I did not know that trick with linseed oil! I started keeping all old plastic planters because they held the moisture so much better than my terra cotta pots.

Linseed oil on the outside? or both in and out?

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Both, inside and outside. Eventually it will soak through to the centre. You could use an oil based paint on the inside if you wanted a funky colour contrast.

I'm not sure if that would leach into the soil mix, to be safe you could do a cover coat of clear varnish.

Thank you!