Application guide
Pebbles for Planters and Flower Beds
In a planter, pebbles serve two separate purposes and the material for each is different. At the bottom, coarse stone creates drainage void. At the top, a fine decorative layer holds moisture in the soil, keeps it from washing out during watering and finishes the pot visually.
For indoor planters, a polished or tumbled top dressing in a fine grade almost always looks better than large stone, which overwhelms the scale of the pot.

Suitable pebble types
- Polished pebbles
- White pebbles
- Coloured pebbles
- Drainage pebbles
Recommended sizes
5–20 mm for top dressing; 20–40 mm for the drainage layer at the base.
Recommended finish
Polished or tumbled indoors; natural finish for outdoor beds.
Colour selection
White and black read best against green foliage indoors. Use one colour per planter group.
Quantity considerations
A 20–25 mm top dressing is enough. Depth beyond that hides the pot rather than finishing it.
Estimate your requirement
Installation tips
- 1Place coarse stone over the drainage holes before adding potting mix.
- 2Leave 25–30 mm below the rim for the decorative layer.
- 3Keep top dressing slightly clear of plant stems.
Maintenance
- Lift and rinse the top dressing when it collects soil residue.
- Check drainage holes have not blocked.
Recommended products for planters and flower beds
- Polished PebblesTumbled and polished stones with a deeper colour and a subtle sheen — the choice for display areas and interiors.
- White PebblesBright, high-contrast stone that makes planting and paving read sharper — the most requested decorative colour.
- Coloured PebblesA broad palette of decorative stone for interiors, retail display, gifting and craft work.
- Drainage PebblesFree-draining stone for planters, French drains, soakaways and terrace build-ups.
Topic hub
Part of our garden and landscaping pebbles guide
Stone types, sizes and depths for garden beds, paths, planters and terrace gardens.
Read the garden and landscaping pebbles hub →Products in this topic
Where it is used
Planters and flower beds — frequently asked questions
Planning a planters and flower beds project?
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