Identify at-risk berries in your garden, such as Lily of the Valley, Ivy, Cotoneaster, or Solanum. If you have children, prune these plants after flowering to avoid accidental poisoning.

Also note that treating yourself with plants requires having specific knowledge. So it can be dangerous to do it without a specialist because the confusion of garden plants is the primary cause of poisoning. Indeed, a Comfrey leaf for example which is edible looks a lot like the Purple Foxglove which is dangerous.

Also, you may not know it, but only certain parts of a plant can sometimes be dangerous. Rhubarb for example, whose stem is edible, but the leaf is toxic. The latex of the Euphorbias causes significant skin irritation, and the Schefflera photosensitization.

As we already mentioned in our article Poisonous houseplants, Oleander is very toxic. Castor oil plant, Viburnum, Monkshood, Lily of the valley, Anemone or even Colchicum are all plants or flowers that appear harmless but can be dangerous.
Admire them and enjoy their beauty, but stay vigilant!