I built a retaining wall using 4x4 Sunwood Pressure treated lumber. The
wall is 3 feet high and I secured by driving 1/2 rebar through holes I
drilled with a larger auger and drill and driving the rebar at least 2' feet
into the ground. Its been 10 years and I cannot see one instance of any
movement or structural degradation. The wood itself looks great and even
still has the red color
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I'm going to be building a raised garden bed out of pressure-treated
landscaping timbers, and I wanted to know how long re-bar would last in
this material.

First off, this is for a flower garden only, not a veggie garden, so
anything leaching from the PT lumber will be of no health consequences.

Secondly, this will be in a relatively hidden part of the yard, so it
don't need to look incredibly purdy. For this reason, staining from
the metal vs. wood is also of no consequence.

I'm planning on predrilling holes through the timbers, then pounding
re-bar through and into the ground about two additional feet. So my
question is two-fold:

1. How long would this re-bar last before it rusted so badly from the
PT chemicals that it lost it's holding abilities?
2. Is there a better material I could use similar (and as cheaply) to
re-bar that wouldn't rust so badly?

The bed will be three timbers high, so roughly 6 - 9 inches in total
height.

TIA.