How to Fill Void Spaces in Planters (2024)

In this article, you’ll learn how to sustainably fill void spaces in your modern planter without wreaking havoc on your budget, wasting soil, or adding additional weight.

We’ll walk through the following 5 ways to fill void spaces in your planters:

  1. Use Plastic Containers
  2. Recycle Wasted Cans
  3. Repurpose Packing Material
  4. Lay Down Rubble
  5. Add an Internal Shelf

When planted properly, greenery in large containers becomes truly stunning and can literally draw patrons into an establishment.

Plus, large containers can be easier to maintain. Because there is more soil volume in a large planter, your plants can develop a more significant root system. And plants with more roots tend to be healthier.

But a gorgeous display in a large planter can quickly become quite a task when you begin trying to fill the substantial amount of empty space in such a planter.

Potting mix is expensive and it’s heavy. Filling a large planter entirely with potting soil is wasteful. After all, the roots of most plants aren’t going to reach all the way to the bottom of the planter. (Keep in mind that shallow-rooted plants generally require 6 inches of soil, while larger plants can require anywhere from 12 to 18 inches.)

Once you know how deep your soil needs to be, you’ll know how much space will be leftover and can choose the most appropriate filler.

How to Fill Void Spaces in Planters (1)

1. Use Plastic Containers

The ultimate goal of each of these tips is to fill void space in your planter. One such filler is the plastic containers that you normally toss into the recycling bin.

Clean the containers thoroughly, add them to the bottom of your planter, and then top with landscape fabric. Now you’re ready to add potting mix.

The landscape fabric serves as a barrier, so soil doesn’t leach down around the filler. Plus, the fabric enables water to drain easily.

This approach is best for non-edible plants, as plastic containers sometimes contain harmful dyes or other chemicals.

2. Recycle Wasted Cans

Soda or coffee cans will also do the trick to fill void spaces in your planters.

Line the bottom of your planter with clean cans. Be sure the can openings are pointed downward, so soil doesn’t fall inside the can. Then, apply some pressure to the cans to remove any air pockets.

Top the cans with landscape fabric. Now you’re ready to add potting mix.

3. Repurpose Packing Material

Packing material like foam packing peanuts can serve as a nice bulky filler for void space in your planter.

Packing peanuts allows easy drainage because of the space between individual peanuts. However, when it comes time to replant, packing peanuts can pose a problem since roots can tend to wrap around each individual peanut. You can minimize this issue by placing landscape fabric between the peanuts and the soil. This way, you'll get the drainage benefit and cut down on the mess when you need to replant.

Don’t have any packing material laying around, but feel like this option would work well for your planter? There are many similar solutions you can find online that use recycled materials.

How to Fill Void Spaces in Planters (2)

4. Lay Down Rubble

Rubble comes in many forms and can be used to fill void spaces in your planters. You can use rocks, pieces of concrete or bricks, gravel, and/or pebbles.

The benefit of using these types of rubble to fill your planter is that they have some weight to them. Weight can help anchor a tall planter that may be prone to tipping over.

5. Add an Interior Shelf

Depending on the type of planter you have purchased or plan to purchase, internal shelves can be fabricated inside larger planters. If this is a solution that you would like to explore, click here to learn more about custom planters.

Learn More

To achieve the best outcome for your large planter, identifying the right filler and soil depth is critical.

At PureModern, we specialize in creating high-quality custom planters fabricated for longevity with elevated design aesthetics. The suggestions in this article are based on past experience with our clients and what we’ve learned over the years as best practices.

If you’d like more information about large planters,get in touch with us. Our experts are available to answer any questions you may have.

How to Fill Void Spaces in Planters (2024)

FAQs

How to Fill Void Spaces in Planters? ›

One of the best things to put at the bottom of a planter for drainage is broken pieces of pot. You can use any unwanted plant pots or chipped crockery for this – simply smash them up into small to medium-sized pieces. Adding a layer of broken pieces of pot like this will prevent compost loss out of the drainage holes.

What is the best thing to put in the bottom of pots for drainage? ›

One of the best things to put at the bottom of a planter for drainage is broken pieces of pot. You can use any unwanted plant pots or chipped crockery for this – simply smash them up into small to medium-sized pieces. Adding a layer of broken pieces of pot like this will prevent compost loss out of the drainage holes.

