Is there any lumber that should not be used in a raised bed??

I have lots of fresh pittosporum limbs that I would love to use to raise the vegetable bed but will it start sprouting in a year or two??

Thanks so much.

There are several types of treated lumber. That should not be used in raised beds, or with any soil that touches food.

 Pressure-treated lumber and those with creosote should be avoided.
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 As for branches,  members of the willow family are generally bad for sprouting and there are many others as well.

According to Herbiguide.com, pittosporum seedlings are very aggressive after fires or other disturbance. They document that a tree stump of a felled tree will sprout new shoots, which I interpret to be different than if the stump was completely removed and relocated to, say, a raised bed or hugelkulture. I would venture to guess that if your limbs weren't in a seed producing stage of their life cycle, and the the biomass is disconnected from the root system, the raised bed will probably be okay.

Dale's mention of willow wood reminds me of a podcast from Paul where he talks about wanting to keep willow out of the hugelkulture bed. I can't remember which podcast though. To add on to omitting pressure treated wood, I would say any engineered/milled wood should stay out of a raised bed, bed frames notwithstanding. I believe Sepp Holzer writes about using fresh wood over long time dried or rotted wood.

Good luck on your project. May I ask what your short term watering plan is?