what fruit takes the longest to grow

Despite investing a large amount in seeds, often only a few seeds become plants
While a large number of seeds do not germinate because they are not of good quality. some seedlings which germinate die after a few days due to damping
Initially the seedling appears to be normal, only it does not grow
Then the seedling starts wilting and dies within a few days. and this is called damping
Some claim that damping is due to fungus in the soil