Choose Best Flowers Worldwide for the ultimate springtime favorite: tulips! Order tulips for delivery in Knoxville, TN. Tulips are phototrophic, meaning they grow towards the light. They are also one of the few cut flowers that continue to grow even after being cut from the bulb! They can grow up to an inch a day! Tulips are available in a wide variety of colors including pink tulips, orange tulips, white tulips, yellow tulips, and sometimes purple tulips. They're available for same day flower delivery and next day flower delivery all spring long.