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.
As a man's testosterone declines, so does his estrogen. Testosterone levels in men fall much more slowly than estrogen levels in women, who often suffer hot flashes and other disruptive menopausal symptoms when their ovaries stop making estrogen, sometime around age 51.