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.
One of the limiting factors to sperm production is size of the stallions testicles. The testicles of young stallions have not fully developed. As a result, they are not yet able to produce sperm in the quantity per day that they will when they are a fully developed stallion. Less available sperm production equates to fewer ejaculations in order to maintain the normal fertility of 3,000,000,000 sperm per ejaculation.