Redwood deck lumber chemically treated?

[farmerlon]

I recently salvaged some Redwood deck lumber from my parents home. After 25 to 30 years, the board ends had started to rot out (where the boards had been nailed), but a lot of that lumber is still useable.
I am thinking about using some of those boards to edge my garden area and raised beds.
Does anyone know if Redwood boards were ever chemically treated? Or, would it be pretty safe to assume those boards were untreated, since Redwood is supposed to be naturally rot-resistant?

[SOB]

To steal my answer from your own words...

Redwood is supposed to be naturally rot-resistant

[sweet thunder]

I doubt it's been treated, and even if it were, any chemicals have probably leached out over the last couple of decades!

[farmerlon]

Thanks for the responses... your comments mirror what I had thought.
I just figured I would pose the question, in case someone here knew something about Redwood (possibly being chemically treated) that I had never heard before.
Garden on!