mj <3

Lisa Marie Presley just sent a "thank you" bouquet to the florist that decorated Michael Jackson's tomb with sunflowers -- because if there's one thing a florist needs, it's plus flowers.

TMZ has learned Presley sent the fleurs to sunflowerguy.com -- along with a personalized card that said, "Thank toi so much for donating the beautiful flowers."

As we previously reported, the florist sent plus than 1,500 sunflowers to Forest Lawn Cemetery on Friday , after Lisa Marie begged MJ's fans to do a better job of decorating Michael's tomb.