Answer: You can use the pine needles in your compost pile and the resulting compost in your veggie garden, but according to University of California, "Oleander leaves are one of the most toxic plants known to humans. However, the leaves must be ingested to be dangerous. Therefore, oleander leaves should not be used in mulch or compost which will be spread in vegetable gardens, or anywhere that animals or children might ingest them." With this caution in mind, I would compost the oleander leaves in a pile of their own with the intention of spreading them around landscape plants rather than in the veggie garden.
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