Is it okay to put Styrofoam in the bottom of a planter? ›

However, because landfills are overfilled with non-biodegradable products, many Styrofoam packing products are now made to dissolve in time. It is not recommended to use Styrofoam peanuts for potted plants now, because they may break down in water and soil, leaving you with sunken-in containers.

How do you block a drain hole in a planter? ›

I always use a mesh to cover drain holes. A long time ago I got packs of round or square plastic mesh at Daiso stores..then I also have a leftover roll of landacape fabric which I just cut to whatever size I need. I know some uses paper towel or coffee filters.. those works too.

How do you fill a void in a planter? ›

Lay Down Rubble. Rubble comes in many forms and can be used to fill void spaces in your planters. You can use rocks, pieces of concrete or bricks, gravel, and/or pebbles. The benefit of using these types of rubble to fill your planter is that they have some weight to them.

How to cheaply fill a large planter? ›

Try these eco-friendly lightweight planter filler options made from everyday household items.
  1. Plastic water and soda bottles.
  2. Unused nursery pots.
  3. Non-dissolvable packing peanuts.
  4. Old pool noodles.
  5. Clean foam take-out containers.
  6. Styrofoam packing materials.
  7. Aluminum soda cans.
  8. Pine Cones.

Should you put rocks in the bottom of a planter? ›

The only reason to put a rock in the bottom of the planter is to cover the drainage hole and keep soil from coming out when you water your plant. Only use one rock per drainage hole. Want more gardening tips? Sign up for our free gardening newsletter for our best-growing tips, troubleshooting hacks, and more!

Can you put cardboard in the bottom of a planter? ›

The answer is yes. You can line the bottom of your raised garden bed with cardboard and newspaper to block out weeds or act as a barrier against rhizomatous, weedy or invasive plants. While some may opt for landscape fabric, cardboard is a more cost-effective option.

Can I put plastic bottles in the bottom of a planter? ›

Make sure bottles are tightly capped, so inside them is only air and the weight of the soil won't make them collapse. Empty water bottles make big pots weigh less, save on soil, prevent soggy roots, and are easy to remove when emptying the pot. Simply hose them off before returning them to your recycling bin.

What can I use as a false bottom in a planter? ›

Styrofoam peanuts do an excellent job. Make sure they're secured within a bag to keep them stable and in place. It also makes your life easier if you decide to repot the plant. You can use styrofoam blocks also.

What to put in the bottom of a planter without drainage holes? ›

Add a layer of drainage material to the bottom of the pot. This could be rocks, pebbles, or broken pottery shards. Choose the Right Plant: Opt for more forgiving plants of occasional overwatering, such as pothos (Epipremnum aureum).

What is best for drainage in pots? ›

Potting mixes usually contain ingredients like coarse sand, vermiculite, and perlite, which help facilitate drainage for potted plants. However, if you'd like to boost the drainage potential of bagged soils, you can mix more of these amendments into your potting mix.

What do you put in the bottom of a large planter for drainage? ›

Empty Plastic Pots

Instead of stacking them in the garden shed, I place one or two upside down in the bottom of a large container. Typically, holes in the bottom of the plastic pots allow moisture to drain through to the main container's drainage holes.

What to cover a drainage hole with? ›

Some popular suggestions include purchasing a rubber stopper, using concrete or a cork sealed with plumber's putty, or filling the hole with silicone sealant. These are all viable methods to seal planter drainage holes.

What do you line the bottom of a planter with? ›

If there are concerns about compost finding their way down to the drainage holes and potentially blocking them, then the likes of newspaper, fabric, paper, or even coffee filters can be used to line the base of the planter and give a protective cover to the holes.

Should I put rocks at the bottom of my planter? ›

The only reason to put a rock in the bottom of the planter is to cover the drainage hole and keep soil from coming out when you water your plant. Only use one rock per drainage hole. Want more gardening tips? Sign up for our free gardening newsletter for our best-growing tips, troubleshooting hacks, and more!

What is the best bottom for a planter box? ›

Depending on your budget and gardening goals, you can line the bottom of your raised garden beds with wide-mesh hardware cloth, stainless steel mesh, landscape fabric, burlap sack, or newspaper/cardboard.

What do you put in the bottom of a raised planter? ›

To put it simply, you should put a layer of organic material at the bottom of your garden bed, which will break down and enrich the soil. This can include compost, or woody material such as logs, dry wood, branches, and leaves.

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