I definitely would not use that type of product as part of a vegetable garden. We used a product on our wood raised beds a product called Eco Wood Treatment, but I'm assuming it will not give you the same look you desire with the bleaching oil. You might also consider stone or paver raised beds, or toughs or other large planter containers that I'm sure would look lovely and blend nicely into your landscape.
Since you don't want pressure treated lumber near your growing food either, you'll need a wood that is naturally decay resistant. I know cedar or cypress work well in outside construction but not sure if they're great in direct contact with soil. I'd find a wood that is good in that situation then use a second wood outside of that with your bleaching oil to keep it away by one layer from your growing soil. I realize, another layer is another expense but you're growing food, not flowers so be careful. Read the label of the bleaching oil - there may well be warnings about using near food source. I don't want anything with Petroleum Distillates near my food.
|Cabot Bleaching Oil/ Weathering Stain|
It is unusual to use Cabot Bleaching Oil for a fence and even more unusual to use it for wood in contact with the ground. It will age to a pale silver gray that will tend to become discolored close to the ground.
The stuff must be pretty bad because when my neighbor was applying it to their fence it gave me a terrible headache. But I really want the raised beds to match the fence which will only be a few feet away and I'm hoping by matching I won't draw the ire of my HOA. To construct the frames I might use thin cedar fence boards or maybe something thicker. So, will I be poisoning my family if I apply the bleaching oil to the outside of my raised bed frames?