Garden Border Help

I'm not sure if I have this in the right forum but anyway....... :'(
I am re-purposing a bunch of old deck planks to use as a border for my garden beds. My question is what could I use as an attachment to stake the planks in a sturdy position ? :?:

 

without seeing a photo of your planks... I'm guessing you could use some long nails/spikes... or re-bar... or even tent stakes.

 

Rebar is cheap and comes in variety of lengths at home depot. It will out last the wood.

 

Rebar....I'll have to see if that will work thanks

 

Spoken like a true Pacific North Wester

 

these are kind of similar to what I have in straight lengths cut down to 3' sections

wood ( photo / image / picture from Clay_22's Garden )