I apologize if this is not a good answer but after I research more I will answer the question in a explained way
because they had nothing else to use.
Medicine Pipes.
yes!
they use plants for making medicine and they use it for decorations. (not all the time)
The Yanomami people used plants from the rain forest to make the medicine.
When you are sick you have to have the plants medicine to cure you otherwise you will suffer from the sickness that you have.
Plants And Plant Extracts
Since they were farmers, they grew potatoes and corn. They used nature (animals and plants) to make weapons, clothes, transportation, food, medicine, and tools. The Iroquois were religious people, so they respected Mother Earth and all of her creations. They were very creative.
Chinese sometimes use plants and animal parts
William N. Fenton has written: 'The False Faces of the Iroquois' 'William Fenton' -- subject(s): Historiography, Social life and customs, Iroquois Indians, Rites and ceremonies, Folklore 'An outline of Seneca ceremonies at Coldspring longhouse' -- subject(s): Seneca Indians 'Contacts between Iroquois herbalism and colonial medicine' -- subject(s): Medicine, Traditional medicine, Indians of North America, Iroquois Indians 'The Iroquois eagle dance' -- subject(s): Eagle dance, Iroquois Indians
The Iroquois would use plants to..... build houses( longhouses &wigwams), eat plants (for food), to clothes out of grass/and other plants, and ect.! Hope I helped you a little bit! :)
plants, such as trees, can produce oxygen(air), also trees can be chopped down and used for wood to make houses and much more!