There are many herbs that can be used for asthma treatment. The following are some of them:
Mullein
Sage
Basil
Cherry tree bark
Cinnamon
Butterbur
Boswellia
Ginseng
Ginger
Garlic
Onion
Radish
Carrot
Lemon
You can use one of them (or mix some of them) to make a tea or drink. For examples:
Basil Tea: Put a handful of basil leaves and two cups of water into a pot, boil it for 10 minutes. Drink throughout the day.
Radish Juice: Put the radish (you can add honey and lemon) into the blender. Mix for 10 minutes, then boil them in the pan. Take one teaspoon in the morning and evening.
Mullein and Sage Tea: Use these two herbs to make a tea.
Ginger Tea: Boil 2 cups of water with 3 slices of ginger, add a teaspoon of brown sugar. Drink two times a day.
Cinnamon, Garlic and Onion Tea: Put 1 stick of cinnamon, 3 cloves of garlic, 1/2 purple onion and 4 cups of water in a pot, keep low heat until the mix reduces to half. You may add honey or sugar to taste. Take one teaspoon per time and two times per day.
Oregano, Cinnamon, Mullein and Lemon Juice: Put a handful of oregano leaves, 1 stick of cinnamon, 1/2 purple onion, a handful of mullein leaves (or a Mullein Leaf Tea bag) and 3 cloves of Garlic in a pot, boil them for 10-15 minutes, add honey and lemon juice. Drink one cup per time, 3 times per day.
You can visit local herbal stores or health supplement stores, and you may find Cinnamon Tea, Butterbur Tea, Mullein Leaf Tea, Odorless Garlic Supplement, Ginseng Tea, or other herbal supplements that can treat asthma.