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.
A low sperm count could also possibly cause watery semen in some men, due to the same reason: not enough sperm in the semen. Several factors can affect a man's sperm count. If the testicles are kept at too high of a temperature, for instance, sperm might not develop properly.