No reason why not. Cherry is harmless and narcissus only poisonous if you actually eat the bulbs.

Thank you for your reply. What if I want to plant some chrysanthemums and sedum in the same bed as the vegetables?

Same answer - old cottage gardens in this country used to mix flowers and veg all the time. In fact during WW2 I can remember parks having their flower beds edged with beetroot - useful and decorative at the same time. Carrots make a pretty edging too, if you have fine sandy soil.I can't think of anything that actually poisons the soil. Stop worrying and enjoy!