"The canker galls the infants of the spring too oft before their buttons be disclosed, and, in the morn and liquid dew of youth, contagious blastments are most imminent."
Laertes is smart maybe a little overprotective of Ophelia he is very cautious has a close eye for Hamlet coming on to his sister.. i think that he will probably make somethings complicated for Hamlets plans on revenge.
Is Laertes overprotective? or is he somehow connected to the murder of Hamlets father and wants her to stay away from him because of it..?
The canker... spring: the canker worms destroys the early springs blossoms. meaning.. maybe saying untruthful things to put a false idea into someones head to get something you want out of them.