see: numerous meanings, often sexual, it depends on the kind of flowers
fresh: good health
beautiful: the success
fragrant: a lot of good
pick: a warning against loss, rich harvest
break and throw: missed happiness
A dream that you plait a wreath of flowers is usually good for everyone, if only these are flowers growing in the same season of the year, in which the dreamer really is. Otherwise, that dream may bodes bad.