BLACK TULIP

THIS BLACK TULIP IS PROBABLY MY MOST FAVORITE FLOWER IN THE GARDEN. BUT I'M SLIGHTLY DISAPPOINTING IN THERE DEVELOPMENT THIS YEAR. I'VE THEM FIVE YEARS NOW SO MAYBE THEY ARE SPENT. SOME PEOPLE SAY TAKE THEM UP EACH YEAR. HAS ANY BLIPPERS OUT THERE GOT ANY IDEAS ON HOW TO IMPROVE MY FAVORITE TULIPS.