I take it by 'Cherry Blossom' Oroz..that you mean ornamental cherry and not the sweet cherries that we eat.
Prunus Rosaceae....of which there are 430 species.
As has been said it really needs to know what the var is that you admire so much.
However it might be worth having a go at something that can be done on many of them.
Nothing gained ...nothing lost I guese.
You can indeed graft them but you will need a rootstock to do this. This is normaly Prunus avium.
You can try though taking heel cuttings . 3-4 inches long in July of half-ripened shoots . Insert the cuttings in equal parts peat and sand mix with some bottom heat if possable. ( 61-64 F.)
pot on when rooted to potting compost in 3in pots and cold frame to the following spring. Then plant out to nursery rows for a further year or two before putting into a permanent position.
Because you may not find out the name of your ones...take further cuttings in August and repeat the prosess as some of the species prefer the later date.
worth having a go ..??
An apple a day.....keeps me in work.