How to Build Self Watering Tubs

Don’t worry about watering with these self wicking containers that make gardening so much easier.

Gardening enthusiasts are always looking for ways to make their plants thrive and simplify their routine maintenance. One effective solution to address both of these issues is by creating self-watering containers. These innovative containers not only save time and effort spent on daily watering but also provide a consistent supply of moisture to the plants, promoting healthy growth.

Self-watering containers, also known as sub-irrigated planters (SIPs), are designed with a built-in reservoir at the bottom that holds water, which then wicks upwards towards the plant roots through a soilless potting mix. This process ensures well-hydrated plants without the risk of overwatering or waterlogged soil. In this article, we will delve into how to build your own self-watering containers using readily available materials such as storage totes, coffee cans, and landscape fabric.

This do-it-yourself (DIY) project is an opportunity for both novice and experienced gardeners to enhance their gardening skills, while ensuring their plants receive optimal hydration. Follow along as we guide you through the steps needed to create self-watering containers perfect for potting your favorite flowers, herbs, or vegetables.

Why Use Self-Watering Containers

Benefits for Plants

Self-watering containers provide a consistent level of moisture directly to the roots of plants, promoting plant health and increased yield, particularly for vegetables. These containers reduce the chance of over-watering or under-watering, leading to stronger root systems and overall healthier plants.

Ideal for Vacation

If you’re a frequent traveler or often forget to water your plants, self-watering containers come to your rescue. These containers can hold a few days’ worth of water, ensuring that your plants receive the proper hydration even while you’re away. This eliminates the need for a plant sitter or costly automated watering systems.

Suitable for Patios, Decks, and Driveways

Not only are self-watering planters an effective gardening solution, but they also make for an attractive addition to patios, decks, and driveways. They come in a variety of styles, sizes, and materials to perfectly complement any outdoor space. In addition, these containers offer several benefits:

  • Space-saving: Self-watering containers are excellent options for small spaces where a traditional garden is not feasible.
  • Less strain: Raised containers save your back and knees from the strain of bending down to tend to an in-ground garden.
  • Fewer weeds: By using self-watering containers, you can minimize the occurrence of weeds compared to traditional gardens.
  • Controlled soil conditions: You can create the ideal soil mix for your specific plants, promoting better growth and productivity.

In conclusion, self-watering containers offer an array of advantages for both the plants and the gardener, making them an excellent choice for any outdoor space.

Selecting Materials and Tools

Choosing a Container

When building a DIY self-watering planter, selecting the appropriate container is essential. A popular choice is cedar, as it is both durable and naturally resistant to rot. Other materials, such as treated wood, can also be used to reduce costs. For smaller projects, an 18-gallon storage tote with a lid can work. Ensure the container has proper dimensions and is suitable for your planting needs.

Necessary Tools

To build your self-watering planter effectively, you will need the following tools and materials:

  • Soil: A well-draining, soilless potting mix is recommended.
  • Wick: 3-4 inch wide containers (e.g., yogurt cups) to create a wicking basket.
  • Fill tube: A 24-inch long pipe, one end slanted (CPVC or PVC pipes work well).
  • Cedar planks or other suitable material: Cut to desired dimensions using a saw.
  • Scissors: For cutting landscape fabric and plastic garbage bags.
  • Landscape fabric: To cover the drainage system and separate the soil from the water reservoir.
  • Vinyl tubing: Connects to the fill tube and leads through the drainage hole for easy watering.
  • Drill: For creating holes in the container and inserting the fill tube.

When constructing your self-watering planter, ensure you have all the necessary tools and materials on hand. This will allow you to create a functional and long-lasting planter that is ideal for growing various plants with minimal maintenance.

Assembling the Self-Watering Container

Preparing the Container

Before starting the self-watering container assembly, choose an appropriate 18-gallon storage tote with a lid. Clean the container thoroughly before proceeding to ensure that it is free from any contaminants that may harm the plants.

Creating a Wick System

The wick system is crucial for transporting water from the reservoir to the soil. To make a wicking basket, use a 3-4 inch wide container, such as a small plastic pot:

  1. Drill holes throughout the container to allow water ingress.
  2. Attach a piece of landscape fabric to the bottom of the container. This will act as a cover to keep the soil from falling out and ensure efficient wicking.
  3. Fill the wicking basket with moist soil or a soilless blend.

The wicking basket will sit at the bottom of the main container above the water reservoir.

Installing a Fill Tube

A fill tube allows easy refilling of the water reservoir. Cut a 24-inch pipe at one end in a slanted manner to facilitate water flow. Drill holes in the lid of the storage tote, then insert the fill tube through the hole. Ensure it extends down near the bottom of the tote to make it easy to check the water levels and refill the reservoir when needed.

