Here is a video of the engine. There are marks on the ball to make it's rotation easier to see. You will notice that at the start I hold the ping-pong ball in my hand very briefly so the liquid nitrogen will boil and start the rotation quickly.
They can be planted in the spring around your last frost date. Gladioli bloom about 90 days (three months) after they sprout in spring, so the bloom time really depends on when you plant them. In warm climates, where they stay in the ground year-round, gladioli bloom anytime from late spring (deep South) to midsummer (middle South).
In order to enjoy the beauty of gladiolus flowers year after year, most gardeners must store their gladiolus corms (sometimes also referred to as gladiolas bulbs) in the winter. Gladiolus bulbs, or corms, arenât hardy through frozen winter months, so you must dig them up and store them until spring if you want to grow them again the next year.