twig vs branchlet vs sprig vs branch

Temat przeniesiony do archwium.
Hi,
Do you know what is the main difference between those three words in Polish :
twig vs branchlet vs spring vs branch

I've found the following explaination but this is still unclear for me in what context I can use each of those words:
"The current or most recent woody growth, forming the ends of a stem, is the twig.
The previous season's growth (last year's twig) is the branchlet, sometimes called a 2nd-year stem.
The branch is 3 years or more in age."
(taken from that place: http://www.namethatplant.net/glossary_twigs.shtml)

Thank you for any help
foxrafi

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