Adding Drainage and Pipes

In this step, create an aeration shelf supported by two coffee cans, which allows air circulation for the roots and prevents waterlogging:

  1. Cut a piece of perforated drain pipe to fit the width of the container and wrap it in a fabric sleeve.
  2. Place the wrapped pipe at the bottom of the container, running parallel with the wicking basket.
  3. Drill a drainage hole near the top of the aeration shelf so that excess water can escape.
  4. Cover the aeration shelf with a black plastic garbage bag, securing it with zip ties. This prevents soil contact and keeps the water reservoir dark and clean.

Finally, place the wicking basket in the center of the container, ensuring the top of the basket aligns with the top of the drain pipes. Fill the container with soil or a soilless blend, then plant your desired plants. Regularly check and refill the water reservoir through the fill tube using a garden hose or a watering can.

With these steps completed, you now have a functional self-watering container that will efficiently maintain the moisture levels in the soil and promote healthy plant growth.

Planting and Soil Recommendations

Choosing the Right Soil

When building self-watering containers, it’s essential to select the proper soil to ensure optimal plant growth and water retention. A light, fluffy, “soilless” blend is recommended, as it retains moisture without compacting or becoming waterlogged. Potting soil specifically formulated for self-watering planters is also an excellent choice. Here are some key aspects to consider:

  • Select soil with good drainage and aeration properties
  • Opt for soil that retains moisture but doesn’t become waterlogged
  • Consider using a pre-made potting soil specifically designed for self-watering containers

Selecting Plants

When choosing plants for your self-watering container, consider the plant’s water requirements, growth habits, and compatibility with the container size. Some well-suited options for self-watering containers include:

  • Veggies: Tomatoes, peppers, cucumbers, and zucchini are popular choices for self-watering containers, as they enjoy consistent moisture levels and benefit from the system’s capabilities.
  • Herbs: Basil, parsley, cilantro, and other herbs also do well in a self-watering system, as they typically prefer consistent moisture as well.
  • Other plants: Many other plant varieties, such as flowers and ornamental plants, can also thrive in self-watering containers. Just ensure their water requirements align with the container system.

When planting, also remember to mulch the surface to help minimize weed growth and reduce evaporation. Make sure to select plants that are compatible with the size of the container and the amount of sunlight they will receive in their location.

Maintaining the Self-Watering Container

Watering Tips

In self-watering containers, it is crucial to ensure a consistent moisture level near the roots of the plants. To achieve this, use a light, fluffy “soilless” blend that retains moisture without becoming compacted or waterlogged. For better results, invest in potting soil specifically formulated for self-watering planters.

It is also essential to insert a 24-inch pipe with one end slanted as a fill tube in the container. This will allow you to refill the water reservoir easily, without disturbing the plants. Regularly check the water level to ensure there is enough water in the reservoir, refilling as needed.

Managing Weeds and Pests

To prevent weeds and pests in your self-watering container, consider using mulch on the surface of the container. Mulch helps keep weeds at bay and slows down evaporation, maintaining the ideal moisture conditions for your plants. Some popular mulch options include:

  • Bark chips
  • Straw
  • Shredded leaves
  • Cocoa bean hulls

To keep your plants healthy and pest-free, monitor them regularly for signs of infestation or disease. Early detection is crucial to preventing the spread of pests and diseases among your plants. When necessary, use organic pest control methods like neem oil or insecticidal soap to treat existing issues.

Supporting Healthy Plant Growth

To maintain healthy plant growth, follow these tips:

  • Choose appropriate plant species for the container size and growing conditions.
  • Provide adequate sunlight, ensuring plants receive six to eight hours of direct sun per day.
  • Ensure proper air circulation around the plants, helping to prevent the growth of mold and fungal diseases.
  • Prune dead or yellowing foliage regularly to encourage new growth and maintain plant health.

By following these maintenance tips, your self-watering container can support thriving plants with minimal intervention.

Conclusion

In summary, building a self-watering container can significantly save water, encourage healthy plant growth, and provide convenience for gardeners. By understanding the basic principles of self-watering systems and gathering the necessary materials, individuals can create a functional container tailored to their plants’ needs.

When constructing self-watering containers, key elements to consider include the wicking material, the built-in reservoir, and the aeration shelf. These components work together to maintain consistent moisture levels and prevent plants from becoming overwatered or dehydrated.

For a successful project, it is crucial to choose high-quality materials such as cedar, treated wood, or durable plastic. Additionally, exploring options like wicking baskets, landscape fabric, and perforated drain pipes can optimize the effectiveness of the self-watering system.

To customize self-watering containers for various types of plants, consider the specific watering needs and growth patterns of each species. This will ensure an optimal environment for plants to thrive.

By following these guidelines and utilizing the provided resources, anyone can create an efficient and sustainable self-watering container to enhance their gardening experience.