Cut your bought or home grown spring onions about 3cm (1in) above the root. Use the leaves in cooking and add the stem/roots to a glass with clean water to rehydrate roots. Change water daily & keep in a well lit position such as a windowsill or kitchen bench. Watch green leaves regrow.
Basically, a hard thwack to the balls would do the trick.   Also, a man could stop producing sperm because â¦of a hormone imbalance, especially age related.     Men never stop making spermatazoa after the onset of puberty, as long as their testicles remain intact.
Amberc - it takes a man about 2.5 months to produce a new sperm cell from new but of course he has sperms cells at diferent stages of development in his testes all the time as it is a continuous process. However, I think you are talking about how long you should leave between ejaculations - which is a different thing.