Non Biodegradable Pot Liners

I have some large terracotta pots. I don't like to plant directly into them because it makes the plant hard to remove. So I've started to use plastic pots to plant them and use the terracotta plants to hold and hide them.

The problem is that the standard sizes don't fit well, I'm losing a considerable amount of room for root development.

I know that there are flexible pot liners, but these seem to be all biodegradable, which will defeat the object for me.

Is there a better solution?

 

Hi @Howard Stone I'm just wondering if you could use DPM? It's meant to last and is quite pliable, just a thought.

 

Flexible plastic like damp proof course or compost bags would line the pot alright, I'm just not sure how easy it'll be to remove a plant. Has anyone tried it?

 

Apart from cacti, I've never found it difficult to remove plants from clay pots.
Cacti and some succulents do attach themselves to the pot, but not noticed the problem with other plants.

 

I had a big problem removing box topiary, I really don’t want to go through it again!

But it looks as though not all plants attach themselves to the terracotta.