Do my wooden planter boxes need treatment before planting?

Question

They are cedar and I would like to know how to treat them. They are cedar wood and I need it to be as easy as possible. We have to paint them to match our townhouse in order to keep uniformity for the HOA. I would rather paint them turquoise.
Thank you in advance for your help.

Answer 1

You can line them with thick plastic to prevent any issues with the wood, water and soil. Be sure to poke holes in it for drainage.

https://www.gardeningknowhow.com/garden-how-to/info/treated-wood-for-gardening.htm