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).
Hereâs the short answer: Plant trees when they have enough time to establish roots before theyâre exposed to stressors like high heat, low temperatures, or not enough water. Nicholas Staddon of Monrovia, a plant seller, says late summer/early fall is the best time to plant in most parts of the U.S. â zones 4 to 8. âDuring the winter months in many parts of the U.S., roots are still active,â Staddon says. âThe tree starts to acclimatize itself to your soil.