The greenest my thumb has ever been

In May, when we were planting the entire yard, I experimented and put in 6 Dahlia bulbs and 50 Gladiola bulbs in shades of pink. I was hoping for big things, but since my green thumb has a tendency to be brown sometimes, I wasn't sure if they would sprout or not. Well about 40 of them came up immediately much to my suprise. Just this last week we had our first blooms. They are so perfectly beautiful and I am sure it had nothing to do with me. But now how do I take care of them and made them last another 3 weeks? Me and my thumb need to go type a search into Google.