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.
The relationship of these symptoms to decreased testosterone levels is still controversial. Unlike menopause in women, when hormone production stops completely, testosterone decline in men is a slower process. The testes, unlike the ovaries, do not run out of the substance it needs to make testosterone. A healthy man may be able to make sperm well into his 80s or later. However, as a result of disease, subtle changes in the function of the testes may occur as early as age 45 to 50 and more dramatically after the age of 70 in some men.