* UNFORGETTABLE MICHAEL *

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 더 많이 flowers.

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

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