You can use redwood compost as a soil amendment in most locations. The compost must be fully decomposed to prevent it from tying up the nitrogen in the soil. Redwood compost is a good mulch anywhere in the garden. Oleander leaves can be composted. The toxins in oleanders are not translocated through the soil to vegetable roots.
Plants usually grow luxuriantly in pure compost.
It is preferred however that you mix the compost thoroughly with your native soil. Roots can be lazy and often prefer not to move from pure compost into native soil. I grow my vegetables in 10-gallon containers and ants seem to like the same containers. A. Mixing pesticides and soil for vegetables would be harmful and is not a recommended form of control, says UC master gardener Carol Bowden. Roots would take up chemicals, transferring them right to your vegetables.