potted plants to prevent water from accumulating at the bottom of the container, which can lead to root rot and eventually suffocate the plant. Proper drainage also ensures that the soil remains aerated and encourages deeper and stronger root systems.
One way to achieve good drainage is to use polystyrene packing peanuts as filler. Packing peanuts are lightweight, making them easy to use and helping to reduce the weight of the planter. They are also a cost-effective option, as they save money on expensive potting soil.
To use packing peanuts as filler, fill one to two inches of the bottom of an empty pot with the peanuts. Then, lay a barrier of landscaping fabric over the peanuts to protect the soil from sinking down and getting mixed with the peanuts. Finally, fill the pot with soil and add your plants or seeds. The non-biodegradable polystyrene will act as a barrier between the pot base and the soil, allowing drainage to occur if there is too much moisture.
It is important to note that some sources advise against using polystyrene packing peanuts as filler due to potential environmental concerns. Modern styrofoam products are designed to dissolve over time, and they may break down into microplastic particles. Additionally, deep plant roots may grow down into the styrofoam. Therefore, it is recommended to test the packing peanuts by soaking them in water for several days to ensure they do not dissolve before using them in your planters.
Other options for creating drainage in your planters include drilling holes in the bottom of the planter, using a "pot-in-a-pot" method with a smaller draining pot placed inside the main planter, or using alternative fillers such as pool noodles, gravel, or empty plastic bottles.
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Adding perlite to the potting mix
Drainage is essential for potted plants to prevent water from accumulating at the bottom of the container, which can lead to root rot and eventually suffocate the plant. While choosing a planter, always opt for those that already have drainage holes. If your planter doesn't have drainage holes, you can always drill its base several times with a masonry drill bit.
Now, let's talk about adding perlite to the potting mix. Perlite is a naturally occurring, silica-based volcanic rock with high moisture content that expands dramatically when heated. It improves drainage, aeration, and moisture retention in the compost for healthier root growth and less root rot. Its structure retains moisture without waterlogging, making it perfect for potting compost and compost piles. Perlite is also capable of storing nutrients for a short period, which might otherwise wash away immediately.
When adding perlite to your potting mix, a good place to start is to have the perlite make up around 10% to 30% of the total volume of your potting mix. For a seed starting mix, combine equal parts perlite, vermiculite, and peat moss (or coco coir). This soilless mix helps support healthy seedling development and reduces damping-off disease. You can also start seeds in moistened perlite only. For smaller seeds, use finer grades of perlite, and for seeds that need light for germination, use medium-coarse perlite.
Perlite is dusty, so take care to avoid inhaling the dust. If using a whole bag of perlite, pour a couple of litres of water into the bag, seal the top, shake it, and then let it soak for about 15 minutes before using.
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Frequently asked questions
You can add drainage to a plastic planter by drilling holes in the bottom of the planter. To do this, you will need safety gear, including eye protection, face protection, and gloves. You will also need a drill and a 1/2-inch drill bit. Place your planter on a flat surface, preferably on a piece of scrap wood to avoid chipping. Mark where you want the drainage holes to be placed with a pencil, apply a little pressure, and drill through the plastic. Sand off any rough edges when you're done.
If you are using a planter without drainage holes, you can place a smaller planter with drainage holes inside of it. You can also use polystyrene packing peanuts, milk jugs, crushed cans, plastic drink bottles, or pool noodles to fill the bottom of your planter and improve drainage. However, avoid using rocks, gravel, or Styrofoam, as these can impede drainage.
Drainage is essential for potted plants because it prevents water from accumulating at the bottom of the planter, which can lead to root rot and eventually suffocate the plant. Proper drainage ensures that the soil remains aerated and prevents roots from becoming waterlogged, encouraging deeper and stronger root systems and healthier plants.
