Thank you for you answere!
I'm planning on grinding a herb bouquet, dried whole plants, even roots into very small pieces that still keep the plants character. It is Chamomile, Dandelion, Clivers, Burdock, Nettle, Great Plantain, Meadowsweet, Rose Hip (berry), Yarrow and Red Clover. My intent is to keep it during winter and feed it to horses little by little. I have dried whole plants in papersacks and they smell lovely.
I understand mortel, food processor, coffe mill, as well as bigger mills for grain or even laboratories are used. I would be greatful for more detailed advices including specific type, trademarks or grain methods that are successful. Since it is for some horses the amount is substantial.