Lilac is commonly known as bitter clove, so some people think it should be planted behind the house rather than in front of it. Behind the house, I think the pain is not over yet; Behind the house, you can see that the pain has passed. This shows that it is not suitable to grow lilacs in front of and behind the house, which is only the opinion of some people.
In addition, regarding the reasons why pollen smells unhealthy,