Picking wildflowers while walking through nature, digging up plants for the garden or stocking up on provisions? It is not forbidden outside of nature reserves, but there are so many exceptions that plants do look most beautiful in their natural environment!
Digging up plants completely, for example to plant a perennial in your own garden, is generally prohibited. Whether you are allowed to pick individual flowers, berries or mushrooms depends on the quantity, for one thing: A hand bunch, i.e. a bunch of flowers that can be held by one hand, is allowed. The same applies to fruit, berries, nuts or mushrooms: small quantities for personal use are allowed. In general, only things that are not protected by nature may be collected or picked. Especially in the case of flowers, there are many species that look very similar.