How to Fill Tall Planters

Tall planters in black and gray in back yard

Tall planters make an eye-catching statement whether indoors or out. However, they have a unique consideration compared to other planters. Because they're deeper, you have more space to fill.

Filling them entirely with potting soil can make them heavy, especially after watering. Moreover, your soil will sink into the bottom of the planter over time.

You also run the risk of a perched water table that won't dry out quickly. That can lead to root rot, especially with more shallow roots that can't access lower levels of the planter to consume excess water.

So, using filler material with tall indoor or outdoor planters makes sense. That will save money on potting soil and keep the planter lighter, making moving easier.

What to Avoid As Fillers

Before diving into what works best, knowing which materials to steer clear of is crucial.

First, avoid using materials that can degrade quickly, such as certain organic matters. These materials can compact over time, leading to poor drainage and root rot. They can also make the planter heavy as they compact in the bottom of the plant pot. Remember to check for drainage holes to help offset the issue.

Second, materials that are too heavy can make it difficult for the planter to move and put stress on its structure.

Avoid using materials that can react with the planter or soil, which can change the pH and harm your plants.

Using Lightweight Fillers in Tall Planters

The chief advantage of lightweight fillers is that they retain mobility. So, lightweight fillers are the best approach to shift your planters to change your design.

Here's a look at the pros and cons of lightweight fillers:

Pros:

  • Improved Drainage: Materials like perlite, vermiculite, and expanded clay pellets enhance soil drainage, preventing waterlogged roots.
  • Ease of Movement: Lightweight fillers make the planter more manageable, offering flexibility in changing your space's layout.
  • Root Support: These fillers can support growing roots without compacting over time.

Cons:

  • Drying Out Quickly: Some lightweight materials may cause the soil to dry out faster, requiring more frequent watering.
  • Less Stability: Planters filled with lightweight materials may be less stable in windy areas. That's especially important with a larger plant as your focal point. It can make your tall planter top-heavy and more likely to tip over.

Lighter Materials for Fillers

With lightweight fillers, the options are endless. You can even recycle materials to avoid adding expense to tall pots.

You can use any of these options when filling your planter:

  • Inverted pots
  • Plastic containers like soda, water, or milk jugs
  • Packing material
  • Styrofoam
  • Internal shelf

Using Heavyweight Fillers in Tall Planters

As mentioned, stability is the most likely reason for using heavier fillers in your planter. A heavier base will keep tall outdoor planters anchored, especially with plants like dwarf trees or shrubs. You'll have fewer concerns with indoor planters where wind isn't an issue.

Pros:

  • Stability: Heavy materials like gravel, rocks, or sand keep planters steady, perfect for tall plants that could sway in the wind.
  • Heat Retention: Some heavy materials can retain heat, benefiting certain plants.

Cons:

  • Reduced Mobility: The main drawback of using heavyweight fillers is the significant increase in weight. A filled large planter becomes more difficult if you change your design or move plants to a more shady location in the heat.
  • Poor Drainage: Heavy materials can impede drainage without proper layering, leading to waterlogged soil.

Heavier Materials for Fillers

Second, you use heavier materials if the planter needs support. For example, you could place a tree in a tall planter where it can become top-heavy. The downside is that moving the planter becomes more taxing.

Here, these materials can work:

  • Stones
  • Bricks
  • Cinder
  • Logs

The Art of Layering Fillers in Tall Planters

You can quickly fill your tall planter by dropping materials into its bottom, adding soil, and planting. But here's something you might want to consider.

Layering materials in tall planters is a clever gardening hack. It can save you time, effort, and resources, all while ensuring your plants thrive. Here's how to do it:

Bottom Layer: Drainage and Stability

This layer's primary role is to facilitate drainage, preventing water from pooling at the bottom of the planter. It also adds weight to the planter's base, enhancing stability, particularly in tall and top-heavy arrangements.

First, cover the planter's bottom with a non-porous material like landscape fabric. You can also use a coffee filter to prevent soil from washing into the drainage layer.

Next, add your chosen material to a depth of 2-4 inches, depending on the planter's size.

Material Options:

  • Gravel
  • Broken terracotta pieces
  • Recycled plastic bottles or nursery pots
  • Rocks

Middle Layer: Transition and Support

This layer provides a buffer between the heavy bottom layer and the topsoil, promoting healthy root growth. Lighter than the bottom layer, it helps reduce the planter's overall weight without sacrificing stability. This layer also continues to support good drainage and aeration.

Fill the middle section of the planter, leaving enough room for the topsoil and plants. This is typically the largest layer and should be rich in organic matter to support plant growth.

Material Options:

  • Lightweight potting soil
  • Compost mixed with perlite or vermiculite
  • Expanded clay pellets

Top Layer: Nutrient-rich Soil and Plants

This layer is where your plants will live. It should be nutrient-rich and well-draining to provide the best environment for plant roots.

First, add a generous amount of high-quality potting soil or soil blend. Leave a few inches at the top for easy watering and to prevent overflow.

Then, plant your chosen plants as you normally would, ensuring they're at the correct depth and have room to grow.

Material Options:

  • High-quality potting mix
  • Topsoil mixed with organic compost

Tips for Success Filling Tall Planters

Here are some valuable tips when filling your tall planters:

  • Consider the Weight: When choosing materials for each layer, consider the overall weight of the planter. Use more lightweight materials if you plan to move it frequently.
  • Water Wisely: Layering can affect how water moves through the planter. Monitor moisture levels closely, especially after planting, and adjust your watering routine as needed.
  • Refresh Layers Annually: The layers may mix or compact over time, affecting drainage and plant health. Consider refreshing the layers or topsoil annually to maintain plant health.

Count on Root & Vessel for All Your Decorative Planters

Filling tall planters requires thoughtful consideration of the balance between aesthetics, plant health, and functionality. Choose safe fillers and materials to create a beautiful display that improves any space.

Root & Vessel has self-watering planters, which add convenience to our tall planters. The planters are a mix of resin and stone for durability, even in harsh weather.

You can select from four colors and sizes, each with a satisfaction guarantee.