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).
Spring time is the best time for planting vegetables, the weather is perfect for the growth, after a few months your spring vegetable garden will be full of delicious vegetables. One of the best spring gardening tips is to plant 2 to 4 weeks after the last frost, when the soil is moist and ready. What vegetables to plant in spring? Well, there is a variety; however, below mentioned are top ten vegetables to plant in the spring: