Re: How long does it take for an earthworm to regenerate?

This question was much harder to answer than I had anticipated!  I did find 
some interesting facts, including the existence of Worm Digest, apparently 
a magazine devoted to worm raising.  At last, I was able to find this 
nugget of information: Worms have limited powers of regeneration. At their 
head end they may lose up to 10 segments, and a new head will grow back 
within a month. http://www.sunnom.com.au/growers/Spare%20page%201.htm



I found this interesting information at  http://newton.dep.anl.gov/natbltn/700-799/nb751.htm

The common earthworm or nightcrawler of our lawns, gardens and 
bait cans, has a body made up of a series of 100 or more segments 
marked off by shallow grooves. If the worm is cut in half, the head end 
can grow a new tail. The tail end, if it lives at all, grows another tail 
instead of a head and eventually starves to death. If only 15 or 20 
segments of the head end are cut off, they are replaced by a new head 
with but five segments.

Hope this answers your question!

Your mad scientist,

S. Kohler