The toxins in found in the genus Rhododendron are toxic. These chemicals are found largely in the leaves and in the nectar and pollen and can be quite a problem for animals of all kinds, including us. Poisoning from azalea honey is even possible.

However, the process of composting will break those toxins down, turning them into harmless chemical 'bits and pieces', if you will. No problem at all with putting that compost in your veggie garden. The physical, biological, and chemical activities involved in the composting process are very powerful, indeed. In goes the 'bad stuff' and out comes good stuff!