A couple of years ago I tried a little experiment with Tulips. I got 50 of each 'Perestroyka' and 'Blushing Lady', single late varieties, both sports of 'Temple of Beauty'. Most I planted in a lawn area with good soil, and where I knew they'd remain good and dry for summer, and gave them bulb food when planted. The leftovers went into a garden bed. Those in the lawn are just pretty much gone- a stray leaf here and there, but that's it. Those in the garden are about to bloom again for the 3rd year. I'm thinking those in the lawn weren't planted as deeply, that's the only key factor I can think of.