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).
Fall is the ideal time to plant Stargazer lilies in the ground. This gives the bulbs time to put down roots before winter sets in. This is also an excellent time to divide and transplant any established lilies you have in your garden. New bulbs should be planted as soon as possible after buying them. Try to plant in early fall when the weather is still pleasant and before heavy rains make your soil too wet to work.