Short answer: tanalised timber is pressure-treated timber for outdoor use. The treatment is driven into the wood under pressure, rather than simply brushed onto the surface, helping to protect it from rot, fungal decay and insect attack. That is why it is widely used for garden planters, fencing and decking in the UK.
Treated vs Tanalised Timber: The Short Answer
Tanalised timber is a type of pressure-treated timber. The timber is placed under pressure so preservative treatment can penetrate deeper than a simple surface coating. This helps protect outdoor timber against rot, decay and insect attack, which is why treated timber is commonly used for garden planters, fencing, decking and other outdoor structures.
People often use the terms treated, pressure-treated and tanalised timber in similar ways. For garden planters, the important point is that the wood is suitable for outdoor use and built with sensible details such as lining, drainage and strong fixings.
Is tanalised timber safe for garden planters?
Modern pressure-treated timber is widely used outdoors. For planters, AM Planters also uses lined interiors to help separate compost from the timber and to reduce compost leakage during normal use.
Why AM Planters uses treated timber
Outdoor planters have to deal with rain, damp compost, frost, sunshine and regular movement. Pressure-treated timber gives a stronger starting point for handmade wooden planters that need to last outside in UK conditions.
If you are choosing a planter for a patio, garden or commercial outdoor space, browse our wooden planters, trellis planters and bespoke wooden planter options.
Tanalised timber FAQs
Is tanalised timber the same as pressure-treated timber?
In everyday UK use, tanalised timber usually means timber that has been pressure treated with preservative for outdoor use.
How long does treated timber last outside?
Lifespan depends on the timber, treatment, weather exposure, drainage and maintenance. For planters, lining and sensible drainage help protect the timber during normal outdoor use.
Can treated timber be used for planters?
Yes. Treated timber is commonly used for garden planters because it is better suited to outdoor conditions than untreated softwood.
Choosing timber planters for outside?
For outdoor planters, pressure-treated timber is the bit that matters: it helps the wood cope with British weather before it ever reaches your garden. AM Planters use pressure-treated wood, lined interiors and strong screw fixings, then deliver planters assembled rather than flat-packed.
- Browse handmade wooden planters for patios, gardens and entrances
- See large wooden planter options if you need bigger planting runs
- Request a bespoke planter quote for awkward spaces or matching sets
Short version: treated timber is useful, but good construction, lining and delivery matter too. No point buying a bargain planter if it gives up before the plants do.
Can you paint tanalised timber?
Yes. Painting tanalised timber not only lifts the look of your garden, it gives the timber an extra layer of protection. Bear in mind that treated timber is not fully waterproof, so it will still expand and contract naturally as moisture levels change through the year.