What's the best home remedy for asthma?

Not great one: There is no great home remedy for asthma although in Germany homeopathic and herbal products are commonly used though not been scientifically proven. In a pinch when there is no other option, drinking a few cups of coffee may provide transient relief. Consider seeing an allergist since allergen avoidance & allergy shots may be very helpful in providing long-term solution to asthma